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| Si4730/31 Broadcast AM/FM Radio Receiver Description The Si4730/31 is the industry's first fully integrated, 100% CMOS AM/FM radio receiver IC. The Si4730/31 AM/FM radio provides the space savings and low power consumption necessary for portable devices while delivering the high performance and design simplicity desired for all AM/FM solutions. Offering unmatched integration and PCB space savings, the Si4730/31 requires only two external components and less than 15 mm2 of board area. Leveraging Silicon Laboratories' proven and patented Si4700/01 FM digital receiver architecture, the Si4730/31 delivers superior RF performance and interference rejection in both AM and FM bands. The high integration and complete system production test simplifies design-in, increases system quality, and improves manufacturability. The Si4730/31 solution includes advanced seek algorithms, adjustable soft mute, auto-calibrated digital tuning, and FM stereo processing. In addition, the Si4730/ 31 provides a programmable reference clock, I2Ccompatible 2-wire control interface, and a Si4700/01 backwards-compatible 3-wire control interface. The Si4730/31 utilizes digital processing to achieve high fidelity, optimal performance, and design flexibility. The chip provides excellent pilot rejection, selectivity, and unmatched audio performance, and offers both the manufacturer and the end-user extensive programmability and flexibility in listening experience. The SI4731 incorporates a digital processor for the European Radio Data System (RDS) and the North American Radio Broadcast Data System (RBDS) including all required symbol decoding, block synchronization, error detection, and error correction functions. Using this feature, the SI4731 enables broadcast data such as station identification and song name to be displayed to the end user. Features Worldwide FM band support (76-108 MHz) Worldwide AM band support (520-1710 kHz) AM/FM digital tuning Excellent real-world performance Only 2 external components No manual alignment required Adjustable AM channel filters Advanced AM/FM seek tuning Digital volume control Adjustable soft mute control Frequency synthesizer with integrated VCO Automatic frequency control (AFC) Automatic gain control (AGC) Programmable AM/FM de-emphasis Adaptive noise suppression Integrated LDO regulator Programmable reference clock FM RDS/RBDS processor (SI4731 only) 2-wire and 3-wire control interface 2.7 to 5.5 V supply voltage AM ferrite loopstick and air loop antenna support 3 x 3 x 0.55 mm 20-pin QFN package - Pb-free/RoHS compliant Table and portable radios Stereos Mini/micro systems Portable media players Boomboxes Cellular handsets Clock radios Modules Entertainment systems Applications - Si473x AMI AM ANT RFGND LNA AGC ADC FMI LNA AGC 2.7-5.5 V VDD GND LDO AFC ADC DSP DAC LOUT RDS (SI4731) LOW-IF DAC ROUT FM ANT CONTROL INTERFACE VIO 1.5-3.6 V SDIO AM/FM Receiver Copyright (c) 2007 by Silicon Laboratories RCLK SCLK SEN RST 6.15.07 Si4730/31 Broadcast AM/FM Radio Receiver Selected FM Electrical Specifications Parameter Symbol Input Frequency fRF Sensitivity headphone matching Sensitivity 50 matching Input IP3 Adjacent Channel Selectivity Alternate Channel Selectivity Audio Band Limits Audio S/N Audio THD Audio Output Voltage Supply Voltage* VD, VA Interface Supply Voltage* VIO Powerdown Current* IPD *Note: Applies to both FM and AM modes. Test Condition (S+N)/N = 26 dB (S+N)/N = 26 dB |f2 - f1| > 1 MHz; f0 = 2 x f1 - f2 200 kHz 400 kHz 1.5 dB Min 76 -- -- -- -- -- 30 -- -- 72 2.7 1.5 -- Typ -- 2.2 1.1 105 50 70 -- 63 0.1 80 -- -- 10 Max 108 -- -- -- -- -- 15k -- -- 90 5.5 3.6 -- Unit MHz V EMF V EMF dBV EMF dB dB Hz dB % mVrms V V A Selected AM Electrical Specifications Parameter Input Frequency Sensitivity Audio S/N Audio THD Audio Output Voltage Antenna Inductance Symbol fRF Test Condition (S+N)/N = 26 dB Min 520 -- -- -- 54 180 Typ -- 38 58 0.1 60 -- Max 1710 -- -- -- 66 600 Unit kHz V EMF dB % mVrms H Pin Assignments GPO2/INT GPO1 GPO3 3 x 3 x 0.55 mm, 20-pin QFN Package Information NC NC 1 20 19 18 17 16 15 NC FMI 2 RFGND 3 AMI 4 RST 5 6 SEN 7 SCLK 8 SDIO 9 RCLK GND PAD 10 11 VDD VIO NC 14 LOUT 13 ROUT 12 GND Symbol Min A A1 b c D D2 e E E2 0.50 0.00 0.18 0.27 1.60 Millimeters Nom 0.55 0.02 0.25 0.32 3.00 BSC 1.70 0.50 BSC 3.00 BSC 1.70 Max 0.60 0.05 0.30 0.37 1.80 Symbol Min f L L1 aaa bbb ccc ddd eee 0.35 0.00 -- -- -- -- -- Millimeters Nom 2.53 BSC 0.40 -- -- -- -- -- -- Max 0.45 0.10 0.10 0.10 0.08 0.10 0.10 1.60 1.80 AM/FM Receiver Copyright (c) 2007 by Silicon Laboratories 6.15.07 Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc. Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders. |
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