SI4700

Si4700/01 Broadcast FM Radio Tuner for Portable Applications Description The Si4700 is the industry's first FM radio tuner IC to leverage digital integration and 100% CMOS process technology, resulting in a completely integrated solution that requires only one external supply bypass capacitor and less than 20 mm2 of board space. Offering unmatched integration, the Si4700 allows FM radio reception to be added to a variety of portable devices where board space, performance, low power consumption, and ease of use are essential. Leveraging Silicon Laboratories' proven Aero® digital low intermediate frequency (low-IF) receiver architecture and frequency synthesizer technology, the Si4700 delivers superior RF performance and interference rejection. Digital signal processing is utilized to provide optimum sound quality with varying reception conditions. The high integration and complete system production test simplifies design-in, increases quality, and improves manufacturing. The Si4700 also uses a streamlined programming model, which further reduces product development time. Power management is also simplified with an integrated regulator allowing direct connection to a 2.7 to 5.5 V battery. The Si4701 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. Using this feature, the Si4701 enables data such as station identification and song name to be displayed to the user. Features Worldwide FM band support (76–108 MHz) 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 (Si4701 only) 2-wire and 3-wire control interface 2.7 to 5.5 V supply voltage Integrated LDO regulator allows direct connection to battery - 4x4 mm 24-pin QFN package - Lead-free/RoHS compliant - Applications Cellular handsets MP3 players PDAs, Notebook PCs Portable radios USB FM radio Headphone Cable FMIP FMIN PGA Q ADC I ADC Si4700/01 DAC FILTER DEMOD MPX AUDIO DAC ROUT AGC 32.768 kHz 0 / 90 LOW-IF GPIO GPIO VIO CONTROL INTERFACE RCLK 2.7 - 5.5 V VA VD TUNE AFC RDS (Si4701) RST SDIO SCLK SEN REG RSSI FM Tuner Copyright © 2005 by Silicon Laboratories CONTROLLER 7.11.05 AMPLIFIER DSP LOUT Si4700/01 Broadcast FM Radio Tuner for Portable Applications Selected Electrical Specifications Parameter Input Frequency Sensitivity RDS Sensitivity Input IP3 Adjacent Channel Selectivity Alternate Channel Selectivity RCLK Frequency RCLK Frequency Tolerance Audio Output Voltage Audio Band Limits Audio S/N Audio THD Supply Voltage Interface Supply Voltage Ambient Temperature Supply Current Powerdown Current Seek Time SCLK Frequency Powerup Time fCLK fSCL 3-wire operation 2-wire operation From powerdown VD, VA VIO TA IAD IPD — 2.7 1.5 –20 — — — 0 0 — 0 to –3 dB Symbol fRF (S+N)/N = 26 dB ∆f = 2 kHz, RDS BLER = 5% |f2 – f1| > 1 MHz; f0 = 2 x f1 – f2 AGC disabled ±200 kHz ±400 kHz Test Condition Min 76 — — — 35 60 — –200 72 30 Typ — 2.5 15 108 50 70 32.768 — 80 — 63 0.1 — — 25 17.6 4 — — — — 0.5 5.5 3.6 85 — 20 40 2.5 400 50 Max 108 3.5 — — — — — 200 90 15k Unit MHz µV EMF µV EMF dBµV dB dB kHz ppm mVrms Hz dB % V V °C mA µA ms/channel MHz kHz ms Pin Assignments 24 GND 1 FMIP 2 RFGND 3 FMIN 4 GND 5 GND 6 7 RST 8 SEN 9 SCLK 10 SDIO 11 RCLK 12 VIO 23 22 21 20 GPIO3 GPIO1 GPIO2 GND NC NC 19 18 VA 17 GND Package Information GND PAD 16 LOUT 15 ROUT 14 GND 13 VD Symbol A A1 b D, E D2, E2 e Min 0.80 0.00 0.18 2.20 Millimeters Nom 0.85 0.02 0.25 4.00 BSC 2.30 0.50 BSC Symbol Max 0.90 0.05 0.30 2.40 L L1 aaa bbb ccc ddd Min 0.30 0.03 — — — — Millimeters Nom 0.40 0.05 — — — — Max 0.50 0.08 0.10 0.10 0.08 0.10 FM Tuner Copyright © 2005 by Silicon Laboratories 7.11.05 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