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Si4730/31-D50
B ROADCAST AM/FM R ADIO R ECEIVER
Features
? Worldwide FM band support
(64–108 MHz)
? No manual alignment necessary
? Programmable reference clock
?
?
?
?
?
?
?
?
?
?
?
?
Worldwide AM band support
(520–1710 kHz)
Excellent real-world performance
Integrated VCO
Advanced AM/FM seek tuning
AM/FM digital tuning
Automatic frequency control (AFC)
Automatic gain control (AGC)
Digital FM stereo decoder
Programmable AVC max gain
Programmable de-emphasis
Seven selectable AM channel filters
Advanced audio processing
? Volume control
? Adjustable soft mute control
? RDS/RBDS processor (Si4731 only)
? I 2 S digital audio out
? 2-wire and 3-wire control interface
? Integrated LDO regulator
? Wide range of ferrite loop sticks and
air loop antennas supported
? QFN package
? RoHS compliant
? Not suitable for wall-plugged
consumer electronic applications*
Ordering Information:
See page 26.
Pin Assignments
Si4730/31
*Note: For consumer electronics applications, use Si4730/31-D60 for worldwide
CE and EN compliance.
NC
1
20
19
18
17
16
Applications
FMI 2
15 DOUT
?
?
Cellular handsets
MP3 players
?
?
Mobile Internet Devices ? Tablets
USB FM radio ? eBooks
RFGND 3
AMI 4
GND
PAD
14 LOUT
13 ROUT
?
Portable navigation
RST 5
12 GND
Description
6
7
8
9
10
11 VA
The Si4730/31-D50 is the fourth generation digtial CMOS AM/FM radio receiver
IC from Silicon Labs. The Si4730/31-D50 integrates the complete tuner function
from antenna input to audio output.
Functional Block Diagram
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
AM
ANT
AMI
RFGND
LNA
RDS
(Si4731)
Si473x
DIGITAL
AUDIO
DOUT
DFS
foreign and domestic: 7,127,217;
7,272,373; 7,272,375; 7,321,324;
7,355,476; 7,426,376; 7,471,940;
7,339,503; 7,339,504.
AGC
LOW-IF
GPO/DCLK
FM
ADC
DAC
ROUT
ANT
FMI
LNA
DSP
AGC
ADC
DAC
LOUT
2.7– 5.5 V
VA
GND
LDO
AFC
CONTROL
INTERFACE
VD
1.62–3.6 V
Rev. 1.0 2/11
Copyright ? 2011 by Silicon Laboratories
Si4730/31-D50
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