Specifications

Rev. 1.0 4/08 Copyright © 2008 by Silicon Laboratories Si4734/35-B20
Si4734/35-B20
BROADCAST AM/FM/SW/LW RADIO RECEIVER
Features
Applications
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.
Functional Block Diagram
Worldwide FM band support
(64–108 MHz)
Worldwide AM band support
(520–1710 kHz)
SW band support (2.3–21.85 MHz)
LW band support (153–279 KHz)
Excellent real-world performance
Freq synthesizer with integrated VCO
Automatic frequency control (AFC)
Automatic gain control (AGC)
Integrated LDO regulator
Digital FM stereo decoder
Programmable de-emphasis
Adaptive noise suppression
AM/FM/SW/LW digital tuning
No manual alignment necessary
Adjustable channel filters
EN55020 complaint
Programmable reference clock
Digital volume control
Adjustable soft mute control
RDS/RBDS processor (Si4735 only)
Optional digital audio out (Si4735 only)
2-wire and 3-wire control interface
2.7 to 5.5 V supply voltage
Wide range of ferrite loop sticks and air
loop antennas supported
3 x 3 x 0.55 mm 20-pin QFN package
z Pb-free/RoHS compliant
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
ADC
ADC
Si4734/35
DSP
DAC
DAC
FMI
FM / SW
ANT
VIO
1.5-3.6V
SCLK
SDIO
CONTROL
INTERFACE
SEN
RST
ROUT
LOUT
LDO
VDD
GND
2.7 - 5.5 V
RDS
(Si4735)
AM / LW
ANT
RFGND
AMI
LNA
LNA
LOW-IF
DIGITAL
AUDIO
(Si4735)
DOUT
DFS
GPO/DCLK
AGC
AGC
AFC
RCLK
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.
Ordering Information:
See page 31.
Pin Assignments
GND
PAD
1
2
3
17181920
11
12
13
14
6
7 8 9
4
5
16
10
15
GPO2/INT
VIO
DOUT
LOUT
ROUT
GNDRST
NC
AMI
RCLK
SDIO
VDD
FMI
RFGND
GPO3/DCLK
NC
GPO1
DFS
SCLK
SEN
Si4734/35-GM
(Top View)

Summary of content (38 pages)