Description
The Si4720/21 integrates the complete tuner and transmit functions for FM broadcast reception and standards-compliant, unlicensed FM broadcast stereo transmission. Users must comply with local radio frequency (RF) transmission regulations.

FEATUREs
■ Full FM RX and TX in 3 x 3 QFN
■ Worldwide FM RX band support
■ Compliant with worldwide FM TX regulations
■ Excellent real-world performance
■ Supports integrated TX/RX antenna
■ Programmable transmit output voltage
■ Frequency synthesizer with integrated VCO
■ Integrated LDO regulator
■ Minimal BOM (15 mm2)
■ Digital audio output (Si4721 only)
■ Digital audio input
■ Adjustable seek parameters
■ Adjustable mono/stereo blend
■ Adjustable soft mute
■ Advanced modulation control
■ Audio dynamic range control
■ Audio silence detector
■ Programmable reference clock input
■ 2-wire and 3-wire control interface
■ 2.7 to 5.5 V supply voltage
■ 3 x 3 x 0.55 mm 20-pin Pb-free QFN package
■ RDS/RDBS encoder/decoder (Si4721 only)

APPLICATIONs
■ Cellular handsets/hands-free
■ MP3 players
■ Portable media players
■ Wireless speakers/microphone
■ Satellite digital audio radios
■ Personal computers/notebooks