SI4712-B30 Datasheet, PDF (1/42 Pages) Silicon Laboratories – FM RADIO TRANSMITTER WITH RECEIVE POWER SCAN

Si4712/13-B30
FM RADIO TRANSMITTER WITH RECEIVE POWER SCAN
Features
 Integrated receive power
measurement
 Worldwide FM band support
(76–108 MHz)
 Requires only two external
components
 Frequency synthesizer with
integrated VCO
 Digital stereo modulator
 Programmable pre-emphasis
 Analog/digital audio interface
 Audio silence detector
 Programmable reference clock
 RDS/RBDS encoder (Si4713 only)
 PCB loop and stub antenna
support with self-calibrated
capacitor tuning
 Programmable transmit level
 Audio dynamic range control
 Advanced modulation control
 2.7 to 5.5 V supply voltage
 Integrated LDO regulator
 3 x 3 x 0.55 mm 20-pin QFN
Pb-free and RoHS Compliant
 Designed for compatibility with
cellular operation
Applications
 Cellular handsets/hands-free
 MP3 players
 Portable media players
 Wireless speakers/microphone
 Satellite digital audio radios
 Personal computers/notebooks
Description
The Si4712/13-B30 integrates the complete transmit functions for
standards-compliant unlicensed FM broadcast stereo transmission. The
chip also allows integrated receive power scanning to identify low signal
power FM channels. Users must comply with local regulations on radio
frequency (RF) transmission.
Functional Block Diagram
Si4712/13
Ordering Information:
See page 34.
Pin Assignments
Si4712/13-B30
(Top View)
NC 1 ^{20 19 18 17} 16
NC 2
15 RIN
RFGND 3
TXO 4
GND
PAD
14 DFS
13 DIN
RST 5
12 GND
6 _{7 8 9 10} 11 VDD
Tx
Ant
TXO
L1
120 nH
RFGND
PEAK
DETECT
DIGITAL
DIN
AUDIO
DFS
DSP
DAC
ADC
LIN
DAC
ADC
RIN
Patents pending
Note: To ensure proper operation and
performance, follow the guide-
lines in “AN383: Universal
Antenna Selection and Layout
Guidelines.” Silicon Laboratories
will evaluate schematics and lay-
outs for qualified customers.
VDD 2.7–5.5 V
AFC
CONTROL
INTERFACE
GPO
RDS (Si4713)
LDO
GND C1
22 nF
Rev. 1.1 2/08
Copyright © 2008 by Silicon Laboratories
Si4712/13-B30