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SI4731-B20-GM
Si4730/31-B20 B ROADCAST AM/FM R ADIO R ECEIVER N ot Pl Re ea c se om U me se n Si de 47 d f 30 o r -3 Ne 1- w 34 D -3 es 5- i g D ns 60 Features Worldwide FM band support (76–108 MHz) Worldwide AM band support (520–1710 kHz) Excellent real-world performance Freq synthesizer with integrated VCO Advanced AM/FM 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 only) Optional digital audio output (Si4731 only) 2-wire and 3-wire control interface 2.7 to 5.5 V supply voltage Ordering Information: See page 29. Firmware upgradeable Wide range of ferrite loop sticks and Pin Assignments air loop antennas supported 3 x 3 x 0.55 mm 20-pin QFN package Pb-free/RoHS compliant Si4730/31-GM (Top View) GPO2/INT GPO3/DCLK DFS 19 18 17 16 FMI 2 15 DOUT 14 LOUT GND PAD 13 ROUT RST 5 Functional Block Diagram LNA RDS (Si4731) AGC LOW-IF ADC AGC VDD LDO AFC RCLK GND DFS GPO/DCLK ROUT DAC LOUT DSP ADC CONTROL INTERFACE 6 7 8 9 10 11 VDD VIO 1.5–3.6 V Notes: 1. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Si47xx Universal Layout Guide.” Silicon Laboratories will evaluate schematics and layouts for qualified customers. 2. Place Si4730/31 as close as possible to antenna jack and keep the FMI and AMI traces as short as possible. RST LNA SEN FMI DOUT DAC SCLK FM ANT DIGITAL AUDIO (Si4731) SDIO RFGND 12 GND Patents pending Si473x AMI Rev. 1.0 2/08 20 AMI 4 The Si4730/31 is the first digital CMOS AM/FM radio receiver IC that integrates the complete tuner function from antenna input to audio output. 2.7– 5.5 V 1 RFGND 3 Description AM ANT NC VIO RCLK GPO1 Cellular handsets Modules Clock radios Mini HiFi Entertainment systems SDIO Table and portable radios Stereos Mini/micro systems CD/DVD players Portable media players Boom boxes SCLK SEN NC Applications Copyright © 2008 by Silicon Laboratories Si4730/31-B20
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