Features
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World Tuner Application Due to Integrated VCO Dividers
RF Input for Weather Band Applications
AM Reception 100 kHz Up to 30 MHz
AM Up/Down Conversion Depending on Reception Frequency
VCO Slave Mode for Phase Diversity Applications
FM Image Rejection Mixer
Selectable High-side/Low-side Injection for FM Mode
Selectable FM Mixer Output
RF-AGC Wideband Threshold Programmable for AM and FM
RF-AGC Inband Threshold Programmable
Cascode Control Voltage for AM FET Pre-stage
Integrated Pin-diode Drivers for AM and FM
Three Selectable IF Amplifier Inputs
Fractional PLL with Fast Lock Time
Small Frequency Steps for AM
Excellent SNR for DRM Applications
Differential Reference Frequency Input for PLL Down to 9 kHz or Integrated XCO Driver
Available
Two Wire Interface (TWI) with Two Selectable Bus Addresses
Digital Electronic Alignment of Up to Two External Filter Stages
Flexible and Economic IF Filter Concept
Control Inputs for IF Gain, Reception Frequency and Keyed AGC
Integrated State-machine for Optional Control of Alternative Frequency Check
Only One Power Supply Voltage Necessary
1. Description
The ATR4262M1 is a single-chip AM/FM and weather band tuner dedicated for digital
IF solutions in car-radio applications. ATR4262M1 is produced using Atmel ® ’s
advanced BICMOS2S technology and fulfills the automotive requirements. This part is
suitable for HD Radio™ reception as well as for DRM solutions. The high flexibility
allows to design high performance and cost optimized tuner solutions.
Broadcast
Radio
Front-end IC for
AM/FM/DRM/HD
Radio
ATR4262M1
Summary
Preliminary
NOTE: This is a summary document.
The complete document is available
under NDA. For more information,
please contact your local Atmel sales
office.
4994BS–AUDR–05/08
2. Pin Configuration
Pinning QFN48
AMOUT1
AMOUT2
AMAGCTC1
FMOUT1
FMOUT2
VST
IFIN1
IFREF
IFIN2
VRT
IFIN3
AMAGCT2
Figure 2-1.
48 47 46 45 44 43 42 41 40 39 38 37
36
1
35
2
34
3
33
4
32
5
31
6
ATR4262M1
30
7
29
8
28
9
27
10
26
11
25
12
13 14 15 16 17 18 19 20 21 22 23 24
SW3
IFOUT1
IFOUT2
VSPLL
REF1
REF2
VRPLL
AMLF
FMLF
VTUNE
GNDPLL
VCOBUF
FMAGCTC
KAGC
IFGCL
IFGCM
ENABLE
SDA
SCL
AFCC
VRVCO
VCOB
VCOE
GNDVCO
AMIN1
AMIN2
AMCVC
AMPIND
SW1
FMPIND
FMIN1
FMIN12
FMIN2
DAC1
DAC2
SW2
Table 2-1.
2
Pin Description
Pin
Symbol
Function
1
AMIN1
AM mixer input
2
AMIN2
AM mixer input
3
AMCVC
AM cascode voltage output
4
AMPIND
AM pin diode output
5
SW1
6
FMPIND
7
FMIN1
8
FMIN12
FM mixer input 12
9
FMIN2
FM mixer input 2
10
DAC1
DAC tuning voltage output 1
11
DAC2
DAC tuning voltage output 2
SW1 switching output
FM pin diode output
FM mixer input 1
12
SW2
13
FMAGCTC
SW2 switching output/external tuning voltage input
14
KAGC
Keyed AGC input/SW7/lock detect/AFSAMPLE
15
IFGCL
IF gain control LSB/SW4
RF AGC FM time constant
16
IFGCM
17
ENABLE
IF gain control MSB/SW5
18
SDA
Two-wire control bus SDA
19
SCL
Two-wire control bus SCL
Control bus ENABLE/address select
ATR4262M1 [Preliminary]
4994BS–AUDR–05/08
ATR4262M1 [Preliminary]
Table 2-1.
