Si4736/37/38/39-C40
BROADCAST AM/FM RADIO RECEIVER
Features
NOAA weather band support
(162.4–162.55 MHz)
Worldwide FM band support
(64–108 MHz)
AM/FM/WB digital tuning
No manual alignment necessary
Programmable reference clock
Volume control
Worldwide AM band support
(520–1710 kHz) (Si4736/37)
1050 Hz alert tone detection
Excellent real-world performance
Freq synthesizer with integrated VCO
Advanced AM/FM seek tuning
Automatic frequency control (AFC)
Automatic gain control (AGC)
Digital FM stereo decoder
Programmable AVC max gain
Programmable de-emphasis
Adjustable soft mute control
RDS/RBDS processor (Si4737/39)
Optional digital audio out (Si4737/39)
2-wire and 3-wire control interface
Integrated LDO regulator
2.0 to 5.5 V supply voltage (SSOP)
2.7 to 5.5 V supply voltage (QFN)
Wide range of ferrite loop sticks and
air loop antennas supported
Ordering Information:
See page 32.
Pin Assignments
Si4736/37/38/39 (QFN)
QFN and SSOP packages
RoHS compliant
Applications
20 19 18 17
NC
FMI
1
16
2
15 DOUT
14 LOUT
13 ROUT
12 GND
11 VDD
Emergency radios
Table and portable radios
Stereos
Boom boxes
Modules
Clock radios
Mini HiFi
RFGND
AMI
3
4
5
GND
PAD
Mini/micro systems
RST
6
7
8
9
10
Description
The Si4736/37/38/39 is the first digital CMOS AM/FM radio receiver IC that
integrates the complete tuner function from antenna input to audio output.
Si4736/37 (SSOP)
DOUT
1
2
24
23
22
21
20
19
18
17
16
15
14
13
LOUT
ROUT
Functional Block Diagram
DFS
GPO3/DCLK
GPO2/INT
GPO1
NC
3
DBYP
VDD
VIO
4
5
Si473x
RCLK
SDIO
SCLK
SEN
6
AMI
RDS
(Si4737/
39)
DIGITAL
AUDIO
(Si4737/
39)
DOUT
NC
7
AM
LNA
AGC
ANT
RFGND
FMI
8
DFS
RFGND
NC
9
GPO/DCLK
LOW-IF
RST
10
11
12
NC
GND
GND
FM/
WB
ANT
ADC
ADC
DAC
DAC
ROUT
LOUT
AMI
LNA
AGC
DSP
FMI
This product, its features, and/or its
architecture is covered by one or more of
the following patents, as well as other
patents, pending and issued, both foreign
and domestic: 7,127,217; 7,272,373;
2.7– 5.5 V (QFN)
2.0– 5.5 V (SSOP)
VDD
GND
CONTROL
INTERFACE
LDO
AFC
VIO
1.85–3.6 V
7,272,375;
7,426,376;
7,339,504.
7,321,324;
7,471,940;
7,355,476;
7,339,503;
Rev. 1.0 12/09
Copyright © 2009 by Silicon Laboratories
Si4736/37/38/39-C40