Si4704/05 Enhanced Broadcast FM Radio Receiver for Portable Applications Description FM transmit, AM/FM/SW receive, weather band receive and SAME decode, and unparalleled RDS data receivers. The complete solution, including a minimal BOM, requires less than 15 mm2 board area, or less than half that of other competing solutions. The Si4705 incorporates Silicon Labs' proven and widely adopted RDS processor, including worldwide compliance, all symbol decoding, error detection, error correction, and other RDS functions. The Si4705 RDS functionality is unmatched in the industry for performance, on-chip processing, and worldwide adoption. The Si4704/05 enhanced FM receiver is the most advanced portable solution available today offering embedded antenna support, digital audio out, worldwide FM band support, and highly flexible, mature, and proven FM functionality in a simple API. The Si4704/05 incorporates Silicon Labs' tuned-resonance antenna technology for crystal clear FM reception in wire-free device enclosures. Silabs' internationally patented tunedresonance technology allows embedded FM antennas such as PCB traces, loops, stubs, or other devices to perform exceptionally well, enabling devices with integrated Bluetooth to receive FM transmissions without an external FM antenna, and transmit the FM content to Bluetooth-enabled headsets. This is the best, most costeffective solution to enable wire-free FM reception. The Si4705 also offers digital audio out for FM recording. Content recorded over the Si4705 can be shared with friends or played at a later time in MP3 format. The content can also be tagged with RDS information, allowing song name and artist labels to be displayed as is done with MP3 meta data. Using the digital audio out, the Si4705 can also reduce total system power consumption by avoiding unnecessary ADC/DAC conversions between the FM receiver and the host processor. The Si4704/05 truly supports worldwide FM bands, starting at 64 MHz for Eastern European countries and extending all the way to 108 MHz for the rest of the world. The device supports channel spacing down to 10 kHz, and includes advanced, proven seek functionality. All the Silicon Labs proven FM receiver expertise is incorporated in the Si4704/ 05, gained through thousands of designs with almost every OEM and ODM in the world and over 100 million devices shipped. The Si4704/05 leverage Silicon Labs' internationally patented and proven digital low-IF architecture, offering proven functionality in a simple and mature API. The device is offered in a highly reliable, ultra-small 3 x 3 x 0.55 mm 20-pin QFN and is layout compatible with the full suite of Silicon Labs broadcast offerings including Features - Worldwide FM band support (64~108 MHz) Supports integrated antenna Digital low-IF receiver Excellent real-world performance Frequency synthesizer with integrated VCO Seek tuning Automatic frequency control (AFC) Automatic gain control (AGC) Integrated LDO regulator Minimal BOM Adjustable seek parameters Adjustable mono/stereo blend Adjustable soft mute RDS/RBDS decoder(Si4705 only) Optional digital audio output (Si4705 only) Programmable de-emphasis(50/75us) Programmable reference clock input Signal quality measurement 3 x 3 x 0.55 mm 20-pin Pb-free QFN package Applications - Cellular handsets MP3 players Portable media players Personal computers Portable navigation devices Consumer electronics Headphone Cable Si4704/05 ADC FMI LNA PGA 0/90 RSSI AFC FM Tuner GPO DCLK DOUT DFS VIO RST CONTROL INTERFACE XTAL OSC SEN REG RDS (Si4705) SDIO VDD SCLK 2.7–5.5 V ROUT AGC 32.768 kHz RCLK DAC DSP ADC LPI LOUT DIGITAL INTERFACE (Si4705) RFGND DAC Copyright © 2008 by Silicon Laboratories 4.02.08 Si4704/05 Enhanced Broadcast FM Radio Receiver for Portable Applications Selected Electrical Specifications Parameter Symbol Input Frequency Test Condition Min fRF Typ Max Unit 64 — 108 MHz (S+N)/N = 26 dB — 1.1 — µV EMF |f2 – f1| > 1 MHz; f0 = 2 x f1 – f2 AGC disabled — 105 — dBµV EMF Adjacent Channel Selectivity ±200 kHz — 50 — dB Alternate Channel Selectivity ±400 kHz — 70 — dB — 32.768 — kHz Sensitivity (76–108 MHz) Input IP3 RCLK Frequency RCLK Frequency Tolerance –100 — 100 ppm Audio Output Voltage 72 80 90 mVrms Audio Mono S/N 55 63 — dB Audio THD — 0.1 0.5 % VD, VA 2.7 — 5.5 V VIO 1.5 — 3.6 V Ambient Temperature TA –20 25 85 C Supply Current IAD — 19.2 — mA Powerdown Current IPD — 10 12 µA — — 80 ms/channel Supply Voltage Interface Supply Voltage Seek/Tune Time SCLK Frequency fCLK 3-wire operation — — 2.5 MHz fSCL 2-wire operation — — 400 kHz From powerdown — — 110 ms Powerup Time Package Information NC 1 DFS GPO3/DCLK GPO2/INT GPO1 NC Pin Assignments 20 19 18 17 16 FMI 2 15 DOUT RFGND 3 14 LOUT GND PAD LPI 4 13 ROUT 7 8 9 SDIO RCLK 10 11 VDD VIO 6 SCLK 12 GND SEN RST 5 Symbol A A1 b c D D2 e E E2 Notes: 1. 2. FM Tuner Min 0.50 0.00 0.18 0.27 1.60 1.60 Millimeters Nom 0.55 0.02 0.25 0.32 3.00 BSC 1.70 0.50 BSC 3.00 BSC 1.70 Symbol Max 0.60 0.05 0.30 0.37 1.80 Min f L L1 aaa bbb ccc ddd eee 0.35 0.00 — — — — — Millimeters Nom 2.53 BSC 0.40 — — — — — — Max 0.45 0.10 0.10 0.10 0.08 0.10 0.10 1.80 All dimensions are shown in millimeters unless otherwise noted. Dimensioning and tolerancing per ANSI Y14.5M-1994. Copyright © 2008 by Silicon Laboratories 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 4.02.08 Smart. Connected. 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