Si4736-37-38-39-B20 Data Sheet – Not Recommended for New Designs – Please Use Si4736-37-38-39-C40

Si4736-37-38-39-B20 Data Sheet – Not Recommended for New Designs – Please Use Si4736-37-38-39-C40
Si4736/37/38/39-B20
B ROADCAST W EATHER BAND R ADIO R ECEIVER
Features
 NOAA weather band support (162.4–  No manual alignment necessary
162.55 MHz)
 Programmable reference clock






only)
 Optional digital audio output (Si47/39





only)
Optional digital audio output
(Si4737/39 only)
2-wire and 3-wire control interface
2.7 to 5.5 V supply voltage
Firmware upgradeable
3 x 3 x 0.55 mm 20-pin QFN package
 Pb-free/RoHS compliant
Ordering Information:
See page 30.
Pin Assignments
Si4736/37/38/39-GM
(Top View)
DFS

 RDS/RBDS processor (Si4737/39
GPO3/DCLK

 Programmable de-emphasis
GPO2/INT

 Programmable soft mute control
GPO1

(76–108 MHz)
Worldwide AM band support
(520–1710 kHz) (Si4736/37 only)
1050 Hz alert tone detection
Excellent real-world performance
Freq synthesizer with integrated VCO
Advanced AM/FM seek tuning
Automatic frequency control (AFC)
Automatic gain control (AGC)
Integrated LDO regulator
Digital FM stereo decoder
Adaptive noise suppression
AM/FM/WB digital tuning
NC

 Volume control
N
ot
Pl Re
ea c
se om
us me
e nd
Si e
47 d
36 for
/3 N
7/ ew
38 D
/3 e
9- sig
C n
40 s
 Worldwide FM band support
20
19
18
17
16
Applications
Emergency radios
Table and portable radios
 Stereos
 Mini/micro systems
 Portable media players
Boom boxes
Cellular handsets
 Modules
 Clock radios
 Mini HiFi


NC
FMI 2
RFGND 3
Si473x
AMI
LNA
AGC
LOW-IF
ADC
2.7– 5.5 V
VDD
LDO
AFC
RCLK
GND
Rev. 1.0 4/08
DOUT
DFS
GPO/DCLK
DAC
ROUT
DAC
LOUT
CONTROL
INTERFACE
SEN
AGC
9
10
VIO
14 LOUT
13 ROUT
12 GND
11 VDD
Patents pending
DSP
ADC
8
15 DOUT
VIO
1.5–3.6 V
Notes:
1. To ensure proper operation and
receiver performance, follow the
guidelines in “AN383: Universal
Antenna Selection and Layout
Guidelines.” Silicon Laboratories will
evaluate schematics and layouts for
qualified customers.
2. Place Si4736/37/38/39 as close as
possible to antenna jack and keep
the FMI and AMI traces as short as
possible.
RST
LNA
SCLK
FMI
DIGITAL
AUDIO
(Si4737/
39)
SDIO
RFGND
RDS
(Si4737/
39)
7
RCLK
Functional Block Diagram
6
SDIO
RST 5
The Si4736/37/38/39 is the first digital CMOS AM/FM/WB radio receiver IC that
integrates the complete tuner function from antenna input to audio output.
FM/
WB
ANT
GND
PAD
AMI 4
Description
AM
ANT
1
SCLK

