Si4740/41/42/43/44/45 Automotive AM/FM Radio Receiver Description Features The Si474x receiver family applies 100% RF CMOS - Worldwide FM band support (64108 MHz) technology to bring digital low-IF radio technology to the - Worldwide AM band support (5201710 kHz) automotive receiver market. The Si474x receiver family - Shortwave, longwave support (Si4742/43/44/45 only) builds on Silicon Laboratories highly successful broadcast - Weather band support (Si4742/43 only) audio radio products, offering design simplicity, unmatched - Received signal quality indicators (RSSI, SNR, adjacent integration, programmability, and automotive quality and channel, wideband AM) reliability. - Multipath detection/mitigation The Si474x receiver family supports world-wide FM bands from 64108 MHz and AM bands from 5201710 kHz. The - AM and FM noise blankers (Si4742/43/44/45 only) Si474x supports AM/FM, weather band, shortwave, and - AM and FM programmable seek tuning longwave radio bands. All odd-numbered part numbers in - AM and FM programmable soft mute control the family support international RDS/RBDS protocols. - AM and FM adjustable channel bandwidth filters The Si474x family leverages Silicon Laboratories patented - FM stereo-mono blending digital architecture, delivering superior RF performance - FM Hi-Cut control (Si4742/43/44/45 only) and interference rejection. The proven digital radio - Digital FM stereo decoder technology provides excellent sensitivity in weak signal environments, and superb selectivity and inter-modulation - RDS/RBDS processor (Si4741/43/45 only) immunity in strong signal environments. - Automatic frequency control (AFC) The solution offers programmable AM/FM channel spacing - Automatic gain control (AGC) and filters, auto-calibrated digital tuning, and proven - Image rejection mixer AM/FM seek functionality based on multiple signal quality - Frequency synthesizer with integrated VCO and band parameters. The family offers highly flexible and - Low-IF direct conversion with no ceramic filters advanced audio features such as noise blanking, 2 programmable soft mute, and multi-path detection and - Analog or digital (I S) outputs mitigation. - 3.0 to 3.6 V supply voltage The Si474x receiver system has a minimal bill of materials - Programmable reference clock requiring a small amount of board space. The high level of - AECQ-100 certified integration provides a complete, tested broadcast audio 40 to 85 C operation receiver that is ideal for primary automotive radio receivers. - 24-pin 4 x 4 mm QFN package Pb-free/RoHS compliant Applications - OEM automotive radio systems - After-market automotive radio systems - Automotive radio modules Si474x RDS DOUT FMI DIGITAL LNA WEAK DFS AUDIO SIGNAL DCLK CONDITION AGC ADC DAC ROUT AMI LNA DSP GND ADC DAC LOUT AGC AGC GPO1-3 QUALITY 3.03.6 V VDD DETECTOR VIO LDO AFC CNTRL GND RST AM/FM Receiver Copyright 2008 by Silicon Laboratories 10.23.08 RCLK SEN SCLK SDIOSi4740/41/42/43/44/45 Automotive AM/FM Radio Receiver 1 Selected Electrical Specifications (V = 2.7 to 5.5 V, V = 1.5 to 3.6 V, T = 40 to 85 C) DD IO A 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 f = 1 kHz, f = 22.5 kHz, 2,3 MOD Audio S/N (Mono) 63 dB V = 60 dBV EMF EMF f = 1 kHz, f = 75 kHz, 2,3 MOD Audio THD (Mono) 0.1 % V = 60 dBV EMF EMF Input IP3 f = 4000 kHz f = 8000 kHz 105 dBV EMF 1 2 Audio Output Voltage 80 mVrms Adjacent Channel Selectivity 200 kHz 50 dB Alternate Channel Selectivity 400 kHz 70 dB m = 0.3 f = 22.5 kHz f = 76 to 108 MHz 4 RF AM Suppression 55 dB Measured at V = 60 dBV EMF EMF f = 76 to 108 MHz Measured at V = 4 RF EMF Audio Stereo Separation 45 dB 60 dBV f = 75 kHz EMF 5 Supply Voltage 3 3.6 V 5 Supply Current 26 mA AM Input Frequency 520 1710 kHz Sensitivity (S+N)/N = 26 dB 28 V EMF 30% modulation, f =1 kHz, 4,6 MOD Audio S/N 53 dB RF level = 74 dBV EMF f = 22.5 kHz 30% modulation, f =1 kHz, 4,6 MOD Audio THD 0.3 % RF level = 74 dBV EMF f = 22.5 kHz 7 Input IP3 f = 40 kHz f = 80 kHz 112 dBV 1 2 4 Audio Output Voltage 54 60 66 mVrms Adjacent Channel Selectivity 10 kHz 40 dB Alternate Channel Selectivity 20 kHz 60 dB Notes: 1. Specifications refer to Si474x application circuit input. 2. B = 300 Hz to 15 kHz. AF 3. f = 76 to 108 MHz. RF 4. F = 1 kHz, 75 s de-emphasis, MONO = enabled, and L = R unless noted otherwise. MOD 5. Applies to both FM and AM modes. 6. AGC is disabled. 7. Specification refers to Si474x input. Pin Assignments 4x4x0.85 mm 24-pin QFN Package Information Symbol Millimeters Min Nom Max A 0.80 0.85 0.90 24 23 22 21 20 19 A1 0.00 0.02 0.05 FMI 1 18 DFS b 0.18 0.25 0.30 RFGND 2 17 DOUT D 4.00 BSC AGC1 3 16 LOUT GND D2 2.00 2.10 2.20 PAD e 0.50 BSC NC 4 15 ROUT E 4.00 BSC GND 5 14 GND E2 2.00 2.10 2.20 AMI 6 13 VDD L 0.30 0.40 0.50 7 8 9 10 11 12 aaa 0.10 bbb 0.10 ccc 0.08 ddd 0.10 eee 0.10 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 RST NC NC SEN SCLK NC SDIO GPO1/AGC2 RCLK GPO2/INT VIO GPO3/DCLK