Si4712

Si4712/13-B30 FM RADIO TRANSMITTER WITH RECEIVE POWER SCAN Features Integrated receive power measurement Worldwide FM band support (76–108 MHz) Requires only two external components Frequency synthesizer with integrated VCO Digital stereo modulator Programmable pre-emphasis Analog/digital audio interface Audio silence detector Programmable reference clock RDS/RBDS encoder (Si4713 only) PCB loop and stub antenna support with self-calibrated capacitor tuning Programmable transmit level Audio dynamic range control Advanced modulation control 2.7 to 5.5 V supply voltage Integrated LDO regulator 3 x 3 x 0.55 mm 20-pin QFN Pb-free and RoHS Compliant Designed for compatibility with cellular operation Applications Cellular handsets/hands-free MP3 players Portable media players Wireless speakers/microphone Satellite digital audio radios Personal computers/notebooks Description The Si4712/13-B30 integrates the complete transmit functions for standards-compliant unlicensed FM broadcast stereo transmission. The chip also allows integrated receive power scanning to identify low signal power FM channels. Users must comply with local regulations on radio frequency (RF) transmission. Functional Block Diagram Si4712/13 Ordering Information: See page 34. Pin Assignments Si4712/13-B30 (Top View) NC GPO1 GPO2/INT GPO3/DCLK LIN NC 1 20 19 18 17 16 NC 2 15 RIN RFGND 3 TXO 4 GND PAD 14 DFS 13 DIN RST 5 12 GND 6 7 8 9 10 11 VDD SEN SCLK SDIO RCLK VIO Tx Ant TXO L1 120 nH RFGND ...