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SI4720-B20-GMR Datasheet, PDF (1/48 Pages) Silicon Laboratories – BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS | |||
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Si4720/21-B20
BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS
Features
ï® Full FM RX and TX in 3 x 3 QFN ï® Adjustable seek parameters
ï® Worldwide FM RX band support ï® Adjustable mono/stereo blend
ï® Compliant with worldwide FM TX ï® Adjustable soft mute
regulations
ï® Excellent real-world performance ï® Advanced modulation control
ï® Supports integrated TX/RX
ï® Audio dynamic range control
antenna
ï® Audio silence detector
ï® Programmable transmit output ï® Programmable reference clock
voltage
input
ï® Frequency synthesizer with
integrated VCO
ï® Integrated LDO regulator
ï® Minimal BOM (15 mm2)
ï® Digital audio output
(Si4721 only)
ï® Digital audio input
ï® 2-wire and 3-wire control
interface
ï® 2.7 to 5.5 V supply voltage
ï® 3 x 3 x 0.55 mm 20-pin Pb-free
QFN package
ï® RDS/RDBS encoder/decoder
(Si4721 only)
Applications
ï® Cellular handsets/hands-free
ï® MP3 players
ï® Portable media players
Description
ï® Wireless speakers/microphone
ï® Satellite digital audio radios
ï® Personal computers/notebooks
The Si4720/21 integrates the complete tuner and transmit functions for
FM broadcast reception and standards-compliant, unlicensed FM
broadcast stereo transmission. Users must comply with local radio
frequency (RF) transmission regulations.
Functional Block Diagram
Tx/Rx Ant
TXO
L1
120 nH
Si4720/21
LIN/DFS
RIN/DOUT
Rx Ant*
FMI
LNA
ADC
DAC
ROUT/DIN
PGA
DSP
RFGND
AGC
ADC
DAC
LOUT/DFS
2.7â5.5 V VDD
C1 GND
22 uF
LDO
AFC
GPO
CONTROL
INTERFACE
Ordering Information:
See page 42.
Pin Assignments
Si4720/21
(Top View)
NC 1 20 19 18 17 16
FMI 2
15 RIN/DOUT
RFGND 3
TXO 4
GND
PAD
14 LOUT/DFS
13 ROUT/DIN
RST 5
12 GND
6 7 8 9 10 11 VDD
Patents pending
Notes:
1. To ensure proper operation and FM
transceiver performance, follow the
guidelines in âAN383: 3 mm x 3 mm
QFN Universal Layout Guide.â
Silicon Laboratories will evaluate
schematics and layouts for qualified
customers.
2. Place the Si4720/21 as close as
possible to the antenna jack, and
keep the FMI trace as short as
possible.
*Note: Dedicated Rx antenna is optional
Rev. 1.0 2/08
Copyright © 2008 by Silicon Laboratories
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Si4720/21-B20
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