Pin Description
Pin
Symbol
Function
20
AFCC
21
VRVCO
22
VCOB
VCO resonator (base)
23
VCOE
VCO resonator (emitter)
24
GNDVCO
25
VCOBUF
VCO buffer output/input
26
GNDPLL
PLL ground
27
VTUNE
28
FMLF
PLL loopfilter FM
29
AMLF
PLL loopfilter AM
30
VRPLL
Reference voltage digital
31
REF2
RefClockInput2/crystal oscillator
32
REF1
RefClockInput1/crystal oscillator
AFC control input/SW6 switching output/lock detect/AFHOLD
Reference voltage VCO
VCO ground
Tuning voltage output
33
VSPLL
Supply voltage digital input
34
IFOUT2
IF output 2
35
IFOUT1
IF output 1
36
SW3
37
AMAGCTC2
38
IFIN3
IF amplifier input
39
VRT
Reference voltage tuner
40
IFIN2
IF amplifier input
41
IFREF
IF reference voltage
42
IFIN1
IF amplifier input
43
VST
Supply voltage tuner
44
FMOUT2
FM mixer output
45
FMOUT1
FM mixer output
46
AMAGCTC1
47
AMOUT2
AM mixer output/FM Mixer Output 4
48
AMOUT1
AM mixer output/FM Mixer Output 3
Die pad
GNDT_PAD
SW3 switching output/lock detect/AFSAMPLE
RF AGC AM time constant 2
RF AGC AM time constant 1
Tuner RF and IF Ground
3
4994BS–AUDR–05/08
3. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters
Voltage
Pin Group
Min.
Max.
Unit
Digital
–0.5
+5.5
V
Supply
–0.5
+12
V
Voltage references
–0.5
+6.4
V
SW1, SW3
–0.5
+12
V
SW2
–0.5
VS + 0.5
V
SW4, SW5, SW6, SW7
–0.5
+ 5.5
V
Mixer outputs
–0.5
+16
V
Analog
–0.5
VS + 0.5
V
Switches
0
2.7
mA
Tamb
–40
+100
°C
Storage temperature
Tstg
–40
+100
°C
Junction temperature
Tj
+150
°C
Ptot
1.4
W
Current
Ambient temperature
Power dissipation
ESD HBM
All pins
–2
+2
kV
ESD MM
All pins
–200
+200
V
Parameters
Test Condition
Symbol
Value
Unit
Thermal resistance junction-ambient
Soldered to PCB
RthJA
30
K/W
4. Thermal Resistance
5. Operating Range
Parameters
Symbol
Value
Unit
Supply voltage
VS
8 to 10
V
Supply voltage for operation of control bus
(data preservation in bus registers is guaranteed)
VS
7 to 10
V
Tamb
–40 to +90
°C
Ambient temperature
4
ATR4262M1 [Preliminary]
4994BS–AUDR–05/08
ATR4262M1 [Preliminary]
6. Functional Description
The ATR4262M1 front end is designed for world-tuner applications. Due to its flexible divider
arrangement, the tuner can be used for reception from 100 kHz to 163 MHz. The field of use
covers all the common radio broadcast services from AM-LW to AM-SW (up to 30 MHz) and
from FM-OIRT to US weatherband. The tuner application can be easily adapted to the requirements of DRM and HD-radio (IBOC).
• FM section
The ATR4262M1 contains a high performance FM image rejection mixer, which helps to
reduce the demands and the cost of the front end application. The FM mixer output can be
switched to an alternative pair of pins to allow different IF filter concepts for FM mode. Two
selectable inputs can be used for independent FM front end sections.
• AM section
The AM section contains a dedicated AM prescaler for the LO signal. Very small tuning
steps are possible using this divider, while at the same time a high PLL comparison frequency guarantees excellent phasenoise behavior.
• RF-AGC
Both AM and FM signal paths have their own RFAGCs with a wideband and a inband detector with individual thresholds. The thresholds for AM and FM can be programmed in 2 dB
steps. An optional keyed AGC function reduces the wideband AGC threshold up to 6 dB in
order to avoid desensitization of the tuner. Pin diode drivers for AM and FM are integrated to
reduce cost for external components. In addition to the pin diode control, a cascode control
voltage for the external LNA is provided by the AM-AGC block.
• IF stage
The IF amplifier has three selectable inputs, which can be matched to any common IF filter
impedance by external components. With these inputs, the tuner application can be easily
adapted to different broadcast standards, while conventional standards are still possible.
