Si4712/13 FM Radio Transmitter with Receive Power Scan Description Features The Si4712/13 is the industry's first 100% CMOS FM radio transmitter with an integrated receiver to measure receive signal strength. The device leverages Silicon Labs’ highly successful and proven Si4700/01 FM receiver, and offers unmatched integration and performance allowing FM transmit to be added to any portable device by using a single chip. As with the Si4700/01, the Si4712/13 offers industry leading size, performance, low power consumption, and ease of use. - Integrated receiver for receive power measurement - Worldwide FM band support (76–108 MHz) for transmit - Requires only two external components - Frequency synthesizer with integrated VCO - Digital stereo modulator - Programmable pre-emphasis (50/75 µs) - Analog/digital audio interface - Programmable reference clock - RDS/RBDS transmit encoder (Si4713 only) - PCB loop antenna support with self calibrated capacitor tuning - Programmable transmit level - Programmable modulation - 2.7 to 5.5 V supply voltage - Digital gain compression - Integrated LDO regulator - 3 x 3 x 0.55 mm 20-pin QFN - Pb-free and RoHS Compliant The Si4712/13’s digital integration reduces the required external components of traditional offerings, resulting in a solution requiring only an external inductor and bypass capacitor, and PCB space of approximately 15 mm2. High reliability in device manufacturing, improved quality, easy design-in, and software programmability are key advantages of the Si4712/13. The Si4713 supports the European Radio Data System (RDS) and the US Radio Broadcast Data System (RBDS) standards including all the symbol encoding, block synchronization, and error correction functions. Using this feature, the Si4713 enables data such as artist name and song title to be transmitted to an RDS/RBDS receiver. Users are responsible for adjusting their system’s radiated power levels to comply with local regulations on RF transmission (FCC, ETSI, ARIB, etc.). Applications - Cellular handsets/hands-free MP3 players Portable audio/video players Wireless speakers/microphone Satellite digital audio radios Personal computers/notebooks Si4712/13 PEAK DETECT DIN DIGITAL AUDIO DFS DAC ADC LIN DAC ADC RIN DSP GPO2/ INT GPO1 GPO RDS (Si4713) SEN SCLK RST SDIO CONTROL INTERFACE AFC GPO3/ DCLK RFGND VIO L1 120 nH TXO RCLK Tx Ant VDD 2.7–5.5 V LDO GND C1 22 nF Si4712/13 FM Radio Transmitter with Receive Power Scan Selected Electrical Specifications Parameter Symbol Min Typ Max Unit 76 — 108 MHz — 118 — dBµV –2.5 — 2.5 dB Transmit Voltage Step — 1 2 dB Transmit Channel Edge Power — — –20 dBC Transmit Frequency Range Test Condition fRF Programmable Transmit Output Voltage, TXO Transmit Voltage Accuracy VRF = 102–118 dBµV Transmit Adjacent Channel Power — –30 –26 dBC TX_PREMPHASIS = 75 µs 70 75 80 µs TX_PREMPHASIS = 50 µs 45 50 54 µs — 63 — dB Audio THD Mono — 0.1 0.5 % Audio Stereo Separation 30 35 — dB SCR 40 50 — dB VAI — — 0.636 Vpk Audio Bandwidth (3 dB) 30 — 15 k Hz Audio Imbalance –1 — 1 dB — — 110 ms 2.7 — 5.5 V Pre-Emphasis Time Constant Audio SNR Mono Sub Carrier Rejection Ratio Input Signal Level (0 dB) Powerup Settling Time From Powerdown Supply Voltage VDD Interface Supply Voltage VIO TX Supply Current ITX TX Interface Supply Current IIO FM TX from Line Input NC 1 3.6 V 18.8 22.8 mA — 320 600 µA Package Information 20 19 18 17 16 NC 2 15 RIN RFGND 3 14 DFS GND PAD TXO 4 13 DIN 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 FM Tuner — — LIN GPO3/DCLK GPO2/IRQ GPO1 NC Pin Assignments 1.5 Min 0.50 0.00 0.20 0.27 1.65 1.65 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 1.75 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 0.05 0.05 0.08 0.10 0.10 1.75 Copyright © 2008 by Silicon Laboratories Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc. 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