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| SI4720/21 Broadcast FM Radio Transceiver for Portable Applications Description The SI4720/21 is the first single chip FM radio transceiver. The proven and patented digital architecture of the SI4720/ 21 combines the functionality of the Si470x FM radio receiver with the Si471x FM transmitter, offering full FM receive and transmit capabilities in a single, ultra-small 3x3x0.55 mm QFN package. The device leverages Silicon Lab's highly successful and proven FM technology, and offers unmatched integration and performance allowing FM receive and transmit to be added to any portable device by using a single chip. As with the Si470x and Si471x products, the SI4720/21 offers industry leading size, performance, low power consumption, and ease of use. The SI4720/21's digital integration reduces the required external components of traditional offerings, resulting in a solution requiring only an external inductor and bypass capacitor, and a PCB space of approximately 15 mm2. The SI4720/21 is layout compatible with Silicon Laboratories' Si470x FM radio receivers, Si473x AM/FM radio receivers, and the Si471x FM radio transmitter solutions, allowing a single PCB layout to accommodate a variety of music features. High yield manufacturability, unmatched performance, easy design-in, and software programmability are key advantages of the SI4720/21. The Si4721 is the industry's first single-chip integrated FM radio transceiver including both receive and transmit support for the European Radio Data System (RDS) and the U.S. Radio Broadcast Data System (RBDS). RDS allows digital information sent from the broadcaster to be displayed, such as station ID, song name and music category. In Europe, alternate frequency (AF) information is also provided to automatically change stations in areas where broadcasters use multiple frequencies. In transmit mode, digital information such as artist name, song title, music category, and branded messaging can be transmitted and displayed on any 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 Integrated FM antenna support Excellent real-world performance Only two external components required Worldwide FM band support (76 to 108 MHz) RDS/RBDS processor (Si4721) Frequency synthesizer with integrated VCO Adjustable seek parameters Adjustable mono/stereo blend Adjustable soft mute Programmable transmit output voltage control Audio dynamic range control Advanced modulation control Analog/digital audio interface Programmable reference clock input Programmable pre/de-emphasis (50/75 s) 2-wire and 3-wire control interface Integrated LDO regulator 2.7 to 5.5 V supply voltage 3x3x0.55 mm 20-pin Pb-free QFN package Cellular handsets/hands free MP3 players Portable media players GPS/navigation devices Satellite digital audio radios Personal computers Applications Si472x TX Ant L1 120 uH TXO LIN /DFS RIN /DIO RX Ant FMI RFGND ADC PGA MUX LNA AGC DSP ADC DAC ROUT /DIO LOUT /DFS DAC 2.7-5.5 V VDD C1 22 uF GND LDO AFC RDS (Si4721) GPO CONTROL INTERFACE GPO2 SCLK RCLK GPO1 SEN RST FM Transceiver Copyright (c) 2007 by Silicon Laboratories GPO3/DCLK SDIO VIO 1.18.07 SI4720/21 Broadcast FM Radio Transceiver for Portable Applications Selected Electrical Specifications Parameter Frequency Range Sensitivity Input IP3 Adjacent Channel Selectivity Alternate Channel Selectivity RX Audio Output Voltage RX Audio Band Limits RX Audio S/N RX Audio THD 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/de-emphasis Time Constant TX Audio SNR TX Audio THD TX Audio Stereo Separation TX Sub Carrier Rejection Ratio TX Audio Input Signal Level (0 dB) Symbol fRF Test Condition (S+N)/N = 26 dB |f2 - f1| > 1 MHz; f0 = 2 x f1 - f2 AGC disabled 200 kHz 400 kHz 1.5 dB Min 76 -- -- -- -- 72 30 -- -- -- -- -1 -- -- -- 70 45 -- -- 30 -- -- Typ -- 2.2 108 50 70 80 -- 63 0.1 115 83 -- 1 -- -30 75 50 63 0.1 35 -50 -- Max 108 -- -- -- -- 90 15k -- -- -- -- 1 2 -20 -26 80 54 -- -- -- -40 0.636 Unit MHz V EMF dBV EMF dB dB mVrms Hz dB % dBV dBV dB dB dBC dBC us us dB % dB dB Vpk FMPE[1:0] = 00 FMPE[1:0] = 01 SCR VAI VIO = 1.8 V Pin Assignments GPO3/DCLK LIN/DFS GPO1 GPO2 Package Information NC 1 FMI 2 RFGND 3 TXO 4 RST 5 6 SEN 7 SCLK 8 SDIO 9 RCLK NC 20 19 18 17 16 15 RIN/DIO GND PAD 14 LOUT/DFS 13 ROUTDIO 12 GND 10 11 VDD VIO Symbol A A1 b c D D2 e E E2 Min 0.50 0.00 0.18 0.27 Millimeters Nom 0.55 0.02 0.25 0.32 3.00 BSC 1.60 1.70 0.50 BSC 3.00 BSC 1.60 1.70 Symbol Max 0.60 0.05 0.30 0.37 1.80 f L L1 aaa bbb ccc ddd eee Millimeters Nom 2.53 BSC 0.35 0.40 0.00 -- -- -- -- -- -- -- -- -- -- -- Min Max 0.45 0.10 0.10 0.10 0.08 0.10 0.10 1.80 FM Transceiver Copyright (c) 2007 by Silicon Laboratories 1.18.07 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 |
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