SEN

Copyright © 2008 by Silicon Laboratories
Si4736/37/38/39-B20
Si4736/37/38/39-B20
2
Rev. 1.0
Si4736/37/38/39-B20
TABLE O F C ONTENTS
Section
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2. Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3. FM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.4. AM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.5. SW Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6. LW Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.7. Digital Audio Interface (Si4735 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.8. Stereo Audio Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.9. De-emphasis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.10. Stereo DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.11. Soft Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.12. RDS/RBDS Processor (Si4735 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.13. Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.14. Seek . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.15. Reference Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.16. Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.17. GPO Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.18. Firmware Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
4.19. Reset, Power Up, and Power Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.20. Programming with Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5. Commands and Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6. Pin Descriptions: Si4734/35-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8. Package Markings (Top Marks) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.1. Si4734/35 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.2. Top Mark Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
9. Package Outline: Si4734/35 QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10. PCB Land Pattern: Si4734/35 QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
11. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Rev. 1.0
3
Si4736/37/38/39-B20
1. Electrical Specifications
Table 1. Recommended Operating Conditions
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Supply Voltage
VDD
2.7
—
5.5
V
Interface Supply Voltage
VIO
1.5
—
3.6
V
Power Supply Power-Up Rise Time
VDDRISE
10
—
—
µs
Interface Power Supply Power-Up Rise Time
VIORISE
10
—
—
µs
TA
–20
25
85
C
Ambient Temperature
Note: All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions.
Typical values apply at VDD = 3.3 V and 25 C unless otherwise stated. Parameters are tested in production unless
otherwise stated.
Table 2. Absolute Maximum Ratings1,2
Parameter
Symbol
Value
Unit
Supply Voltage
VDD
–0.5 to 5.8
V
Interface Supply Voltage
VIO
–0.5 to 3.9
V
3
Input Current
IIN
10
mA
Input Voltage3
VIN
–0.3 to (VIO + 0.3)
V
Operating Temperature
TOP
–40 to 95
C
Storage Temperature
TSTG
–55 to 150
C
0.4
VpK
RF Input Level
4
Notes:
1. Permanent device damage may occur if the above Absolute Maximum Ratings are exceeded. Functional operation
should be restricted to the conditions as specified in the operational sections of this data sheet. Exposure beyond
recommended operating conditions for extended periods may affect device reliability.
2. The Si4736/37/38/39 devices are high-performance RF integrated circuits with certain pins having an ESD rating of
< 2 kV HBM. Handling and assembly of these devices should only be done at ESD-protected workstations.
3. For input pins SCLK, SEN, SDIO, RST, RCLK, DCLK, DFS, GPO1, GPO2, and GPO3.
4. At RF input pins, FMI and AMI.
4
Rev. 1.0
Si4736/37/38/39-B20
Table 3. DC Characteristics
(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
—
19.2
22
mA
—
19.8
23
mA
—
19.9
23
mA
—
18.0
20.5
mA
—
19.2
22
mA
—
19.8
23
mA
—
17.2
20.5
mA
FM Mode
Supply Current
Supply Current
IFM
1
IFM
RDS Supply Current2
Supply Current
2
Low SNR level
IFM
IFMD
Digital Output Mode
WB Mode
Supply Current
IFM
Supply Current
IFM
Supply Current
IFMD
Low SNR level
AM Mode
Supply Current
Supply Current
2
IAM
Analog Output Mode
—
17.3
20.5
mA
IAMD
Digital Output Mode
—
15.5
20.5
mA
Supplies and Interface
Interface Supply Current
IIO
—
320
600
µA
VDD Powerdown Current
IDDPD
—
10
20
µA
VIO Powerdown Current
IIOPD
—
1
10
µA
SCLK, RCLK inactive
High Level Input Voltage3
VIH
0.7 x VIO
—
VIO + 0.3
V
Voltage3
VIL
–0.3
—
0.3 x VIO
V
High Level Input Current3
IIH
VIN = VIO = 3.6 V
–10
—
10
µA
Current3
IIL
VIN = 0 V,
VIO = 3.6 V
–10
—
10
µA
High Level Output Voltage4
VOH
IOUT = 500 µA
0.8 x VIO
—
—
V
Voltage4
VOL
IOUT = –500 µA
—
—
0.2 x VIO
V
Low Level Input
Low Level Input
Low Level Output
Notes:
1. LNA is automatically switched to higher current mode for optimum sensitivity in weak signal conditions.
2. Specifications are guaranteed by characterization.
3. For input pins SCLK, SEN, SDIO, RST, RCLK, DCLK, and DFS.
4. For output pins SDIO, DOUT, GPO1, GPO2, and GPO3.
Rev. 1.0
5
Si4736/37/38/39-B20
Table 4. Reset Timing Characteristics1,2,3
(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)
Parameter
Symbol
Min
Typ
Max
Unit
RST Pulse Width and GPO1, GPO2/INT Setup to RST
tSRST
100
—
—
µs
GPO1, GPO2/INT Hold from RST
tHRST
30
—
—
ns
Important Notes:
1. When selecting 2-wire mode, the user must ensure that a 2-wire start condition (falling edge of SDIO while SCLK is
high) does not occur within 300 ns before the rising edge of RST.
2. When selecting 2-wire mode, the user must ensure that SCLK is high during the rising edge of RST, and stays high until
after the first start condition.
3. When selecting 3-wire or SPI modes, the user must ensure that a rising edge of SCLK does not occur within 300 ns
before the rising edge of RST.
4. If GPO1 and GPO2 are actively driven by the user, then minimum tSRST is only 30 ns. If GPO1 or GPO2 is hi-Z, then
minimum tSRST is 100 µs, to provide time for on-chip 1 M devices (active while RST is low) to pull GPO1 high and
GPO2 low.
tSRST
RST
tHRST
70%
30%
GPO1
70%
GPO2/
INT
70%
30%
30%
Figure 1. Reset Timing Parameters for Busmode Select
6
Rev. 1.0
Si4736/37/38/39-B20
Table 5. 2-Wire Control Interface Characteristics1,2,3
(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
SCLK Frequency
fSCL
0
—
400
kHz
SCLK Low Time
tLOW
1.3
—
—
µs
SCLK High Time
tHIGH
0.6
—
—
µs
SCLK Input to SDIO  Setup
(START)
tSU:STA
0.6
—
—
µs
SCLK Input to SDIO  Hold
(START)
tHD:STA
0.6
—
—
µs
SDIO Input to SCLK  Setup
tSU:DAT
100
—
—
ns
SDIO Input to SCLK  Hold4,5
tHD:DAT
0
—
900
ns
SCLK input to SDIO  Setup
(STOP)
tSU:STO
0.6
—
—
µs
STOP to START Time
tBUF
1.3
—
—
µs
SDIO Output Fall Time
tf:OUT
—
250
ns
—
300
ns
Cb
20 + 0.1 ----------1pF
SDIO Input, SCLK Rise/Fall Time
tf:IN
tr:IN
Cb
20 + 0.1 ----------1pF
SCLK, SDIO Capacitive Loading
Cb
—
—
50
pF
Input Filter Pulse Suppression
tSP
—
—
50
ns
Notes:
1. When VIO = 0 V, SCLK and SDIO are low impedance.
2. When selecting 2-wire mode, the user must ensure that a 2-wire start condition (falling edge of SDIO while SCLK is
high) does not occur within 300 ns before the rising edge of RST.
3. When selecting 2-wire mode, the user must ensure that SCLK is high during the rising edge of RST, and stays high
until after the first start condition.
4. The Si4736/37/38/39 delays SDIO by a minimum of 300 ns from the VIH threshold of SCLK to comply with the
minimum tHD:DAT specification.
5. The maximum tHD:DAT has only to be met when fSCL = 400 kHz. At frequencies below 400 kHz, tHD:DAT may be violated
as long as all other timing parameters are met.
Rev. 1.0
7
Si4736/37/38/39-B20
SCLK
SDIO
tSU:STA tHD:STA
tLOW
START
tr:IN
tHIGH
tr:IN
tf:IN
tSP
tSU:STO
tBUF
70%
30%
70%
30%
tf:IN,
tf:OUT
tHD:DAT tSU:DAT
STOP
START
Figure 2. 2-Wire Control Interface Read and Write Timing Parameters
SCLK
A6-A0,
R/W
SDIO
START
ADDRESS + R/W
D7-D0
ACK
DATA
D7-D0
ACK
DATA
ACK
Figure 3. 2-Wire Control Interface Read and Write Timing Diagram
8
Rev. 1.0
STOP
Si4736/37/38/39-B20
Table 6. 3-Wire Control Interface Characteristics
(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
SCLK Frequency
fCLK
0
—
2.5
MHz
SCLK High Time
tHIGH
25
—
—
ns
SCLK Low Time
