Datasheet > Si4720-B20-GM

Si4720-B20-GM

更新时间： 2024-09-17 01:23:03

品牌	Logo	应用领域
芯科 - SILICON		/
页数	文件大小	规格书
48页	1857K
描述
BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS

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数据手册

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Si4720-B20-GM 数据手册

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

 Adjustable soft mute

 Compliant with worldwide FM TX

regulations

 Advanced modulation control

 Audio dynamic range control

 Audio silence detector

 Excellent real-world performance

 Supports integrated TX/RX

antenna

Ordering Information:

 Programmable transmit output

 Programmable reference clock

See page 42.

voltage

input

 Frequency synthesizer with

 2-wire and 3-wire control

integrated VCO

interface

Pin Assignments

 Integrated LDO regulator

 2.7 to 5.5 V supply voltage

Si4720/21

 Minimal BOM (15 mm )

 3 x 3 x 0.55 mm 20-pin Pb-free

(Top View)

QFN package

 Digital audio output

(Si4721 only)

 RDS/RDBS encoder/decoder

(Si4721 only)

 Digital audio input

Applications

 Cellular handsets/hands-free

 MP3 players

 Wireless speakers/microphone

 Satellite digital audio radios

 Personal computers/notebooks

20 19 18 17

FMI

15 RIN/DOUT

14 LOUT/DFS

13 ROUT/DIN

12 GND

 Portable media players

RFGND

TXO

GND

PAD

Description

RST

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.

11 VDD

Functional Block Diagram

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.

Si4720/21

Tx/Rx Ant

TXO

LIN/DFS

120 nH

RIN/DOUT

ROUT/DIN

Rx Ant*

ADC

DAC

FMI

LNA

AGC

PGA

AFC

DSP

RFGND

VDD

LOUT/DFS

2.7–5.5 V

CONTROL

INTERFACE

LDO

GPO

_C1GND

22 uF

*Note: Dedicated Rx antenna is optional

Rev. 1.0 2/08

Si4720/21-B20

12 3 4 5 6 7...48

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