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