tLOW
25
—
—
ns
tS
20
—
—
ns
SDIO Input to SCLKHold
tHSDIO
10
—
—
ns
SEN Input to SCLKHold
tHSEN
10
—
—
ns
SCLKto SDIO Output Valid
tCDV
Read
2
—
25
ns
SCLKto SDIO Output High Z
tCDZ
Read
2
—
25
ns
SCLK, SEN, SDIO, Rise/Fall time
tR, tF
—
—
10
ns
SDIO Input, SEN to SCLKSetup
Note: When selecting 3-wire mode, the user must ensure that a rising edge of SCLK does not occur within 300 ns before the
rising edge of RST.
SCLK
70%
30%
tS
SEN
SDIO
tR
tF
70%
tHSDIO
tHIGH
tLOW
tHSEN
tS
30%
70%
30%
A7
A6-A5,
R/W,
A4-A1
A0
D15
D14-D1
Address In
D0
Data In
Figure 4. 3-Wire Control Interface Write Timing Parameters
SCLK
70%
30%
tHSDIO
tS
SEN
70%
tCDV
tHSEN
tCDZ
tS
30%
70%
SDIO
A7
30%
A6-A5,
R/W,
A4-A1
Address In
A0
D15
½ Cycle Bus
Turnaround
D14-D1
D0
Data Out
Figure 5. 3-Wire Control Interface Read Timing Parameters
Rev. 1.0
9
Si4736/37/38/39-B20
Table 7. SPI Control Interface Characteristics
(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
SCLK Frequency
fCLK
0
—
2.5
MHz
SCLK High Time
tHIGH
25
—
—
ns
SCLK Low Time
tLOW
25
—
—
ns
tS
15
—
—
ns
SDIO Input to SCLKHold
tHSDIO
10
—
—
ns
SEN Input to SCLKHold
tHSEN
5
—
—
ns
SCLKto SDIO Output Valid
tCDV
Read
2
—
25
ns
SCLKto SDIO Output High Z
tCDZ
Read
2
—
25
ns
SCLK, SEN, SDIO, Rise/Fall time
tR, tF
—
—
10
ns
SDIO Input, SEN to SCLKSetup
Note: When selecting SPI mode, the user must ensure that a rising edge of SCLK does not occur within 300 ns before the
rising edge of RST.
SCLK
70%
30%
tHIGH
SEN
SDIO
tLOW
tHSDIO
tR
tF
tHSEN
70%
30%
70%
30%
tS
tS
C7
C6–C1
C0
D7
Control Byte In
D6–D1
D0
8 Data Bytes In
Figure 6. SPI Control Interface Write Timing Parameters
SCLK
70%
30%
tCDV
tS
SEN
70%
tHSEN
tHSDIO
tS
30%
tCDZ
SDIO
70%
C7
C6–C1
C0
D7
D6–D1
D0
30%
Control Byte In
Bus
Turnaround
16 Data Bytes Out
(SDIO or GPO1)
Figure 7. SPI Control Interface Read Timing Parameters
10
Rev. 1.0
Si4736/37/38/39-B20
Table 8. Digital Audio Interface Characteristics
(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)
Parameter
Symbol Test Condition
Min
Typ
Max
Unit
DCLK Cycle Time
tDCT
26
—
1000
ns
DCLK Pulse Width High
tDCH
10
—
—
ns
DCLK Pulse Width Low
tDCL
10
—
—
ns
DFS Set-up Time to DCLK Rising Edge
tSU:DFS
5
—
—
ns
DFS Hold Time from DCLK Rising Edge
tHD:DFS
5
—
—
ns
tPD:DOUT
0
—
12
ns
DOUT Propagation Delay from DCLK Falling
Edge
tDCH
tDCL
DCLK
tDCT
DFS
tHD:DFS
tSU:DFS
DOUT
tPD:OUT
Figure 8. Digital Audio Interface Timing Parameters, I2S Mode
Rev. 1.0
11
Si4736/37/38/39-B20
Table 9. FM Receiver Characteristics1,2
(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)
Parameter
Symbol
Input Frequency
Test Condition
fRF
Min
Typ
Max
Unit
76
—
108
MHz
Sensitivity with Headphone Network3,4,5
(S+N)/N = 26 dB
—
2.2
3.5
µV EMF
Sensitivity with 50  Network3,4,5,6
(S+N)/N = 26 dB
—
1.1
—
µV EMF
RDS Sensitivity6
f = 2 kHz,
RDS BLER < 5%
—
15
—
µV EMF
3
4
5
k
4
5
6
pF
100
105
—
dBµV EMF
m = 0.3
40
50
—
dB
Adjacent Channel Selectivity
±200 kHz
35
50
—
dB
Alternate Channel Selectivity
±400 kHz
60
70
—
dB
In-band
35
—
—
dB
72
80
90
mVRMS
—
—
1
dB
LNA Input Resistance6,7
6,7
LNA Input Capacitance
Input
IP36,8
AM Suppression3,4,6,7
Spurious Response Rejection6
Audio Output Voltage3,4,7
3,7,9
Audio Output L/R Imbalance
Low6
–3 dB
—
—
30
Hz
Audio Frequency Response High6
–3 dB
15
—
—
kHz
25
—
—
dB
55
63
—
dB
—
58
—
dB
—
0.1
0.5
%
FM_DEEMPHASIS = 2
70
75
80
µs
FM_DEEMPHASIS = 1
45
50
54
µs
RL
Single-ended
10
—
—
k
CL
Single-ended
—
—
50
pF
Audio Frequency Response
Audio Stereo Separation7,9
Audio Mono S/N
3,4,5,7,10
Audio Stereo S/N
4,5,7,10,11
Audio THD3,7,9
De-emphasis Time Constant6
Audio Output Load
Resistance6,10
Audio Output Load Capacitance6,10
Notes:
1. Additional testing information is available in Application Note AN388. Volume = maximum for all tests. Tested at
RF = 98.1 MHz.
2. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and
Universal Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers.
3. FMOD = 1 kHz, 75 µs de-emphasis, MONO = enabled, and L = R unless noted otherwise.
4. f = 22.5 kHz.
5. BAF = 300 Hz to 15 kHz, A-weighted.
6. Guaranteed by characterization.
7. VEMF = 1 mV.
8. |f2 – f1| > 2 MHz, f0 = 2 x f1 – f2. AGC is disabled. Refer to "6. Pin Descriptions: Si4736/37/38/39-GM" on page 29.
9. f = 75 kHz.
10. At LOUT and ROUT pins.
11. Analog audio output mode.
12. At temperature (25 °C).
12
Rev. 1.0
Si4736/37/38/39-B20
Table 9. FM Receiver Characteristics1,2 (Continued)
(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)
Parameter
Symbol
Seek/Tune Time6
Powerup Time6
12
RSSI Offset
Test Condition
Min
Typ
Max
Unit
RCLK tolerance
= 100 ppm
—
—
80
ms/channel
From powerdown
—
—
110
ms
Input levels of 8 and
60 dBµV at RF Input
–3
—
3
dB
Notes:
1. Additional testing information is available in Application Note AN388. Volume = maximum for all tests. Tested at
RF = 98.1 MHz.
2. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and
Universal Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers.
3. FMOD = 1 kHz, 75 µs de-emphasis, MONO = enabled, and L = R unless noted otherwise.
4. f = 22.5 kHz.
5. BAF = 300 Hz to 15 kHz, A-weighted.
6. Guaranteed by characterization.
7. VEMF = 1 mV.
8. |f2 – f1| > 2 MHz, f0 = 2 x f1 – f2. AGC is disabled. Refer to "6. Pin Descriptions: Si4736/37/38/39-GM" on page 29.
9. f = 75 kHz.
10. At LOUT and ROUT pins.
11. Analog audio output mode.
12. At temperature (25 °C).
Table 10. WB Receiver Characteristics1
(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6V, TA = 25 °C)
Parameter
Min
Typ
Max
Unit
162.4
—
162.55
MHz
SINAD = 12 dB
—
0.9
—
µV EMF
+/-25 kHz
—
52
—
dB
Audio S/N2,3,4,5
Mono
—
45
—
dB
Audio Frequency Response Low6
–3 dB
—
—
300
Hz
Audio Frequency Response High6
–3 dB
3
—
—
kHz
Input Frequency
Sensitivity2,3
Adjacent Channel Selectivity
Symbol
Test Condition
fR
Notes:
1. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Universal Antenna Selection
and Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers.
2. FMOD = 1 kHz.
3. f = 3 kHz.
4. VEMF = 1 mV.
5. A-weighted.
6. Guaranteed by characterization
Rev. 1.0
13
Si4736/37/38/39-B20
Table 11. AM Receiver Characteristics1
(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)
Parameter
Input Frequency
Sensitivity
Symbol
Test Condition
Min
Typ
Max
Unit
520
—
1710
kHz
(S+N)/N = 26 dB
—
25
35
µV EMF
THD < 8%
—
300
—
mVRMS
∆VDD = 100 mVRMS, 100 Hz
—
40
—
dB
54
60
67
mVRMS
50
56
—
dB
—
0.1
0.5
%
180
—
450
µH
—
—
110
ms
fRF
2,3,4,5, 6
Large Signal Voltage Handling5,7
Power Supply Rejection Ratio
Audio Output Voltage2,8
Audio S/N
2,3,4,6,8
Audio THD2,4,8
5,9
Antenna Inductance
Powerup Time
From powerdown
Notes:
1. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and
Universal Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers.
2. FMOD = 1 kHz, 30% modulation, A-weighted, 2 kHz channel filter.
3. BAF = 300 Hz to 15 kHz, A-weighted.
4. fRF = 1000 kHz, f = 10 kHz.
5. Guaranteed by characterization.
6. Analog audio output mode.
7. See “AN388: Evaluation Board Test Procedure” for evaluation method.
8. VIN = 5 mVrms.
9. Stray capacitance on antenna and board must be < 10 pF to achieve full tuning range at higher inductance levels.
14
Rev. 1.0
Si4736/37/38/39-B20
Table 12. Reference Clock and Crystal Characteristics
(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
31.130
32.768
40000.0
kHz
–50
—
50
ppm
1
—
4095
31.130
32.768
34.406
kHz
Crystal Oscillator Frequency
—
32.768
—
kHz
Crystal Frequency Tolerance*
–100
—
100
ppm
—
—
3.5
pF
Reference Clock
RCLK Supported Frequencies*
RCLK Frequency Tolerance
REFCLK_PRESCALE
REFCLK
Crystal Oscillator
Board Capacitance
*Note: The Si4736/37/38/39 divides the RCLK input by REFCLK_PRESCALE to obtain REFCLK. There are some RCLK
frequencies between 31.130 kHz and 40 MHz that are not supported. See AN332, Table 6 for more details.
15
Rev. 1.0
Si4736/37/38/39-B20
2. Typical Application Schematic
GPO1
GPO2/INT
R1
R2
GPO3/DCLK
2 FMI
3 RFGND
FMIP
L1
AM antenna
C5
4 AMI
5
GPO3/DCLK
DFS
NC
GPO2/INT
1
GPO1
NC
20
19
18
17
16
DFS
U1
Si473x
DOUT
15
R3
DOUT
Optional: Digital Audio Output
14
13
ROUT/DOUT
12
LOUT/DFS
GND
VDD
RST
LOUT
ROUT
11
VBATTERY
2.7 to 5.5 V
