SI4711

Si4710/11 FM Radio Transmitter for Portable Applications Description 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. 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) 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 to adjust their system’s radiated power levels to comply with local regulations on RF transmission (FCC, ETSI, ARIB, etc.). Features - 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 Applications Cellular handsets/hands-free MP3 players Portable audio/video players Wireless speakers/microphone Satellite digital audio radios Personal computers/notebooks DFS DIN LIN ADC DIGITAL AUDIO DAC DSP Si471x TXO DAC RFGND Tx Ant L1 120 nH RIN ADC 2. 7– 5.5 V VDD GND LDO C1 22 nF GPO RDS (Si4711) CONTROL INTERFACE AFC SDIO SCLK VIO GPO2/IRQ FM Tuner Copyright © 2007 by Silicon Laboratories GPO3/DCLK RCLK GPO1 SEN RST 1.8.07 Si4710/11 FM Radio Transmitter for Portable Applications Selected Electrical Specifications Parameter Transmit Frequency Range Programmable Transmit Output Voltage, TXO (Maximum Voltage) Programmable Transmit Output Voltage, TXO (Minimum Voltage) Transmit Voltage Stability Transmit Voltage Step Transmit Channel Edge Power Transmit Adjacent Channel Power Pre-emphasis Time Constant Audio SNR Audio THD Audio Stereo Separation Sub Carrier Rejection Ratio Input Signal Level (0 dB) Audio Bandwidth (3 dB) Audio Imbalance Powerup Settling Time From powerdown SCR VAI 0.6 VRMS input, VIO = 1.8 V FMPE[1:0] = 00 FMPE[1:0] = 01 Symbol fRF Test Condition Min 76 — — –1 — — — 70 45 — — 30 — — 20 –1 — Typ — 115 83 — 1 — –30 75 50 63 0.1 35 –50 — — — 110 Max 108 — — 1 2 –20 –26 80 54 — 0.5 — –40 0.636 15 K 1 — Unit MHz dBµV dBµV dB dB dBC dBC us us dB % dB dB Vpk Hz dB ms Pin Assignments GPO3/DCLK GPO2/IRQ GPO1 Package Information NC 1 20 19 18 17 16 15 RIN NC 2 RFGND 3 TXO 4 RST 5 6 SEN 7 SCLK 8 SDIO 9 RCLK GND PAD 10 11 VDD VIO Symbol A A1 b c D D2 e E E2 Min 0.50 0.00 0.20 0.27 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 — — — — — — LIN 14 DFS 13 DIN 12 GND NC Max 0.45 0.10 0.05 0.05 0.08 0.10 0.10 1.65 1.75 FM Tuner Copyright © 2007 by Silicon Laboratories 1.8.07 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