Si4708/09 Broadcast FM Radio Tuner for Portable Applications Description Features As the world's smallest FM receiver, the Si4708/09 extends Silicon Laboratories Si4700 FM tuner family and further increases the ease and attractiveness of adding FM radio reception to mobile devices. Requiring only 6.25 mm2 of board space, the Si4708/09 is the world's smallest size along with a minimum component count, flexible and proven programmability, and superior, proven performance. The Si4708/09 leverage Silicon Laboratories' highly successful and patented Si4700/01/02/03 FM tuner, and are software compatible to existing Si4700/01/02/03 FM tuner designs. The Si4708/09 benefits from proven digital integration and 100% CMOS process technology, resulting in a completely integrated solution. The Si4708/ 09’s proven and highly flexible functionality caters to the subjective nature of audio preferences and variable FM broadcast environments worldwide. - Worldwide FM band support (76–108 MHz) - 2.5 x2.5 mm 16-pin QFN package - Pb-free/RoHS compliant - Digital low-IF receiver - Frequency synthesizer with integrated VCO - Seek tuning - Automatic frequency control (AFC) - Automatic gain control (AGC) - Excellent overload immunity - Signal strength measurement - Programmable de-emphasis (50/75 µs) - Adaptive noise suppression - Volume control - Line-level analog output - 32.768 kHz reference clock - RDS/RBDS processor (Si4709 only) - 2-wire and 3-wire control interface - –1.8 to 5.5 V supply voltage - 2.7 to 5.5 VA supply voltage - Integrated LDO regulator allows direct connection to The Si4709 incorporates a digital processor for the European Radio Data System (RDS) and the US Radio Broadcast Data System (RBDS) including all required symbol decoding, block synchronization, error detection, and error correction functions. RDS enables data such as station identification and song name to be displayed to the user. The Si4709 offers a detailed RDS view and a standard view, allowing adopters to selectively choose granularity of RDS status, data, and block errors. Si4709 software is backwards compatible to the proven Si4701/03, adopted by leading cell-phone, PND, and MP3 manufacturers world-wide. The Si4708/09 device’s high level of integration and complete FM system increases quality to manufacturers, improves device yields and simplifies device manufacturing and final testing. battery Applications - Cellular handsets MP3 players PDAs, Notebook PCs Portable radios Portable navigation Automobile applications Consumer electronics USB FM radios RFGND LNA PGA DAC DSP Q ADC AGC 0/90 DAC LOW-IF GPIO 32.768 kHz ROUT GPIO VA VD AFC TUNE REG XTAL OSC RDS (Si4709) RSSI CONTROL INTERFACE VIO RCLK FM Tuner LOUT Copyright © 2008 by Silicon Laboratories RST SDIO SCLK SEN CONTROLLER I ADC FMP AMPLIFIER Si4708/09 Headphone Cable 4.02.08 Si4708/09 Broadcast FM Radio Tuner for Portable Applications Selected Electrical Specifications Parameter Symbol Input Frequency Test Condition Min fRF Typ Max Unit 76 — 108 MHz Sensitivity (S+N)/N = 26 dB — 1.1 — µV EMF Input IP3 |f2 – f1| > 1 MHz; f0 = 2 x f1 – f2 AGC disabled — 106 — dBµV EMF Adjacent Channel Selectivity ±200 kHz — 50 — dB Alternate Channel Selectivity ±400 kHz — 70 — dB — 32.768 — kHz –200 — 200 ppm 72 80 90 mVrms RCLK Frequency RCLK Frequency Tolerance Audio Output Voltage Audio Band Limits 30 — 15k Hz Audio S/N ±1.5 dB — 59 — dB Audio THD — 0.1 0.5 % 2.7 — 5.5 V Supply Voltage VD, VA Interface Supply Voltage VIO 1.5 — 3.6 V Ambient Temperature TA –20 25 85 C Supply Current IAD — 14.6 — mA Powerdown Current IPD — 8.5 12 µA Seek/Tune Time SCLK Frequency fCLK fSCL Powerup Time — — 60 ms/channel 3-wire operation — — 2.5 MHz 2-wire operation — — 400 kHz From powerdown — — 110 ms Package Information NC NC GPO VA Pin Assignments 1 16 15 14 RST 4 SEN 5 GND PAD 11 GND 10 VD 6 7 8 9 RCLK 3 ROUT VIO RFGND 12 SDIO 2 LOUT SCLK FM1 13 Symbol A A1 b c D D2 e E FM Tuner Min 0.50 0.00 0.18 0.25 1.35 Millimeters Nom 0.55 0.02 0.23 0.30 2.50 BSC 1.40 0.50 BSC 2.50 BSC Symbol Max 0.60 0.05 0.28 0.35 1.45 Min Millimeters Nom Max E2 1.35 1.40 1.45 f L aaa bbb ccc ddd eee 0.25 — — — — — 2.00 BSC 0.30 — — — — — 0.35 0.05 0.05 0.08 0.10 0.10 Copyright © 2008 by Silicon Laboratories Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc. 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