C1
RST
6
7
8
9
10
SEN
SCLK
SDIO
RCLK
VIO
Si4736/37 only
X1
GPO3
SEN
SCLK
SDIO
RCLK
VIO
1.5 to 3.6 V
C2
RCLK
C3
Optional: for crystal oscillator option
L2
RFGND
AMI
T1
C5
Optional: AM air loop antenna
Notes:
1. Place C1 close to VDD pin.
2. All grounds connect directly to GND plane on PCB.
3. Pins 1 and 20 are no connects, leave floating.
4. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Universal Antenna Selection and
Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers.
5. Pin 2 connects to the FM antenna interface, and pin 4 connects to the AM antenna interface.
6. RFGND should be locally isolated from GND.
7. Place Si4736/37/38/39 as close as possible to antenna jack and keep the FMI and AMI traces as short as possible.
16
Rev. 1.0
Si4736/37/38/39-B20
3. Bill of Materials
Component(s)
Value/Description
Supplier
C1
Supply bypass capacitor, 22 nF, ±20%, Z5U/X7R
Murata
C5
Coupling capacitor, 0.47 µF, ±20%, Z5U/X7R
Murata
L1
Ferrite loop stick, 180–450 µH
Jiaxin
U1
Si4736/37/38/39 AM/FM/WB Radio Tuner
Silicon Laboratories
Optional Components
T1
Transformer, 1–5 turns ratio
Jiaxin, UMEC
L2
Air loop antenna, 10–20 µH
Various
Crystal load capacitors, 22 pF, ±5%, COG
(Optional: for crystal oscillator option)
Venkel
X1
32.768 kHz crystal (Optional: for crystal oscillator option)
Epson
R1
Resistor, 2 k(Optional: for digital audio)
Venkel
R2
Resistor, 2 k(Optional: for digital audio)
Venkel
R3
Resistor, 600 (Optional: for digital audio)
Venkel
C2, C3
Rev. 1.0
17
Si4736/37/38/39-B20
4. Functional Description
4.1. Overview
Si473x
AMI
RDS
(Si4737/
39)
AGC
LOW-IF
GPO/DCLK
ROUT
DAC
LOUT
DSP
ADC
VDD
LDO
AFC
RCLK
GND
DFS
CONTROL
INTERFACE
VIO
1.5–3.6 V
RST
LNA
DOUT
DAC
SDIO
FMI
AGC
2.7– 5.5 V
DIGITAL
AUDIO
(Si4737/
39)
ADC
SCLK
FM/
WB
ANT
RFGND
LNA
SEN
AM
ANT
Figure 9. Functional Block Diagram
The Si4736/37 and Si4738/39 are the industry's first
fully integrated, 100% CMOS AM/FM/WB and FM/WB
radio receiver ICs. Offering unmatched integration and
PCB space savings, the Si4736/37/38/39 requires only
two external components and less than 15 mm2 of
board area, excluding the antenna inputs. The
Si4736/37/38/39 AM/FM/WB radio provides the space
savings and low power consumption necessary for
portable devices while delivering the high performance
and design simplicity desired for all AM/FM/WB
solutions.
Leveraging Silicon Laboratories' proven and patented
Si4700/01 FM tuner's digital low intermediate frequency
(low-IF) receiver architecture, the Si4736/37/38/39
delivers superior RF performance and interference
rejection in both AM and FM bands. The high integration
and complete system production test simplifies designin, increases system quality, and improves
manufacturability.
wire control interface, SPI, and a Si4700/01 backwardscompatible, 3-wire control interface.
The Si4736/37/38/39 utilizes digital processing to
achieve high fidelity, optimal performance, and design
flexibility. The chip provides excellent pilot rejection,
selectivity, and unmatched audio performance, and
offers both the manufacturer and the end-user
extensive programmability and flexibility in listening
experience.
The Si4737/39 incorporates a digital processor for the
European Radio Data System (RDS) and the North
American Radio Broadcast Data System (RBDS), and
includes all required symbol decoding, block
synchronization, error detection, and error correction
functions. Using this feature, the Si4737/39 enables
broadcast data such as station identification and song
name to be displayed to the user.
The Si4736/37/38/39 is a feature-rich solution including
1050 Hz tone detection, advanced seek algorithms, soft
mute, auto-calibrated digital tuning, and FM stereo
processing. In addition, the Si4736/37/38/39 provides
analog and digital audio outputs and a programmable
reference clock. The device supports I2C-compatible, 2-
18
Rev. 1.0
Si4736/37/38/39-B20
4.2. Operating Modes
4.4. AM Receiver (Si4736/37)
The Si4736/37/38/39 operates in an FM receive, an AM
receive, or a weather band receive mode. In FM mode
and WB mode, radio signals are received on FMI (pin 2)
and processed by the FM front-end circuitry. In AM
mode, radio signals are received on AMI (pin 4) and
processed by the AM front-end circuitry. In addition to
the receiver mode, there is a clocking mode to choose
to clock the Si473x from a reference clock or crystal. On
the Si4737/39, there is an audio output mode to choose
between an analog and/or digital audio output. In the
analog audio output mode, pin 13 is ROUT, pin 14 is
LOUT, and pin 17 is GPO3. In the digital audio mode,
pin 15 is DOUT, pin 16 is DFS, and pin 17 is DCLK.
Concurrent analog/digital audio output mode requires
pins 13, 14, 15, 16, and 17. The receiver mode and the
audio output mode are set by the POWER_UP
command listed in Table 12. Si473x Command
Summary.
The highly integrated Si4736/37 supports worldwide AM
band reception from 520 to 1710 kHz using a digital
low-IF architecture with a minimum number of external
components and no manual alignment required. This
digital low-IF architecture allows for high-precision
filtering and offers excellent selectivity and noise
suppression. The DSP also provides 9 or 10 kHz
channel selection, AM demodulation, soft mute, and
additional features such as adjustable channel
bandwidth settings. Similar to the FM receiver, the
integrated LNA and AGC optimize sensitivity and
rejection of strong interferers allowing better reception
of weak stations.
4.3. FM Receiver
The Si4736/37/38/39 FM receiver is based on the
proven Si4700/01 FM tuner. The receiver uses a digital
low-IF architecture, allowing the elimination of external
components
and
factory
adjustments.
The
Si4736/37/38/39 integrates a low noise amplifier (LNA)
supporting the worldwide FM broadcast band (76 to 108
MHz). An AGC circuit controls the gain of the LNA to
optimize sensitivity and rejection of strong interferers.
For testing purposes, the AGC can be disabled. Refer to
Section "5. Commands and Properties" on page 25 for
additional programming and configuration information.
An image-reject mixer downconverts the RF signal to
low-IF. The quadrature mixer output is amplified,
filtered, and digitized with high resolution analog-todigital converters (ADCs). This advanced architecture
allows the Si4736/37/38/39 to perform channel
selection, FM demodulation, and stereo audio
processing to achieve superior performance compared
to traditional analog architectures.
19
The Si4736/37 provides highly accurate digital AM
tuning without factory adjustments. To offer maximum
flexibility, the receiver supports a wide range of ferrite
loop sticks from 180–450 µH. An air loop antenna is
supported by using a transformer to increase the
effective inductance from the air loop. Using a 1:5 turn
ratio inductor, the inductance is increased by 25 times
and easily supports all typical AM air loop antennas,
which generally vary between 10 and 20 µH.
4.5. Weather Band Receiver
The Si4736/37/38/39 supports weather band reception
from 162.4 to 162.55 MHz. The highly integrated
Si4736/37/38/39 meets NOAA specification, receives all
seven NOAA specified frequencies, implements narrowband FM de-emphasis, and supports 1050 Hz alert tone
detection. In addition, the Si4736/37/38/39 provides
advanced features not available on conventional radios,
such as an AFC and a dynamic channel bandwidth filter.
The AFC locks on to the strongest signal within a
narrow, adjustable frequency range to compensate for
any potential frequency errors such as crystal tolerance
or transmit frequency errors. The AFC ensures the
channel filter is always centered on the desired channel
providing optimal reception. The dynamic channel
bandwidth feature utilizes a wide filter in strong signal
conditions to provide best sound quality and a narrower
filter in weak conditions to provide best sensitivity.
Rev. 1.0
Si4736/37/38/39-B20
4.6. Digital Audio Interface (Si4737/39
Only)
The digital audio interface operates in slave mode and
supports three different audio data formats:
I2S
 Left-Justified
 DSP Mode