Gain can be set via pins or by setting bits, which makes the ATR4262M1 very versatile and
easy to adapt to different baseband architectures.
• Fractional PLL
The ATR4262M1 contains a complete fractional PLL, which guarantees fast lock time, low
phase noise and small tuning steps. A reference clock frequency from 9 kHz up to 21 MHz
provided by, for example, baseband can be used. Alternatively the integrated XCO with
standard crystals from 10 MHz to 21 MHz can be used as the reference for the PLL.
• Double tuner concept
Like phase diversity or background tuning, double-tuner applications are also possible. For
phase diversity applications, the tuner can also operate in slave mode with a master tuner
providing the VCO frequency for both tuners.
• Digital electronic alignment
Two independent gain and offset programmable DACs are available to tune the FM front
end section. The PLL’s tuning voltage is used as input for the DACs to ensure proper tracking to the reception frequency. In slave mode, the tuning voltage of a master tuner must be
applied to a dedicated input pin.
5
4994BS–AUDR–05/08
• Alternative frequency check
An optional state machine can control the alternative frequency check sequence for some
common basebands. This feature reduces the CPU load of the main controller because the
statemachine outputs the signals with the correct timing for quality check and muting of the
baseband.
• Switching outputs
Up to seven general-purposes open-drain switches are available to simplify the customer
application.
• Two-wire control interface
The ATR4262 can be programmed via a fast-mode TWI bus interface. Two different IC
addresses can be selected to allow two tuners at the same bus segment. Various programming bits allow unique flexibility of operation modes. A tuner status byte provides
information about the receiving conditions and the PLL status.
• Package and power supply
The ATR4262 comes in a small outline QFN48 package to allow small and cost-effective
tuner applications. A single 8V to 10V supply voltage is sufficient to operate the ATR4262
and to reduce the complexity of the customer application.
6
ATR4262M1 [Preliminary]
4994BS–AUDR–05/08
ATR4262M1 [Preliminary]
7. VCO and AM Prescaler Settings
Table 7-1 gives an example of the VCO divider and AM Prescaler settings and the reception
frequencies.
Table 7-1.
Typical VCO Divider, AM Prescaler Settings, and Reception Frequencies
Band
VCOdivider
(DFM)
N-div.
Prescaler
(DPLL)
IF [MHz]
Min. Reception
Frequency [MHz]
Max. Reception
Frequency [MHz]
Min. VCO
Frequency
Max. VCO
Frequency
AMPrescaler
(DAM)
FM
2
2
+10.7
87.5
108
196.4
237.4
-
JPN
3
3
–10.7
76
90
195.9
237.9
-
WB
1
2
+10.7
162.4
162.55
173.1
173.25
-
OIRT
3
3
+10.7
65.8
74
229.5
254.1
-
OIRT
3
3
–10.7
65.8
74
165.3
189.9
-
LW/MW
-
2
+10.7
0.15
1.605
217
246.1
10
LW/MW
-
2
+10.7
0.15
1.605
195.3
221.49
9
120m
-
2
+10.7
2.3
2.5
208
211.2
8
49m
-
2
+10.7
5.95
6.2
199.8
202.8
6
41m
-
2
+10.7
7.1
7.35
213.6
216.6
6
31m
-
2
+10.7
9.5
9.9
202
206
5
-
2
+10.7
21.45
21.85
192.9
195.3
3
...
...
15m
A small VCO frequency range of e.g., 195.3 MHz to 237.9 MHz allows reception of the most
important bands like FM, JPN, LW, MW, 49m, 41m, and 31m.
8. Power Supply
There is only one power supply voltage (8V to 10V) necessary for operation of the ATR4262M1.
7
4994BS–AUDR–05/08
9. IF Filter Stage Concept
There are several different IF filter concepts possible depending on the broadcast standard and
the targeted quality range of the tuner. For that purpose a programmable switch for the FM mixer
output as well as three programmable inputs for the IF amplifier is available.
Table 9-1.
