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SI4720-B20 Folha de dados(PDF) 1 Page - Silicon Laboratories

Nome de Peças SI4720-B20
Descrição Electrónicos  BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS
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Fabricante Electrônico  SILABS [Silicon Laboratories]
Página de início  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI4720-B20 Folha de dados(HTML) 1 Page - Silicon Laboratories

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Rev. 1.0 2/08
Copyright © 2008 by Silicon Laboratories
Si4720/21-B20
.
Si4720/21-B20
B ROADCAST FM R ADIO TRANSCEIVER FOR P ORTABLE A PPLICATIONS
Features
Applications
Description
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
Full FM RX and TX in 3 x 3 QFN
Worldwide FM RX band support
Compliant with worldwide FM TX
regulations
Excellent real-world performance
Supports integrated TX/RX
antenna
Programmable transmit output
voltage
Frequency synthesizer with
integrated VCO
Integrated LDO regulator
Minimal BOM (15 mm2)
Digital audio output
(Si4721 only)
Digital audio input
Adjustable seek parameters
Adjustable mono/stereo blend
Adjustable soft mute
Advanced modulation control
Audio dynamic range control
Audio silence detector
Programmable reference clock
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)
Cellular handsets/hands-free
MP3 players
Portable media players
Wireless speakers/microphone
Satellite digital audio radios
Personal computers/notebooks
ADC
ADC
Si4720/21
DSP
DAC
DAC
PGA
AFC
FMI
AGC
Tx/Rx Ant
Rx Ant*
TXO
RFGND
CONTROL
INTERFACE
GPO
LIN/DFS
RIN/DOUT
ROUT/DIN
LOUT/DFS
LDO
VDD
GND
2.7–5.5 V
C1
22 uF
L1
120 nH
LNA
*Note: Dedicated Rx antenna is optional
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.
Ordering Information:
See page 42.
Pin Assignments
GND
PAD
1
2
3
17
18
19
20
11
12
13
14
6
7
8
9
4
5
16
10
15 RIN/DOUT
LOUT/DFS
ROUT/DIN
GND
RST
NC
TXO
VDD
FMI
RFGND
Si4720/21
(Top View)


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