4.6.1. Audio Data Formats
In I2S mode, by default the MSB is captured on the
second rising edge of DCLK following each DFS
transition. The remaining bits of the word are sent in
order, down to the LSB. The left channel is transferred
first when the DFS is low, and the right channel is
transferred when the DFS is high.
In Left-Justified mode, by default the MSB is captured
on the first rising edge of DCLK following each DFS
transition. The remaining bits of the word are sent in
order, down to the LSB. The left channel is transferred
first when the DFS is high, and the right channel is
transferred when the DFS is low.
(OFALL = 1)
INVERTED
DCLK
(OFALL = 0)
DCLK
I2S
(OMODE = 0000)
In DSP mode, the DFS becomes a pulse with a width of
1DCLK period. The left channel is transferred first,
followed right away by the right channel. There are two
options in transferring the digital audio data in DSP
mode: the MSB of the left channel can be transferred on
the first rising edge of DCLK following the DFS pulse or
on the second rising edge.
In all audio formats, depending on the word size, DCLK
frequency and sample rates, there may be unused
DCLK cycles after the LSB of each word before the next
DFS transition and MSB of the next word. In addition, if
preferred, the user can configure the MSB to be
captured on the falling edge of DCLK via properties.
The number of audio bits can be configured for 8, 16,
20, or 24 bits.
4.6.2. Audio Sample Rates
The device supports a number of industry-standard
sampling rates including 32, 40, 44.1, and 48 kHz. The
digital audio interface enables low-power operation by
eliminating the need for redundant DACs on the audio
baseband processor.
LEFT CHANNEL
DFS
RIGHT CHANNEL
1 DCLK
1 DCLK
1
DOUT
2
n-2
3
n-1
MSB
n
1
LSB
MSB
2
n-2
3
n-1
n
LSB
Figure 10. I2S Digital Audio Format
(OFALL = 1)
INVERTED
DCLK
(OFALL = 0)
DCLK
DFS
LEFT CHANNEL
RIGHT CHANNEL
Left-Justified
(OMODE = 0110)
1
DOUT
2
3
n-2
n-1
MSB
n
1
LSB
MSB
2
n-2
3
n-1
n
LSB
Figure 11. Left-Justified Digital Audio Format
DCLK
(OFALL = 0)
DFS
RIGHT CHANNEL
LEFT CHANNEL
(OMODE = 1100)
DOUT
(MSB at 1 rising edge)
1
st
2
3
n-2
n-1
MSB
(OMODE = 1000)
1
LSB
MSB
n-1
n
1
LSB
MSB
2
3
1
2
3
n-2
n-1
n
LSB
RIGHT CHANNEL
MSB
2
Figure 12. DSP Digital Audio Format
20
n-2
LEFT CHANNEL
1 DCLK
DOUT
(MSB at 2 rising edge)
nd
n
Rev. 1.0
3
n-2
n-1
n
LSB
Si4736/37/38/39-B20
4.8. De-emphasis
The output of the FM demodulator is a stereo
multiplexed (MPX) signal. The MPX standard was
developed in 1961, and is used worldwide. Today's
MPX signal format consists of left + right (L+R) audio,
left – right (L–R) audio, a 19 kHz pilot tone, and
RDS/RBDS data as shown in Figure 13 below.
Pre-emphasis and de-emphasis is a technique used by
FM broadcasters to improve the signal-to-noise ratio of
FM receivers by reducing the effects of high-frequency
interference and noise. When the FM signal is
transmitted, a pre-emphasis filter is applied to
accentuate the high audio frequencies. The
Si4736/37/38/39 incorporates a de-emphasis filter
which attenuates high frequencies to restore a flat
frequency response. Two time constants are used in
various regions. The de-emphasis time constant is
programmable to 50 or 75 µs and is set by the
FM_DEEMPHASIS property.
Modulation Level
4.7. Stereo Audio Processing
Mono Audio
Left + Right
Stereo
Pilot
Stereo Audio
Left - Right
RDS/
RBDS
4.9. Stereo DAC
0
15 19 23
38
53
57
Frequency (kHz)
Figure 13. MPX Signal Spectrum
High-fidelity stereo digital-to-analog converters (DACs)
drive analog audio signals onto the LOUT and ROUT
pins. The audio output may be muted. Volume is
adjusted digitally with the RX_VOLUME property.
4.7.1. Stereo Decoder
4.10. Soft Mute
The Si4736/37/38/39's integrated stereo decoder
automatically decodes the MPX signal using DSP
techniques. The 0 to 15 kHz (L+R) signal is the mono
output of the FM tuner. Stereo is generated from the
(L+R), (L–R), and a 19 kHz pilot tone. The pilot tone is
used as a reference to recover the (L–R) signal. Output
left and right channels are obtained by adding and
subtracting the (L+R) and (L–R) signals respectively.
The Si4737/39 uses frequency information from the
19 kHz stereo pilot to recover the 57 kHz RDS/RBDS
signal.
The soft mute feature is available to attenuate the audio
outputs and minimize audible noise in very weak signal
conditions. The softmute attenuation level is adjustable
using the FM_SOFT_MUTE_MAX_ATTENUATION and
AM_SOFT_MUTE_MAX_ATTENUATION properties.
4.7.2. Stereo-Mono Blending
Adaptive noise suppression is employed to gradually
combine the stereo left and right audio channels to a
mono (L+R) audio signal as the signal quality degrades
to maintain optimum sound fidelity under varying
reception conditions. Stereo/mono status can be
monitored with the FM_RSQ_STATUS command. Mono
operation
can
be
forced
with
the
FM_BLEND_MONO_THRESHOLD property.
4.11. RDS/RBDS Processor
(Si4737/39 Only)
The Si4737/39 implements an RDS/RBDS* processor
for symbol decoding, block synchronization, error
detection, and error correction.
The Si4737/39 device is user configurable and provides
an optional interrupt when RDS is synchronized, loses
synchronization, and/or the user configurable RDS
FIFO threshold has been met.
The Si4737/39 reports RDS decoder synchronization
status, and detailed bit errors in the information word for
each RDS block with the FM_RDS_STATUS command.
The range of reportable block errors is 0, 1–2, 3–5, or
6+. More than six errors indicates that the
corresponding block information word contains six or
more non-correctable errors, or that the block
checkword contains errors.
*Note: RDS/RBDS is referred to only as RDS throughout the
remainder of this document.
21
Rev. 1.0
Si4736/37/38/39-B20
4.12. Tuning
The frequency synthesizer uses Silicon Laboratories’
proven technology, including a completely integrated VCO.
The frequency synthesizer generates the quadrature local
oscillator signal used to downconvert the RF input to a low
intermediate frequency. The VCO frequency is locked to
the reference clock and adjusted with an AFC servo loop
during reception. The tuning frequency can be directly
programmed
using
the
WB_TUNE_FREQ,
FM_TUNE_FREQ, and AM_TUNE_FREQ commands.
The Si4736/37/38/39 supports channel spacing of 25 kHz
in WB mode; 50, 100, or 200 kHz in FM mode; and 9 or
10 kHz in AM mode.
4.13. Seek
Seek tuning will search up or down for a valid channel.
Valid channels are found when the receive signal
strength indicator (RSSI) and the signal-to-noise ratio
(SNR) values exceed the set threshold. Using the SNR
qualifier rather than solely relying on the more
traditional RSSI qualifier can reduce false stops and
increase the number of valid stations detected. Seek is
initiated
using
the
FM_SEEK_START
and
AM_SEEK_START commands. The RSSI and SNR
threshold settings are adjustable using properties (see
Table 15).
Two seek options are available. The device will either
wrap or stop at the band limits. If the seek operation is
unable to find a channel, the device will indicate failure
and return to the channel selected before the seek
operation began.
which may result in mistunes, false stops, and/or lower
SNR.
For best seek/tune results, Silicon Laboratories
recommends that all SDIO data traffic be suspended
during Si4736/37/38/39 seek and tune operations. This
is achieved by keeping the bus quiet for all other
devices on the bus, and delaying tuner polling until the
tune or seek operation is complete. The STC (seek/tune
complete) interrupt should be used instead of polling to
determine when a seek/tune operation is complete.
4.15. Control Interface
A serial port slave interface is provided, which allows an
external controller to send commands to the
Si4736/37/38/39 and receive responses from the
device. The serial port can operate in three bus modes:
2-wire mode, 3-wire mode, or SPI mode. The
Si4736/37/38/39 selects the bus mode by sampling the
state of the GPO1 and GPO2 pins on the rising edge of
RST. The GPO1 pin includes an internal pull-up resistor,
which is connected while RST is low, and the GPO2 pin
includes an internal pull-down resistor, which is
connected while RST is low. Therefore, it is only
necessary for the user to actively drive pins which differ
from these states. See Table 13.
Table 13. Bus Mode Select on Rising Edge of
RST
Seek is not available for weather band.
4.14. Reference Clock
The Si4736/37/38/39 reference clock is programmable,
supporting RCLK frequencies in Table 12. Refer to
Table 3, “DC Characteristics,” on page 5 for switching
voltage
levels
and
Table 9,
“FM
Receiver
Characteristics” on page 12 for frequency tolerance
information.
An onboard crystal oscillator is available to generate the
32.768 kHz reference when an external crystal and load
capacitors are provided. Refer to "2. Typical Application
Schematic" on page 16. This mode is enabled using the
POWER_UP command, see Table 14, “Si473x
Command Summary,” on page 25.
The Si4736/37/38/39 performance may be affected by
data activity on the SDIO bus when using the integrated
internal oscillator. SDIO activity results from polling the
tuner for status or communicating with other devices
that share the SDIO bus. If there is SDIO bus activity
while the Si4736/37/38/39 is performing the seek/tune
function, the crystal oscillator may experience jitter,
22
Bus Mode
GPO1
GPO2
2-Wire
1
0
SPI
1
1 (must drive)
3-Wire
0 (must drive)
0
After the rising edge of RST, the pins GPO1 and GPO2
are used as general purpose output (O) pins, as
described in Section “4.16. GPO Outputs”. In any bus
mode, commands may only be sent after VIO and VDD
supplies are applied.
In any bus mode, before sending a command or reading
a response, the user must first read the status byte to
ensure that the device is ready (CTS bit is high).
4.15.1. 2-Wire Control Interface Mode
When selecting 2-wire mode, the user must ensure that
SCLK is high during the rising edge of RST, and stays
high until after the first start condition. Also, a start
condition must not occur within 300 ns before the rising
edge of RST.
The 2-wire bus mode uses only the SCLK and SDIO
pins for signaling. A transaction begins with the START
condition, which occurs when SDIO falls while SCLK is
high. Next, the user drives an 8-bit control word serially
Rev. 1.0
Si4736/37/38/39-B20
on SDIO, which is captured by the device on rising
edges of SCLK. The control word consists of a 7-bit
device address, followed by a read/write bit (read = 1,
write = 0). The Si4736/37/38/39 acknowledges the
control word by driving SDIO low on the next falling
edge of SCLK.
the Si4736/37/38/39 will drive the 16-bit read data word
serially on SDIO, changing the state of SDIO on each
rising edge of SCLK.
Although the Si4736/37/38/39 will respond to only a
single device address, this address can be changed
with the SEN pin (note that the SEN pin is not used for
signaling in 2-wire mode). When SEN = 0, the 7-bit
device address is 0010001b. When SEN = 1, the
address is 1100011b.
In 3-wire mode, commands are sent by first writing each
argument to register(s) 0xA1–0xA3, then writing the
command word to register 0xA0. A response is
retrieved by reading registers 0xA8–0xAF.
For write operations, the user then sends an 8-bit data
byte on SDIO, which is captured by the device on rising
edges of SCLK. The Si4736/37/38/39 acknowledges
each data byte by driving SDIO low for one cycle, on the
next falling edge of SCLK. The user may write up to 8
data bytes in a single 2-wire transaction. The first byte is
a command, and the next seven bytes are arguments.
For read operations, after the Si4736/37/38/39 has
acknowledged the control byte, it will drive an 8-bit data
byte on SDIO, changing the state of SDIO on the falling
edge of SCLK. The user acknowledges each data byte
by driving SDIO low for one cycle, on the next falling
edge of SCLK. If a data byte is not acknowledged, the
transaction will end. The user may read up to 16 data
bytes in a single 2-wire transaction. These bytes contain
the response data from the Si4736/37/38/39.
A 2-wire transaction ends with the STOP condition,
which occurs when SDIO rises while SCLK is high.
For details on timing specifications and diagrams, refer
to Table 5, “2-Wire Control Interface Characteristics” on
page 7; Figure 2, “2-Wire Control Interface Read and
Write Timing Parameters,” on page 8, and Figure 3, “2Wire Control Interface Read and Write Timing Diagram,”
on page 8.
4.15.2. 3-Wire Control Interface Mode
When selecting 3-wire mode, the user must ensure that
a rising edge of SCLK does not occur within 300 ns
before the rising edge of RST.
The 3-wire bus mode uses the SCLK, SDIO, and SEN_
pins. A transaction begins when the user drives SEN
low. Next, the user drives a 9-bit control word on SDIO,
which is captured by the device on rising edges of
SCLK. The control word consists of a 9-bit device
address (A7:A5 = 101b), a read/write bit (read = 1, write
= 0), and a 5-bit register address (A4:A0).
For write operations, the control word is followed by a
16-bit data word, which is captured by the device on
rising edges of SCLK.
For read operations, the control word is followed by a
delay of one-half SCLK cycle for bus turn-around. Next,
23
A transaction ends when the user sets SEN high, then
pulses SCLK high and low one final time. SCLK may
either stop or continue to toggle while SEN is high.
For details on timing specifications and diagrams, refer
to Table 6, “3-Wire Control Interface Characteristics,” on
page 9; Figure 4, “3-Wire Control Interface Write Timing
Parameters,” on page 9, and Figure 5, “3-Wire Control
Interface Read Timing Parameters,” on page 9.
4.15.3. SPI Control Interface Mode
When selecting SPI mode, the user must ensure that a
rising edge of SCLK does not occur within 300 ns
before the rising edge of RST.
SPI bus mode uses the SCLK, SDIO, and SEN pins for
read/write operations. The system controller can
choose to receive read data from the device on either
SDIO or GPO1. A transaction begins when the system
controller drives SEN = 0. The system controller then
pulses SCLK eight times, while driving an 8-bit control
byte serially on SDIO. The device captures the data on
rising edges of SCLK. The control byte must have one
of five values:
0x48 = write a command (controller drives 8
additional bytes on SDIO).
 0x80 = read a response (device drives 1additional
byte on SDIO).
 0xC0 = read a response (device drives 16 additional
bytes on SDIO).
 0xA0 = read a response (device drives 1 additional
byte on GPO1).
 0xE0 = read a response (device drives 16 additional
bytes on GPO1).
For write operations, the system controller must drive
exactly 8 data bytes (a command and seven arguments)
on SDIO after the control byte. The data is captured by
the device on the rising edge of SCLK.

