Si4710/11 FM Radio Transmitter for Portable Applications Description Features The Si4710/11 is the industry's first 100% CMOS FM transmitter single chip IC. 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 Si4710/11 offers industry leading size, performance, low power consumption, and ease of use. - 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 (Si4711 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 Si4710/11’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 Si4710/11. The Si4711 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 Si4711 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 - Si4710/11 DIGITAL AUDIO DFS DIN LIN ADC DAC TXO DSP FM Tuner RFGND L1 120 nH AFC VIO RST SDIO CONTROL INTERFACE SCLK GPO ( i4711 ) RDS S GPO1 LDO SEN GND C1 22 nF GPIO3/DCLK VDD GPIO2/INT 2.7–5.5 V DAC Copyright © 2008 by Silicon Laboratories RCLK ADC RIN Tx Ant 4.3.08 Si4710/11 FM Radio Transmitter for Portable Applications Selected Electrical Specifications Parameter Transmit Frequency Range Programmable Transmit Output Voltage, TXO Transmit Voltage Accuracy Transmit Voltage Step Transmit Channel Edge Power Transmit Adjacent Channel Power Symbol fRF Min 76 Typ — Max 108 Unit MHz — 118 — dBµV TXPREMPHASIS = 75 µs TXPREMPHASIS = 50 µs –2.5 — — — 70 45 — — 30 40 — 1 — –30 75 50 63 0.1 35 50 2.5 2 –20 –26 80 54 — 0.5 — — dB dB dBC dBC µs µs dB % dB dB 0.6 VRMS input, VIO = 1.8 V — — 0.636 Vpk 30 –1 — — — — 15 K 1 110 Hz dB ms 2.7 — 5.5 V VRF = 102–118 dBµV Pre-emphasis Time Constant Audio SNR Mono Audio THD Mono Audio Stereo Separation Sub Carrier Rejection Ratio Test Condition SCR Input Signal Level (0 dB) VAI Audio Bandwidth (3 dB) Audio Imbalance 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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