Si4706 High-Performance FM RDS/RBDS Data Receiver Description antenna cables. The Si4706 is a 100% CMOS receiver integrated circuit (IC), offering the full receive functionality from antenna to RDS/RBDS data for use as a dedicated data receiver. It is an ideal RDS/RBDS data receiver for Traffic Message Channel (TMC) and Open Data Applications (ODA) applications frequently used in conjunction with GPS functionality. It offers a fullyintegrated decoder for the European RDS* and the North American RBDS. It includes demodulation, symbol decoding, advanced error correction, detailed visibility to block-error rates (BLER), and decoder reliability, synchronization status, and times. The Si4706 provides complete, decoded, and errorcorrected RDS groups, up to 25 groups at a time in four 16-bit registers. The Si4706 is feature-rich, providing both highly automated performance, according to Silicon Laboratories' recommended settings, and extensive programmability and flexibility for customized system performance. *Note: The term “RDS” will be used to mean “RDS/ RDBS” throughout this document. Features - Worldwide FM band support (76–108 MHz) - Advanced RDS decoding engine - Unmatched RDS sensitivity - Leading RDS synchronization metrics - Highly reliable RDS decode - RDS reception with FM mono broadcast - Received signal quality indicators - Supports integrated antenna - Automatic gain control (AGC) - Integrated FM LNA - Image-rejection mixer - Frequency synthesizer with integrated VCO - Low-IF direct conversion with no external ceramic filters - 2.7 to 5.5 V supply voltage - Programmable reference clock - 20-pin 3 x 3 mm QFN package - Pb-free/RoHS compliant - Stereo audio OUT The Si4706 incorporates a high performance RDS decoder based on patented methodologies and delivers excellent RDS sensitivity performance, synchronization to RDS at high BLER levels, and RDS data decoding with superior decoder reliability. The Si4706 draws on Silicon Laboratories' broadcast audio and corresponding patent portfolio using a digital low intermediate frequency (low-IF) receiver architecture proven by over 100 million broadcast audio receivers shipped worldwide. The low-IF architecture allows the Si4706 to deliver superior performance while integrating the great majority of external components required by competing solutions. The Si4706 is the first FM radio receiver integrated circuit to support an embedded antenna, which can be integrated into the enclosure or PCB of a portable device. For portable navigation devices, the Si4706 embedded antenna feature permits integration of the traffic messaging antenna into the enclosure of the portable device and eliminates the need for external - I2S Digital audio OUT Applications - Personal navigation devices (PND) - Dedicated data receiver - GPS-enabled portable devices Headphone Cable Si4706 ADC FMI DAC ROUT 0/90 RSSI RDS AFC VDD CONTROL INTERFACE SEN XTAL OSC DIGITAL INTERFACE AGC REG FM Data Receiver LOUT GPO DCLK DOUT DFS VIO 2.7–5.5 V ADC RST 32.768 kHz (TYP) RCLK DAC DSP SDIO LPI PGA SCLK RFGND Integrated Antenna LNA Copyright © 2008 by Silicon Laboratories 03.17.08 Si4706 High-Performance FM RDS/RBDS Data Receiver Selected Electrical Specifications Parameter Test Condition Min Typ Max Unit Input Frequency 76 108 MHz Frequency Steps 10 200 kHz RDS Sensitivity ∆f = 2 kHz, RDS BLER < 5% 8 µV emf 400 and 800 kHz blockers 99 dBµV emf 55 dB 50 dB Input IP3 Image Rejection Adjacent Channel Selectivity ±200 kHz Alternate Channel Selectivity ±400 kHz 70 Audio Mono S/N 55 Audio THD dB 63 — dB — 0.1 0.5 % RCLK Frequency 31.13 32.768 40,000 kHz RCLK Tolerance –100 100 ppm 3 5.5 V Supply Voltage Interface Supply Voltage 1.5 Supply Current Ambient Temperature 85 C RCLK tolerance = 100 ppm 60 ms/channel From powerdown 110 ms Powerup Time 20 19 18 17 16 FMI 2 15 DOUT RFGND 3 14 LOUT GND PAD LPI 4 13 ROUT RST 5 12 GND 10 11 VDD VIO 9 RCLK 8 SDIO 7 SCLK SEN 6 Package Information DFS GPO3/DCLK GPO2/INT GPO1 NC Pin Assignments 1 V mA –20 Seek/Tune Time NC 3.6 22 Symbol Millimeters Nom Max Millimeters Min Nom Max A 0.50 0.55 0.60 f A1 0.00 0.02 0.05 L 0.35 0.40 b 0.18 0.25 0.30 L1 0.00 — 0.10 c 0.27 0.32 0.37 aaa — — 0.10 D D2 3.00 BSC 1.60 1.70 1.80 2.53 BSC 0.45 bbb — — 0.10 ccc — — 0.08 e 0.50 BSC ddd — — 0.10 E 3.00 BSC eee — — 0.10 E2 Notes: 1. 2. FM Data Receiver Symbol Min 1.60 1.70 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 03.17.08 Smart. Connected. Energy-Friendly Products Quality Support and Community www.silabs.com/products www.silabs.com/quality community.silabs.com Disclaimer Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical" parameters provided can and do vary in different applications. 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