For read operations, the controller must read exactly 1
byte (STATUS) after the control byte or exactly 16 data
bytes (STATUS and RESP1–RESP15) after the control
byte. The device changes the state of SDIO (or GPO1, if
specified) on the falling edge of SCLK. Data must be
captured by the system controller on the rising edge of
SCLK.
Keep SEN low until all bytes have transferred. A
transaction may be aborted at any time by setting SEN
Rev. 1.0
Si4736/37/38/39-B20
high and toggling SCLK high and then low. Commands
will be ignored by the device if the transaction is
aborted.
For details on timing specifications and diagrams, refer
to Figure 6 and Figure 7 on page 10.
4.16. GPO Outputs
The Si4736/37/38/39 provides three general-purpose
output pins. The GPO pins can be configured to output
a constant low, constant high, or high-impedance. The
GPO pins can be reconfigured as specialized functions.
GPO2/INT can be configured to provide interrupts and
GPO3 can be configured to provide external crystal
support or as DCLK in digital audio output mode. In
digital output mode (Si4737/39 only), pin 16 and pin 17
can be configured as DFS and DOUT, respectively.
4.17. Firmware Upgrades
The Si4736/37/38/39 contains on-chip program RAM to
accommodate minor changes to the firmware. This
allows Silicon Laboratories to provide future firmware
updates to optimize the characteristics of new radio
designs and those already deployed in the field.
4.18. Reset, Power Up, and Power Down
Setting the RST pin low will disable analog and digital
circuitry, reset the registers to their default settings, and
disable the bus. Setting the RST pin high will bring the
device out of reset.
4.19. Programming with Commands
To ease development time and offer maximum
customization, the Si4736/37/38/39 provides a simple
yet powerful software interface to program the receiver.
The device is programmed using commands,
arguments, properties and responses.
To perform an action, the user writes a command byte
and associated arguments causing the chip to execute
the given command. Commands control an action such
as power up the device, shut down the device, or tune
to a station. Arguments are specific to a given command
and are used to modify the command. A complete list of
commands is available in Table 14, “Si473x Command
Summary,” on page 25.
Properties are a special command argument used to
modify the default chip operation and are generally
configured immediately after power up. Examples of
properties are de-emphasis level, RSSI seek threshold,
and soft mute attenuation threshold. A complete list of
properties is available in Table 15, “Si473x Property
Summary,” on page 26.
Responses provide the user information and are
echoed after a command and associated arguments are
issued. All commands provide a one-byte status update
indicating interrupt and clear-to-send status information.
For a detailed description of the commands and
properties for the Si4736/37/38/39, see “AN332:
Universal Programming Guide.”
A power down mode is available to reduce power
consumption when the part is idle. Putting the device in
power down mode will disable analog and digital
circuitry while keeping the bus active.
24
Rev. 1.0
Si4736/37/38/39-B20
5. Commands and Properties
Table 14. Si473x Command Summary
Cmd
Name
Description
0x01
POWER_UP
0x10
GET_REV
0x11
POWER_DOWN
Power down device.
0x12
SET_PROPERTY
Sets the value of a property.
0x13
GET_PROPERTY
Retrieves a property’s value.
0x14
GET_INT_STATUS
Read interrupt status bits.
0x15
PATCH_ARGS
Reserved command used for firmware file downloads.
0x16
PATCH_DATA
Reserved command used for firmware file downloads.
0x20
FM_TUNE_FREQ
Selects the FM tuning frequency.
0x21
FM_SEEK_START
Begins searching for a valid frequency.
0x22
FM_TUNE_STATUS
Queries the status of previous FM_TUNE_FREQ or FM_SEEK_START
command.
0x23
FM_RSQ_STATUS
Queries the status of the Received Signal Quality (RSQ) of the current
channel.
0x24
FM_RDS_STATUS
Returns RDS information for current channel and reads an entry from the
RDS FIFO (Si4737/39 only).
0x40
AM_TUNE_FREQ
Tunes to a given AM frequency.
0x41
AM_SEEK_START
Begins searching for a valid frequency.
0x42
AM_TUNE_STATUS
Queries the status of the already issued AM_TUNE_FREQ or AM_SEEK_START command.
0x43
AM_RSQ_STATUS
Queries the status of the RSQ for the current channel.
0x50
WB_TUNE_FREQ
Selects the WB tuning frequency.
0x52
WB_TUNE_STATUS
Queries the status of the previous WB_TUNE_FREQ command.
0x53
WB_RSQ_STATUS
Queries the status of the Received Signal Quality (RSQ) of the current channel.
0x55
WB_ASQ_STATUS
Queries the status of the 1050 Hz alert tone.
0x57
WB_AGC_STATUS
Queries the status of the AGC.
0x58
WB_AGC_OVERRIDE
Enable or disable the WB AGC.
0x80
GPO_CTL
Configures GPO3 as output or Hi-Z.
0x81
GPO_SET
Sets GPO3 output level (low or high).
Power up device and mode selection. Modes include AM or FM receive,
analog or digital output, and reference clock or crystal support.
Returns revision information on the device.
Rev. 1.0
25
Si4736/37/38/39-B20
Table 15. Si473x Property Summary
Prop
Name
0x0001
GPO_IEN
Description
Enables interrupt sources.
0x0102 DIGITAL_OUTPUT_FORMAT Configures the digital output format (Si4737/39 only).
Default
0x0000
0x0000
0x0104
DIGITAL_OUTPUT_
SAMPLE_RATE
Configures the digital output sample rate in 100 Hz steps. The
digital output sample rate is disabled by default (Si4737/39
only).
0x0000
0x0201
REFCLK_FREQ
Sets frequency of reference clock in Hz. The range is 31130 to
34406 Hz, or 0 to disable the AFC. Default is 32768 Hz.
0x8000
0x0202
REFCLK_PRESCALE
Sets the prescaler value for RCLK input.
0x0001
0x1100
FM_DEEMPHASIS
Sets de-emphasis time constant. Default is 75 us.
0x0002
0x1105
FM_BLEND_STEREO_
THRESHOLD
Sets RSSI threshold for stereo blend (Full stereo above threshold, blend below threshold). To force stereo set this to 0. To
force mono set this to 127. Default value is 49 dBuV.
0x0031
0x1106
FM_BLEND_MONO_
THRESHOLD
Sets RSSI threshold for mono blend (full mono below threshold,
blend above threshold). To force stereo set this to 0. To force
0x001E
mono set this to 127. Default value is 30 dBuV.
0x1108
FM_MAX_TUNE_
ERROR
Sets the maximum freq error allowed before setting the AFC rail
0x001E
(AFCRL) indicator. Default value is 30 kHz.
0x1200
FM_RSQ_INT_
SOURCE
0x1201
Configures interrupt related to RSQ metrics.
0x0000
FM_RSQ_SNR_HI_
THRESHOLD
Sets high threshold for SNR interrupt.
0x007F
0x1202
FM_RSQ_SNR_LO_
THRESHOLD
Sets low threshold for SNR interrupt.
0x0000
0x1203
FM_RSQ_RSSI_HI_
THRESHOLD
Sets high threshold for RSSI interrupt.
0x007F
0x1204
FM_RSQ_RSSI_LO_
THRESHOLD
Sets low threshold for RSSI interrupt.
0x0000
0x1207
FM_RSQ_BLEND_
THRESHOLD
Sets the blend threshold for blend interrupt when boundary is
crossed.
0x0081
0x1300
FM_SOFT_MUTE_RATE
Sets the attack and decay rates when entering and leaving soft
mute.
0x0040
0x1302
FM_SOFT_MUTE_
MAX_ATTENUATION
0x1303
FM_SOFT_MUTE_
SNR_THRESHOLD
Sets SNR threshold to engage soft mute. Default is 4 dB.
0x0004
0x1400
FM_SEEK_BAND_
BOTTOM
Sets the bottom of the FM band for seek. Default is 8750.
0x222E
0x1401
FM_SEEK_BAND_TOP
Sets the top of the FM band for seek. Default is 10790.
0x2A26
0x1402
FM_SEEK_FREQ_
SPACING
Selects frequency spacing for FM seek.
0x000A
0x1403
FM_SEEK_TUNE_
SNR_THRESHOLD
Sets the SNR threshold for a valid FM Seek/Tune. Default value
is 3 dB.
0x0003
0x1404
FM_SEEK_TUNE_
RSSI_TRESHOLD
Sets the RSSI threshold for a valid FM Seek/Tune. Default
value is 20 dBuV.
0x0014
26
Sets maximum attenuation during soft mute (dB). Set to 0 to dis0x0010
able soft mute. Default is 16 dB.
Rev. 1.0
Si4736/37/38/39-B20
Table 15. Si473x Property Summary (Continued)
Prop
Name
0x1500
RDS_INT_SOURCE
Description
Default
Configures RDS interrupt behavior.
0x0000
Sets the minimum number of RDS groups stored in the receive
RDS FIFO required before RDS RECV is set.
0x0000
Configures RDS setting.
0x0000
Sets de-emphasis time constant. Can be set to 50 us. Deemphasis is disabled by default.
