Si4736/7/8/9 Broadcast AM/FM/WB Radio Receiver Description The Si4736/37 and Si4738/39 are the industry's first fully integrated, 100% CMOS AM/FM/WB and FM/ WB radio receiver ICs. Offering unmatched integration and PCB space savings, the Si4736/37/ 38/39 requires only two external components and less than 15 mm2 of board area, excluding the antenna inputs. The Si4736/37/38/39 AM/FM/WB 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/WB solutions. Leveraging Silicon Laboratories' proven and patented Si4700/01 FM tuner's digital low intermediate frequency (low-IF) receiver architecture, the Si4736/37/38/39 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 Si4736/37/38/39 is a feature-rich solution including 1050 Hz tone detection, advanced seek algorithms, soft mute, auto-calibrated digital tuning, and FM stereo processing. In addition, the Si4736/ 37/38/39 provides analog and digital audio outputs and a programmable reference clock. The device supports I2C-compatible, 2-wire control interface, SPI, and a Si4700/01 backwards-compatible, 3-wire control interface. The Si4736/37/38/39 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 Si4737/39 incorporates a digital processor for the European Radio Data System (RDS) and the North American Radio Broadcast Data System (RBDS), and includes all required symbol decoding, block synchronization, error detection, and error correction functions. Using this feature, the Si4737/ 39 enables broadcast data such as station identification and song name to be displayed to the user. Features - Weather band support (162.4–162.55 MHz) - Worldwide FM band support (76–108 MHz) - Worldwide AM band support (520–1710 kHz) - (Si4736/7) 1050 Hz tone detection AM/FM/WB digital tuning No manual alignment necessary Excellent real-world performance Dynamic 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 de-emphasis Integrated LDO regulator Programmable reference clock FM RDS/RBDS processor (Si4736/7) 2-wire and 3-wire control interface 2.7 to 5.5 V supply voltage 3 x 3 x 0.55 mm 20-pin QFN package - Pb-free/RoHS compliant Applications - Emergency radios Table and portable radios Stereos Mini/micro systems Portable media players Handsets Boom boxes Clock radios Si473x AMI LNA AGC LOW-IF ADC 2.7– 5.5 V ADC VDD LDO AFC RCLK GND AM/FM/WB Receiver DFS GPO/DCLK DAC ROUT DAC LOUT CONTROL INTERFACE SEN AGC DOUT DSP SCLK FMI LNA DIGITAL AUDIO (Si4737/ 39) VIO 1.5–3.6 V RST FM/ WB ANT RFGND SDIO AM ANT RDS (Si4737/ 39) Copyright © 2008 by Silicon Laboratories 01.7.08 Si4736/7/8/9 Broadcast AM/FM/WB Radio Receiver Selected FM Electrical Specifications Parameter Symbol Test Condition Input Frequency fRF Sensitivity headphone matching (S+N)/N = 26 dB Sensitivity 50 matching (S+N)/N = 26 dB Input IP3 |f2 – f1| > 1 MHz; f0 = 2 x f1 – f2 Adjacent Channel Selectivity ±200 kHz Alternate Channel Selectivity ±400 kHz Audio Mono S/N Audio THD Audio Output Voltage Supply Voltage* VD, VA Interface Supply Voltage* VIO Powerdown Current* IPD *Note: Applies to AM, FM, and WB modes. Min 76 — — — — — — — 72 2.7 1.5 — Typ — 2.2 1.1 105 50 70 63 0.1 80 — — 10 Max 108 — — — — — — — 90 5.5 3.6 — Unit MHz µV EMF µV EMF dBµV EMF dB dB dB % mVrms V V µA WB Receiver Characteristics Parameter Input Frequency Sensitivity Adjacent Channel Selectivity Audio S/N Symbol fR Test Condition SINAD = 12 dB +/-25 kHz Mono Min 162.4 — — — Typ — 1.2 55 45 Max 162.55 — — — Unit MHz µV EMF dB dB Selected AM Electrical Specifications Parameter Input Frequency Sensitivity Audio S/N Audio THD Audio Output Voltage Pin Assignments Symbol fRF Test Condition Medium wave (AM) (S+N)/N = 26 dB Min 520 — — — 54 Typ — 25 56 0.1 60 Max 1710 — — — 66 3 x 3 x 0.55 mm, 20-pin QFN Package Information GPO1 GPO2/INT GPO3/DCLK DFS 1 NC Symbol NC 20 19 18 17 16 FMI 2 A A1 b c D D2 e E E2 f L L1 aaa bbb ccc ddd eee 15 DOUT FGND 3 14 LOUT GND PAD AMI 4 13 ROUT 6 7 8 9 10 SEN SDIO RCLK VIO 12 GND SCLK RST 5 AM/FM/WB Receiver Unit kHz µV EMF dB % mVrms 11 VDD Millimeters Min Nom Max 0.50 0.55 0.60 0.00 0.02 0.05 0.18 0.25 0.30 0.27 0.32 0.37 3.00 BSC 1.60 1.70 1.80 0.50 BSC 3.00 BSC 1.60 1.70 1.80 2.53 BSC 0.35 0.40 0.45 0.00 — 0.10 — — 0.10 — — 0.10 — — 0.08 — — 0.10 — — 0.10 Copyright © 2008 by Silicon Laboratories Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc. 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