fm tuner copyright ? 2005 by silicon laboratories 7.11.05 vio controller i adc q adc SI4700/01 dsp filter demod mpx audio sclk sdio control interface sen dac dac rout lout 0 / 90 low-if rssi tune gpio amplifier gpio rds (si4701) rst fmin fmip afc agc pga rclk reg va vd 32.768 khz 2.7 - 5.5 v headphone cable 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 mm 2 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 integr ation and complete syst em production test simplifies design-in, increases quality, and improves manufacturing. the SI4700 also uses a streamlined programming model, whic h further reduces product development time. power management is also simplified with an integrated regulator al lowing 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 frequen cy control (afc) - automatic gain control (agc) - excellent overload immunity - signal strength measurement - programmable de-emphasis (50/75 s) - adaptive noise suppression - volume control - line-level analog output - 32.768 khz reference clock - rds/rbds processor (si4701 only) - 2-wire and 3-wire co ntrol 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
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 her ein are trademarks or registered tr ademarks of their respective holders SI4700/01 broadcast fm radio tuner for portable applications selected electrical specifications parameter symbol test condition min typ max unit input frequency f rf 76 ? 108 mhz sensitivity (s+n)/n = 26 db ? 2.5 3.5 v emf rds sensitivity ? f = 2 khz, rds bler = 5% ? 15 ? v emf input ip3 |f 2 ? f 1 | > 1 mhz; f 0 = 2 x f 1 ? f 2 agc disabled ? 108 ? dbv adjacent channel selectivity 200 khz 35 50 ? db alternate channel selectivity 400 khz 60 70 ? db rclk frequency ? 32.768 ? khz rclk frequency tolerance ?200 ? 200 ppm audio output voltage 72 80 90 mvrms audio band limits 0 to ?3 db 30 ? 15k hz audio s/n 63 db audio thd ? 0.1 0.5 % supply voltage v d , v a 2.7 ? 5.5 v interface supply voltage v io 1.5 ? 3.6 v ambient temperature t a ?20 25 85 c supply current i ad ? 17.6 ? ma powerdown current i pd ? 4 20 a seek time ? ? 40 ms/channel sclk frequency f clk 3-wire operation 0 ? 2.5 mhz f scl 2-wire operation 0 ? 400 khz powerup time from powerdown ? ? 50 ms pin assignments gnd pad 1 2 3 21 22 23 24 14 15 16 17 7 8 9 10 4 5 20 13 11 19 18 12 6 nc rclk va gnd lout rout gnd gnd fmin sdio sclk gnd fmip rfgnd gpio1 vd gnd nc gpio2 gnd vio gpio3 sen rst package information symbol millimeters symbol millimeters min nom max min nom max a 0.80 0.85 0.90 l 0.30 0.40 0.50 a1 0.00 0.02 0.05 l1 0.03 0.05 0.08 b 0.18 0.25 0.30 aaa ? ? 0.10 d, e 4.00 bsc bbb ? ? 0.10 d2, e2 2.20 2.30 2.40 ccc ? ? 0.08 e 0.50 bsc ddd ? ? 0.10
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