0x0000
0x1501
RDS_INT_FIFO_COUNT
0x1502
RDS_CONFIG
0x3100
AM_DEEMPHASIS
0x3102
AM_CHANNEL_FILTER
Selects the bandwidth of the channel filter for AM reception. The
0x0003
choices are 6, 4, 3, or 2 (kHz). The default bandwidth is 2 kHz.
0x3200
AM_RSQ_INTERRUPTS
Configures interrupt related to RSQ metrics. All interrupts are
disabled by default.
0x0000
0x3201
AM_RSQ_SNR_HIGH_
THRESHOLD
Sets high threshold for SNR interrupt. The default is 0 dB.
0x0000
0x3202
AM_RSQ_SNR_LOW_
THRESHOLD
Sets low threshold for SNR interrupt. The default is 0 dB.
0x0000
0x3203
AM_RSQ_RSSI_HIGH_
THRESHOLD
Sets high threshold for RSSI interrupt. The default is 0 dB.
0x0000
0x3204
AM_RSQ_RSSI_LOW_
THRESHOLD
Sets low threshold for RSSI interrupt. The default is 0 dB.
0x0000
0x3300
AM_SOFT_MUTE_RATE
Sets the rate of attack when entering or leaving soft mute. The
default is 278 dB/s.
0x0040
0x3301
AM_SOFT_MUTE_SLOPE
Sets the AM soft mute slope. The bigger the number, the higher
the max attenuation level. Default value is a slope of 2.
0x0002
0x3302
AM_SOFT_MUTE_MAX_
ATTENUATION
Sets maximum attenuation during soft mute (dB). Set to 0 to dis0x0010
able soft mute. Default is 16 dB.
0x3303
AM_SOFT_MUTE_SNR_
THRESHOLD
Sets SNR threshold to engage soft mute. Default is 10 dB.
0x000A
0x3400
AM_SEEK_BAND_
BOTTOM
Sets the bottom of the AM band for seek. Default is 520.
0x0208
0x3401
AM_SEEK_BAND_TOP
Sets the top of the AM band for seek. Firmware 1.0 incorrectly
defaults to 1721 kHz instead of 1710.
0x06AE
0x3402
AM_SEEK_FREQ_
SPACING
0x3403
AM_SEEK_SNR_
THRESHOLD
Sets the SNR threshold for a valid AM Seek/Tune. If the value is
zero then SNR threshold is not considered when doing a seek.
Default value is 5 dB.
0x0005
0x3404
AM_SEEK_RSSI_
THRESHOLD
Sets the RSSI threshold for a valid AM Seek/Tune. If the value
is zero then RSSI threshold is not considered when doing a
seek. Default value is 25 dBuV.
0x0019
0x4000
RX_VOLUME
Sets the output volume.
0x003F
0x4001
RX_HARD_MUTE
Mutes the audio output. L and R audio outputs may be muted
independently in FM mode.
0x0000
0x5108
WB_MAX_TUNE_ERROR
Maximum change in frequencies from the WB_TUNE_FREQ to
which the AFC will lock.
0x000F
Selects frequency spacing for AM seek. Default is 10 kHz spac0x000A
ing.
Rev. 1.0
27
Si4736/37/38/39-B20
Table 15. Si473x Property Summary (Continued)
Prop
Name
0x5200
WB_RSQ_INTERRUPT_
SOURCE
Configures interrupts related to RSQ metrics. All interrupts are
disabled by default.
0x0000
0x5201
WB_RSQ_SNR_HIGH_
THRESHOLD
Sets high threshold for SNR interrupt. The default is 0 dB.
0x007F
0x5202
WB_RSQ_SNR_LOW_
THRESHOLD
Sets low threshold for SNR interrupt. The default is 0 dB.
0x0000
0x5203
WB_RSQ_RSSI_HIGH_
THRESHOLD
Sets high threshold for RSSI interrupt. The default is 0 dB.
0x007F
0x5204
WB_RSQ_RSSI_LOW_
THRESHOLD
Sets low threshold for RSSI interrupt. The default is 0 dB.
0x0000
0x5600
WB_ASQ_INTERRUPT_
SOURCE
Configures 1050 Hz alert tone interrupts. All interrupts are disabled by default.
0x0000
28
Description
Rev. 1.0
Default
Si4736/37/38/39-B20
GPO2/INT
GPO3/DCLK
DFS
1
GPO1
NC
NC
6. Pin Descriptions: Si4736/37/38/39-GM
20
19
18
17
16
FMI 2
15 DOUT
RFGND 3
14 LOUT
GND
PAD
AMI 4
13 ROUT
6
7
8
9
10
SCLK
SDIO
RCLK
VIO
12 GND
SEN
RST 5
11 VDD
Pin Number(s)
Name
Description
1, 20
NC
No connect. Leave floating.
2
FMI
FM/WB RF inputs. FMI should be connected to the antenna trace.
3
RFGND
4
AMI
AM RF input. AMI should be connected to the AM antenna.
5
RST
Device reset (active low) input.
6
SEN
Serial enable input (active low).
7
SCLK
Serial clock input.
8
SDIO
Serial data input/output.
9
RCLK
External reference oscillator input.
10
VIO
I/O supply voltage.
11
VDD
Supply voltage. May be connected directly to battery.
12, GND PAD
GND
Ground. Connect to ground plane on PCB.
13
ROUT
Right audio line output in analog output mode.
14
LOUT
Left audio line output in analog output mode.
15
DOUT
Digital output data in digital output mode.
16
DFS
17
GPO3/DCLK
18
GPO2/INT
19
GPO1
RF ground. Connect to ground plane on PCB.
Digital frame synchronization input in digital output mode.
General purpose output, crystal oscillator, or digital bit synchronous clock input
in digital output mode.
General purpose output or interrupt pin.
General purpose output.
Rev. 1.0
29
Si4736/37/38/39-B20
7. Ordering Guide
Part Number*
Description
Package
Type
Operating
Temperature
Si4736-B20-GM
AM/FM/WB Broadcast Radio Receiver
QFN
Pb-free
–20 to 85 °C
Si4737-B20-GM
AM/FM/WB Broadcast Radio Receiver with
RDS/RBDS
QFN
Pb-free
–20 to 85 °C
Si4738-B20-GM
FM/WB Broadcast Radio Receiver
QFN Pb-free
–20 to 85 °C
Si4739-B20-GM
FM/WB Broadcast Radio Receiver with RDS/RBDS
QFN Pb-free
–20 to 85 °C
*Note: Add an “(R)” at the end of the device part number to denote tape and reel option; 2500 quantity per reel.
30
Rev. 1.0
Si4736/37/38/39-B20
8. Package Markings (Top Marks)
8.1. Top Mark
3620
BTTT
YWW
3820
BTTT
YWW
3720
BTTT
YWW
3920
BTTT
YWW
8.2. Top Mark Explanation
Mark Method:
YAG Laser
Line 1 Marking:
Part Number
36 = Si4736, 37 = Si4737, 38 = Si4738, 39 = Si4739
Firmware Revision
20 = Firmware Revision 2.0
Die Revision
B = Revision B Die
TTT = Internal Code
Internal tracking code
Line 2 Marking:
Line 3 Marking:
Circle = 0.5 mm Diameter Pin 1 Identifier
(Bottom-Left Justified)
Y = Year
WW = Workweek
Assigned by the Assembly House. Corresponds to the last significant digit of the year and workweek of the mold date.
Rev. 1.0
31
Si4736/37/38/39-B20
9. Package Outline: Si4736/37/38/39 QFN
Figure 14 illustrates the package details for the Si4736/37/38/39. Table 16 lists the values for the dimensions
shown in the illustration.
Figure 14. 20-Pin Quad Flat No-Lead (QFN)
Table 16. Package Dimensions
Symbol
Millimeters
Symbol
Min
Nom
Max
A
0.50
0.55
0.60
f
A1
0.00
0.02
0.05
L
0.35
0.40
0.45
b
0.20
0.25
0.30
L1
0.00
—
0.10
c
0.27
0.32
0.37
aaa
—
—
0.05
bbb
—
—
0.05
ccc
—
—
0.08
ddd
—
—
0.10
eee
—
—
0.10
D
D2
1.65
1.70
1.75
0.50 BSC
E
E2
Min
3.00 BSC
e
3.00 BSC
1.65
1.70
1.75
Notes:
1. All dimensions are shown in millimeters (mm) unless otherwise noted.
2. Dimensioning and tolerancing per ANSI Y14.5M-1994.
32
Millimeters
Rev. 1.0
Nom
Max
2.53 BSC
Si4736/37/38/39-B20
10. PCB Land Pattern: Si4736/37/38/39 QFN
Figure 15 illustrates the PCB land pattern details for the Si4736/37/38/39-GM. Table 17 lists the values for the
dimensions shown in the illustration.
Figure 15. PCB Land Pattern
Rev. 1.0
33
Si4736/37/38/39-B20
Table 17. PCB Land Pattern Dimensions
Symbol
Millimeters
Min
D
D2
Symbol
Max
2.71 REF
1.60
1.80
Min
Max
GE
2.10
—
W
—
0.34
—
e
0.50 BSC
X
E
2.71 REF
Y
E2
f
GD
1.60
1.80
2.53 BSC
2.10
Millimeters
0.28
0.61 REF
ZE
—
3.31
ZD
—
3.31
—
Notes: General
1. All dimensions shown are in millimeters (mm) unless otherwise noted.
2. Dimensioning and Tolerancing is per the ANSI Y14.5M-1994 specification.
3. This Land Pattern Design is based on IPC-SM-782 guidelines.
4. All dimensions shown are at Maximum Material Condition (MMC). Least Material
Condition (LMC) is calculated based on a Fabrication Allowance of 0.05 mm.
Notes: Solder Mask Design
1. All metal pads are to be non-solder mask defined (NSMD). Clearance between the
solder mask and the metal pad is to be 60 µm minimum, all the way around the pad.
Notes: Stencil Design
1. A stainless steel, laser-cut and electro-polished stencil with trapezoidal walls should
be used to assure good solder paste release.
2. The stencil thickness should be 0.125mm (5 mils).
3. The ratio of stencil aperture to land pad size should be 1:1 for the perimeter pads.
4. A 1.45 x 1.45 mm square aperture should be used for the center pad. This provides
approximately 70% solder paste coverage on the pad, which is optimum to assure
correct component stand-off.
Notes: Card Assembly
1. A No-Clean, Type-3 solder paste is recommended.
2. The recommended card reflow profile is per the JEDEC/IPC J-STD-020C
specification for Small Body Components.
34
Rev. 1.0
Si4736/37/38/39-B20
11. Additional Reference Resources








