Si4730/31-D60 - Silicon Labs

Si4730/31-D60 - Silicon Labs
Si4730/31-D60
Broadcast AM/FM Radio Receiver
Description
Features
The Si4730/31 is the industry's first fully integrated, 100%
CMOS AM/FM radio receiver IC. The Si4730/31-D60 AM/
FM radio delivers excellent performance and is simple to
design-in. Available in a small 3 x 3 mm QFN package, the
Si4730/31 offers unmatched integration and PCB space
savings with a minimal number of external components
and no factory tuned components.
Leveraging Silicon Laboratories' proven and patented
digital receiver architecture, the Si4730/31 delivers
superior RF performance and interference rejection in both
AM and FM bands. The high integration and complete
system production test simplifies design-in, increases
system quality, and improves manufacturability.
The Si4730/31 solution includes advanced seek
algorithms, multipath detection and mitigation, adjustable
soft mute, FM hi-cut control, smart tune, and FM stereo
processing. In addition, the Si4730/31 provides an auxiliary
input to support a full digital system architecture.
The Si4730/31 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 Si4731-D60 incorporates an advanced digital
processor for the European Radio Data System (RDS) and
the North American Radio Broadcast Data System (RBDS)
including
all
required
symbol
decoding,
block
synchronization, error detection, and error correction
functions. Using this feature, the Si4731 enables broadcast
data such as station identification and song name to be
displayed to the end user.
-
Worldwide FM band support (64–108 MHz)
Worldwide AM band support (520–1710 kHz)
AM/FM digital tuning
EN55020 compliant
FM multipath detection and mitigation
FM hi-cut control
Advanced stereo blend
AUXIN stereo ADC
No manual alignment required
Seven selectable AM channel filters
Advanced AM/FM seek tuning
Programmable AVC max gain
Frequency synthesizer with integrated VCO
Automatic frequency control (AFC)
Programmable de-emphasis
Digital FM stereo decoder
Integrated LDO regulator
Wide range of ferrite and air loop antennas supported
Advanced FM RDS/RBDS processor
QFN and SSOP Pb-free/RoHS compliant package
Applications
-
Audio video receivers
Mini/micro systems
Home theater systems
Docking stations
Blu-ray / DVD players
Table / clock radios
Boomboxes
Pin Assignments
NC 1
ADC
LD O
AM/FM Receiver
LO U T
AMI 4
DFS
GPO2/INT
GPO3/DCLK
13 ROUT/DOUT
RST 5
12 GND
7
8
9
10 11 VDD
VIO
6
Si473x (SSOP)
C O N TR O L
IN TER FA C E
A FC
14 LOUT/DFS
GND
PAD
RCLK
DAC
VD
1.62 - 3.6 V
RST
Mux
VA
G ND
R OU T
SDIO
AG C
DAC
DS P
RCLK
+
ADC
SCLK
2.7~5.5 V (Q FN )
2.0~5.5 V (S SO P )
M ux
LN A
15 DIN
RFGND 3
SDIO
AMI
D FS
G PO /D C LK
LO W -IF
AG C
R FG N D
D IG ITA L
A U D IO
20 19 18 17 16
FMI 2
SEN
LN A
D OU T
SCLK
RDS
(Si4731)
FM I
AM / LW
ANT
NC
Si473x-D 60
R IN
LIN
SEN
FM / SW
ANT
GPO1
Si473x (QFN)
Copyright © 2010 by Silicon Laboratories
DOUT/[RIN]
1
24
LOUT/[DFS]
DFS/[LIN]
2
23
ROUT/[DOUT]
GPO3/[DCLK]
3
22
DBYP
GPO2/[INT]
4
21
VA
GPO1
5
20
VD
NC
6
19
RCLK
NC
7
18
SDIO
FMI
8
17
SCLK
RFGND
9
16
SEN
NC
10
15
RST
NC
11
14
GND
AMI
12
13
GND
9.17.10
Si4730/31-D60
Broadcast AM/FM Radio Receiver
New Si4730/31-D60 Features
FM Multipath Detection and Mitigation
Provides the ability to detect a multipath situation and maintain audio SNR fidelity. Multipath mitigation is
important in RF environments with high signal scatterings such as cities with tall buildings.
FM Hi-Cut Control
Hi-cut control is employed to increase the audio quality during low SNR and/or multipath situations. Hi-cut on
the Si4730/31-D60 improves the sound quality by seamlessly selecting 1 of 7 different audio filters to optimize
SNR versus audio frequency range. The end result is lower noise on weak stations and stations suffering from
multipath.
Advanced Stereo Blend
The Si4730/31-D60 uses RSSI, SNR, and multipath to determine the best blend setting, providing an
enhanced user listening experience. Utilizing these three metrics, stereo blend is optimized to allow for full
stereo in high fidelity situations and a blended or full mono in sub-optimal conditions. Traditional stereo blend
only uses the receive signal strength indicator (RSSI) to blend from stereo to mono.
Auxiliary Input
The optional analog auxiliary input (line-in) eliminates the need for an ADC when using a digital system
architecture. The left and right auxiliary inputs get digitized on-chip. Audio output formats include I2S, Leftjustified, and Right-justified.
Advanced RDS Processor
The Si4731-D60 implements an advanced, high-performance RDS processor for demodulation, symbol
decoding, block synchronization, error detection, and error correction. The advance RDS decoder provides
improved RDS sensitivity, excellent RDS persistence, faster lock, and lower decoder error rates resulting in
acquiring RDS information faster and greater data reliability in low SNR environments.
Smart Tune
The Si4730/31-D60 automatically selects the IF injection side to optimize the SNR. This improves the desired
station reception in areas that have large near-in blockers.
Selected Electrical Specifications
Parameter
FM Input Frequency
AM Input Frequency
FM Sensitivity with 50  network
RDS Sensitivity
AM Sensitivity
Input IP3
FM Adjacent Channel Selectivity
FM Alternate Channel Selectivity
FM Audio Stereo Separation
FM Audio S/N
AM Audio S/N
AM and FM Audio THD
AM/FM Receiver
Symbol
fRF
fRF
Test Condition
(S+N)/N = 26 dB
(S+N)/N = 26 dB
|f2 – f1| > 1 MHz; f0 = 2 x f1 – f2
±200 kHz
±400 kHz
Min
64
520
—
—
—
—
—
—
34
—
—
—
Typ
—
—
1.1
8
25
105
50
70
42
63
56
0.1
Max
108
1710
—
—
—
—
—
—
—
—
—
—
Unit
MHz
kHz
µV EMF
µV EMF
µV EMF
dBµV EMF
dB
dB
dB
dB
dB
%
Copyright © 2010 by Silicon Laboratories
Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.
Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders
9.17.10
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using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific
device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories
reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy
or completeness of the included information. Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein. This document does not imply
or express copyright licenses granted hereunder to design or fabricate any integrated circuits. The products must not be used within any Life Support System without the specific
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