Si4734/35-B20
BROADCAST AM/FM/SW/LW RADIO RECEIVER
Features
Worldwide FM band support
No manual alignment necessary
(64–108 MHz)
Adjustable channel filters
Worldwide AM band support
EN55020 complaint
(520–1710 kHz)
Programmable reference clock
SW band support (2.3–21.85 MHz) Digital volume control
LW band support (153–279 KHz)
Adjustable soft mute control
Excellent real-world performance
RDS/RBDS processor (Si4735 only)
Freq synthesizer with integrated VCO Optional digital audio out (Si4735 only)
Automatic frequency control (AFC) 2-wire and 3-wire control interface
Automatic gain control (AGC)
2.7 to 5.5 V supply voltage
Integrated LDO regulator
Wide range of ferrite loop sticks and air
Digital FM stereo decoder
loop antennas supported
Programmable de-emphasis
3 x 3 x 0.55 mm 20-pin QFN package
Adaptive noise suppression
z Pb-free/RoHS compliant
AM/FM/SW/LW digital tuning
Applications
Table and portable radios
Stereos
Mini/micro systems
CD/DVD players
Portable media players
Boom boxes
Cellular handsets
Modules
Clock radios
Mini HiFi
Entertainment systems
Description
The Si4734/35 is the first digital CMOS AM/FM/SW/LW radio receiver IC that
integrates the complete tuner function from antenna input to audio output.
Ordering Information:
See page 31.
Pin Assignments
Si4734/35-GM
(Top View)
NC 1
FMI 2
RFGND 3
AMI 4
RST 5
6
20 19 18 17 16
15 DOUT
GND
PAD
14 LOUT
13 ROUT
12 GND
7 8 9 10 11 VDD
Functional Block Diagram
FM / SW
ANT
FMI
AM / LW
ANT
AMI
RFGND
2.7 - 5.5 V
VDD
GND
LNA
AGC
LNA
AGC
LDO
Si4734/35
RDS
(Si4735)
LOW-IF
DIGITAL
AUDIO
(Si4735)
DOUT
DFS
GPO/DCLK
ADC DAC
DSP
ADC DAC
ROUT
LOUT
AFC
CONTROL
INTERFACE
VIO
1.5-3.6V
Patents pending
Notes:
1. To ensure proper operation and
receiver performance, follow the
guidelines in “AN383: Antenna
Selection and Universal Layout
Guide.” Silicon Laboratories will
evaluate schematics and layouts for
qualified customers.
2. Place Si4734/35 as close as
possible to antenna jack and keep
the FMI and AMI traces as short as
possible.
Rev. 1.0 4/08
Copyright © 2008 by Silicon Laboratories
Si4734/35-B20