EN55020 Compliance Test Certificate
AN231: Si4700/01 Headphone and Antenna Interface
AN332: Universal Programming Guide
AN383: Universal Antenna Selection and Layout Guidelines
AN386: Si473x Ferrite Loop Stick Antenna Interface
AN388: Si473x AM/FM Tuner Evaluation Board Test Procedure
AN389: Si473x EVB Quick-Start Guide
Si47xx Customer Support Site: http://www.mysilabs.com
This site contains all application notes, evaluation board schematics and layouts, and evaluation software. NDA
is required for access. To request access, register at http://www.mysilabs.com and send user’s first and last
name, company, NDA reference number, and mysilabs user name to [email protected] Silicon Labs
recommends an all lower case user name.
Rev. 1.0
35
Si4736/37/38/39-B20
DOCUMENT CHANGE LIST
Revision 0.4 to Revision 0.5
Updated Table 3, “DC Characteristics,” on page 5.
Updated Table 5, “2-Wire Control Interface
Characteristics1,2,3,” on page 7.
 Updated Table 8, “Digital Audio Interface
Characteristics,” on page 11.









36
Updated Table 9, “FM Receiver Characteristics1,2,”
on page 12.
Updated Table 10, “WB Receiver Characteristics1,”
on page 13.
Updated Table 11, “AM Receiver Characteristics1,”
on page 14.
Updated Table 12, “Reference Clock and Crystal
Characteristics,” on page 15.
Updated "3. Bill of Materials" on page 17.
Added GPO_CTL and GPO_SET commands to
Table 13, “Bus Mode Select on Rising Edge of RST,”
on page 22.
Updated "11. Additional Reference Resources" on
page 35..
Rev. 1.0
Si4736/37/38/39-B20
NOTES:
Rev. 1.0
37
Si4736/37/38/39-B20
CONTACT INFORMATION
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The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice.
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38
Rev. 1.0
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