am/fm receiver copyright ? 2008 by silicon laboratories 10.23.08 adc adc si474x dsp dac dac ami vio sclk sdio cntrl sen rst rout lout ldo vdd gnd 3.0?3.6 v rds gnd fmi lna lna digital audio dout dfs dclk agc agc afc rclk weak signal condition quality detector agc gpo1-3 si4740/41/42/43/44/45 automotive am/fm radio receiver description the si474x receiver family applies 100% rf cmos technology to bring digital low-if radio technology to the automotive receiver market. t he si474x receiver family builds on silicon laboratories? highly successful broadcast audio radio products, offering design simplicity, unmatched integration, programmability, and automotive quality and reliability. the si474x receiver family supports world-wide fm bands from 64?108 mhz and am bands from 520?1710 khz. the si474x supports am/fm, we ather band, shortwave, and longwave radio bands. all odd-numbered part numbers in the family support international rds/rbds protocols. the si474x family leverages silicon laboratories? patented digital architecture, delivering superior rf performance and interference rejection. the proven digital radio technology provides excellent sensitivity in weak signal environments, and superb selectivity and inter-modulation immunity in strong signal environments. the solution offers programmable am/fm channel spacing and filters, auto-calibrated digital tuning, and proven am/fm seek functionality based on multiple signal quality and band parameters. the family offers highly flexible and advanced audio features such as noise blanking, programmable soft mute, and multi-path detection and mitigation. the si474x receiver system has a minimal bill of materials requiring a small amount of board space. the high level of integration provides a complete, tested broadcast audio receiver that is ideal for primary automotive radio receivers. features - worldwide fm band support (64?108 mhz) - worldwide am band support (520?1710 khz) - shortwave, longwave support (si4742/43/44/45 only) - weather band support (si4742/43 only) - received signal quality indicators (rssi, snr, adjacent channel, wideband am) - multipath detection/mitigation - am and fm noise blankers (si4742/43/44/45 only) - am and fm programmable seek tuning - am and fm programmable soft mute control - am and fm adjustable channel bandwidth filters - fm stereo-mono blending - fm hi-cut control (si4742/43/44/45 only) - digital fm stereo decoder - rds/rbds processor (si4741/43/45 only) - automatic frequency control (afc) - automatic gain control (agc) - image rejection mixer - frequency synthesizer with integrated vco - low-if direct conversion with no ceramic filters - analog or digital (i 2 s) outputs - 3.0 to 3.6 v supply voltage - programmable reference clock - aecq-100 certified ? ?40 to 85 oc operation - 24-pin 4 x 4 mm qfn package ? pb-free/rohs compliant applications - oem automotive radio systems - after-market automot ive radio systems - automotive radio modules
am/fm receiver copyright ? 2008 by silicon laboratories 10.23.08 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. si4740/41/42/43/44/45 automotive am/fm radio receiver selected electrical specifications 1 (v dd = 2.7 to 5.5 v, v io = 1.5 to 3.6 v, t a = ?40 to 85 c) parameter test condition min typ max unit fm input frequency 64 ? 108 mhz sensitivity (s+n)/n = 26 db ? 2 ? v emf rds sensitivity ? f = 2 khz, rds bler < 5% ? 8 ? v emf audio s/n (mono) 2,3 f mod = 1 khz, ? f = 22.5 khz, v emf = 60 dbv emf ? 63 ? db audio thd (mono) 2,3 f mod = 1 khz, ? f = 75 khz, v emf = 60 dbv emf ? 0.1 ? % input ip3 f 1 = 4000 khz; f 2 = 8000 khz ? 105 ? dbv emf audio output voltage ? 80 ? mvrms adjacent channel selectivity 200 khz ? 50 ? db alternate channel selectivity 400 khz ? 70 ? db am suppression 4 m = 0.3; ? f = 22.5 khz; f rf = 76 to 108 mhz; measured at v emf = 60 dbv emf ? 55 ? db audio stereo separation 4 f rf = 76 to 108 mhz; measured at v emf = 60 dbv emf ; ? f = 75 khz ? 45 ? db supply voltage 5 3 ? 3.6 v supply current 5 ? 26 ? ma am input frequency 520 ? 1710 khz sensitivity (s+n)/n = 26 db ? 28 ? v emf audio s/n 4,6 30% modulation, f mod =1 khz, rf level = 74 dbv emf; ? f = 22.5 khz ? 53 ? db audio thd 4,6 30% modulation, f mod =1 khz, rf level = 74 dbv emf; ? f = 22.5 khz ? 0.3 ? % input ip3 7 f 1 = 40 khz; f 2 = 80 khz ? 112 ? dbv audio output voltage 4 54 60 66 mvrms adjacent channel selectivity 10 khz ? 40 ? db alternate channel selectivity 20 khz ? 60 ? db notes: 1. specifications refer to si 474x application circuit input. 2. b af = 300 hz to 15 khz. 3. f rf = 76 to 108 mhz. 4. f mod = 1 khz, 75 s de-emphasis, mono = enabled, and l = r unless noted otherwise. 5. applies to both fm and am modes. 6. agc is disabled. 7. specification refers to si474x input. 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 dfs dout lout rout ami fmi nc sdio sclk gnd rfgnd agc1 gpo1/agc2 vdd nc nc gpo2/int gnd vio sen rst gpo3/dclk symbol millimeters min nom max a 0.80 0.85 0.90 a1 0.00 0.02 0.05 b 0.18 0.25 0.30 d 4.00 bsc d2 2.00 2.10 2.20 e 0.50 bsc e 4.00 bsc e2 2.00 2.10 2.20 l 0.30 0.40 0.50 aaa ? ? 0.10 bbb ? ? 0.10 ccc ? ? 0.08 ddd ? ? 0.10 eee ? ? 0.10 4x4x0.85mm 24-pin qfn package information
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