IF Filter Stage Configuration
Number of Mixer
Output Tanks
Number of IF
Filters
Mixer tank
Ceramic filter (BW 180 kHz)
1
1
Mixer tank
Ceramic filter (BW 180 kHz)
Mixer tank
Ceramic filter (20 kHz)
2
2
AM crystal filter
Not used or connected to
AMFMOUT
Mixer tank
Ceramic filter (BW 180 kHz)
Crystal filter (BW 7 kHz)
1
2
AM crystal filter, separate
tank
Mixer tank
Ceramic filter (BW 180 kHz)
Mixer tank
Crystal filter (BW 7 kHz)
2
2
HD Radio
Mixer tank
Ceramic filter (BW 400 kHz)
Mixer tank
Ceramic filter (BW 180 kHz)
2
2
HD Radio low cost
Not used or connected to
AMFMOUT
Mixer tank
Ceramic filter (BW 400 kHz)
1
1
HD Radio with AM filter
Mixer tank
Ceramic filter (BW 400 kHz)
Mixer tank
Ceramic filter (BW 180 kHz)
Ceramic filter (BW 30 kHz)
2
3
Configuration
FMOUT
AMFMOUT
AM low cost
Not used or connected to
AMFMOUT
AM ceramic filter
(compatible to DRM)
Figure 9-1.
Example of Simple IF Filter Stage Concept
KF2
RS2
180
+VS
RF12
x + y = 300Ω
x
RKF2out
330
KF1
RS1
1k8
RF1out
F2
y
RKF1out
1k8
C
Rin(IF2)
8
IFREF
CIF1in
IFINAM
MXFMOUT
CIF2in
IFINFM
CF2in
Rin(IF1)
ATR4262M1 [Preliminary]
4994BS–AUDR–05/08
ATR4262M1 [Preliminary]
10. Double Tuner Application
Figure 10-1. Double Tuner Operation
IFOUT1
REF
CLK1
IFOUT2
REF
CLK2
IFOUT1
270 pF*
IFOUT2
270 pF*
1 µH*
1 µH*
10 nF*
10 nF*
35
34
IFOUT1
IFOUT2
REF1
32
32
REF2
31
31
IFOUT1
IFOUT2
REF1
ATR4262M1
REF2
VCOBUF
25
25
VCOBUF
27 or
10,11
12
SW2
SDA
18
18
SDA
SCL
19
19
SCL
35
ATR4262M1
34
100 pF
VTUNE
or DAC
Master
ENABLE
Slave
ENABLE
17
17
5V
(high)
10 nF
ENABLE1
10.1
SDA
SCL
ENABLE2
*) optional
Two-Wire Interface-Bus Address Modes
To allow programming of both ICs (e.g., double tuner), SCL and SDA can be connected to both
ICs.
There are two different modes for ENABLE. For example, the ENABLE pin of the master IC is
not connected (open mode). Only a capacitor to ground is required to avoid oscillations of the
ENABLE pin. To program the master IC for open mode, the address byte C2h must be used.
The ENABLE pin of the other IC (slave) has to be set to high. The applied voltage for high mode
should be in the range of 2.5V to 5.3V. Address byte C0h is used as the slave in this case.
Another possibility is the use of separate ENABLE lines which can be controlled by a
microcontroller.
9
4994BS–AUDR–05/08
11. Ordering Information
Extended Type Number
Package
Remarks
ATR4262M1-PLQW
QFN48 - 7 × 7
Taped and reeled
12. Package Information
Package: QFN 48 - 7 x 7
Exposed pad 4.5 x 4.5
(acc. JEDEC OUTLINE No. MO-220)
Dimensions in mm
7
Not indicated tolerances ± 0.05
1 max.
5.5
+0
0.05-0.05
4.5
37
48
1
48
1
36
technical drawings
according to DIN
specifications
0.4±0.1
25
0.23
12
12
24
13
0.5 nom.
Drawing-No.: 6.543-5089.01-4
Issue: 2; 24.01.03
10
ATR4262M1 [Preliminary]
4994BS–AUDR–05/08
ATR4262M1 [Preliminary]
13. Revision History
Please note that the following page numbers referred to in this section refer to the specific revision
mentioned, not to this document.
Revision No.
History
4994BS-AUDR-03/08
• all pages: Part Number changed in ATR4262M1
• all pages: IBOC changed in HD Radio
• Page 1: Features changed
• Page 4: Table Absolute Maximum Ratings changed
• Page 5: narrowband replaced by inband
• Page 7: Last row changed
• Page 9: Heading 22.1 changed
• Page 10: Ordering Information changed
11
4994BS–AUDR–05/08
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4994BS–AUDR–05/08