SI4708-B-GM Silicon Labs

Si4708/09-B BROADCAST FM RADIO TUNER FOR PORTABLE APPLICATIONS Features Worldwide FM band support Adjustable soft mute (76108 MHz) Volume control Digital low-IF receiver Line-level analog output Frequency synthesizer with 32.768 kHz reference clock integrated VCO 2-wire and 3-wire control Adjustable seek tuning interface Automatic frequency control 2.7 to 5.5 V supply voltage D (AFC) Ordering Information: 2.7 to 5.5 V supply voltage A Automatic gain control (AGC) See page 34. Integrated LDO regulator allows Excellent overload immunity direct connection to battery Signal strength measurement 2.5 x 2.5 mm 16-pin QFN Pin Assignments Programmable de-emphasis package (Top View) (50/75 s) Pb-free/RoHS compliant Adaptive noise suppression RDS/RBDS Processor (Si4709) Si4708/09-GM Applications 1 16 15 14 13 LOUT Cellular handsets Portable navigation USB FM radio FMI 2 12 ROUT MP3 players Consumer electronics PDAs Portable radios Notebook PCs GND RFGND 3 11 GND Description PAD The Si4708/09 is the world's smallest FM broadcast receiver, integrating 4 10 VD RST the complete tuner function from antenna input to stereo audio output with 5 6 7 8 SEN 9 RDS (Si4709). Functional Block Diagram Patents pending Headphone Si4708/09 Notes: Cable 1. To ensure proper operation and FM I LOUT DAC ADC receiver performance, follow the FMI LNA PGA DSP guidelines in AN350: Si4708/09 RFGND Q ROUT Antenna, Schematic, Layout, and DAC ADC Design Guideline and AN383: Si47xx Antenna Selection and GPO AGC 0 / 90 LOW-IF GPIO Universal Layout Guidelines. Silicon Laboratories will evaluate schematics 32.768 kHz VIO and layouts for qualified customers. RCLK RDS AFC RST TUNE (Si4709) 2. Place Si4708/09 as close as possible SDIO to antenna jack and keep the FMI VA SCLK trace as short as possible. REG RSSI VD SEN Rev. 1.4 3/10 Copyright 2010 by Silicon Laboratories Si4708/09-B CONTROL INTERFACE CONTROLLER AMPLIFIER NC NC SCLK GPO SDIO V V IO A RCLKSi4708/09-B 2 Rev. 1.4