Rev. 0.5 10/08 Copyright © 2008 by Silicon Laboratories Si473x-B20
Si473x-B20
BROADCAST MULTI-BAND RADIO RECEIVER
Features
Applications
Si473x Product Selector Guide
FM band support: 76–108 MHz
AM band support: 520–1710 kHz
SW band support: 2.3–21.85 MHz
(Si4734/35)
LW band support: 153–279 kHz
(Si4734/35)
Weather band support: 162.4–
162.55 MHz (Si4736/37/38/39)
1050 Hz alert tone detection
(Si4736/37/38/39)
Excellent real-world performance
Freq synthesizer with integrated VCO
Advanced seek tuning
Automatic frequency control (AFC)
Automatic gain control (AGC)
Integrated LDO regulator
Digital FM stereo decoder
Programmable de-emphasis
Adaptive noise suppression
AM/FM digital tuning
EN55020 compliant
No manual alignment necessary
Programmable reference clock
Volume control
Programmable soft mute control
RDS/RBDS processor
(Si4731/35/37/39)
Optional digital audio output
(Si4731/35/37/39)
2-wire control interface
2.7 to 5.5 V supply voltage
Firmware upgradeable
Wide range of ferrite loop sticks and
air loop antennas supported
3 x 3 x 0.55 mm 20-pin QFN package
Pb-free/RoHS compliant
Table and portable radios
Audio video receivers
Stereos
Mini/micro systems
CD/DVD players
Portable media players
Cellular handsets
Emergency radios
Clock radios
Modules
Mini HiFi
Boom boxes
Part FM AM RDS SW/LW WB
Si4730 76 – 108 MHz
Si4731 76 – 108 MHz
Si4734 64 – 108 MHz
Si4735 64 – 108 MHz
Si4736 76 – 108 MHz
Si4737 76 – 108 MHz
Si4738 76 – 108 MHz
Si4739 76 – 108 MHz
Patents Pending
Notes:
1. Place Si473x as close as
possible to antenna jack and
keep the FMI and AMI traces as
short as possible.
2. Contact your local sales
representatives for more
information or to obtain
application notes.
Ordering Information:
See page 18.
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
Si473x-GM
(Top View)
