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)