This is an evaluation board for the Silicon Laboratories Si4703 FM
Beyond being a simple FM radio, the Si4703 is also capable of
detecting and processing both Radio Data Service
(RDS) and Radio
Broadcast Data Service (RBDS) information. The Si4703 even does a very
good job of filtering and carrier detection. It also enables data such
as the station ID and song name to be displayed to the user.
Using this board we are able to pick up multiple stations just as well
as with a standard FM radio. The board breaks out all major pins and
makes it easy to incorporate this great chip into your next radio
project. Also, by plugging headphones into the 3.5mm audio jack, you
effectively use the cable in your headphones as an antenna! Therefore,
this board does not require an external antenna if using headphones or
a 3.5mm audio cable longer than 3 feet.