SI4721-B20-GM 查看數據表（PDF） - Silicon Laboratories
零件编号
产品描述 (功能)
生产厂家
SI4721-B20-GM Datasheet PDF : 48 Pages
| |||
Si4720/21-B20
BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS
Features
Full FM RX and TX in 3 x 3 QFN Adjustable seek parameters
Worldwide FM RX band support Adjustable mono/stereo blend
Compliant with worldwide FM TX Adjustable soft mute
regulations
Excellent real-world performance Advanced modulation control
Supports integrated TX/RX
Audio dynamic range control
antenna
Audio silence detector
Programmable transmit output Programmable reference clock
voltage
input
Frequency synthesizer with
integrated VCO
Integrated LDO regulator
Minimal BOM (15 mm2)
Digital audio output
(Si4721 only)
Digital audio input
2-wire and 3-wire control
interface
2.7 to 5.5 V supply voltage
3 x 3 x 0.55 mm 20-pin Pb-free
QFN package
RDS/RDBS encoder/decoder
(Si4721 only)
Applications
Cellular handsets/hands-free
MP3 players
Portable media players
Description
Wireless speakers/microphone
Satellite digital audio radios
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
2.7–5.5 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 “AN383: 3 mm x 3 mm
QFN Universal Layout Guide.”
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
.
Si4720/21-B20
Share Link: 