The Si4825 is the entry level mechanical-tuned digital CMOS AM/FM/SW radio

receiver IC that integrates the complete receiver function from antenna input to
audio output. The Si4825 extends Silicon Laboratories multi-band tuner family,
and further increases the ease and attractiveness of design radio reception to
audio devices through small size and board area, minimum component count, and
superior, proven performance. The Si4825 requires a simple application circuit
and removes any requirements for manually tuning components during the
manufacturing process. The receiver has very low power consumption, runs off
two AAA batteries, and delivers the performance benefits of digital tuning to the
analog radio market.
Functional Block Diagram
 Worldwide FM band support
(64–109 MHz)
 Worldwide AM band support
(504–1750 kHz)
 SW band support
(2.3–28.5 MHz)
 No manual alignment necessary
 Mono audio output
 Selectable support AM/FM/SW
regional bands
 Enhanced FM/SW band coverage
 Automatic frequency control (AFC)
 Integrated LDO regulator
 2.0 to 3.6 V supply voltage
 Wide range of ferrite loop sticks and
air loop antennas supported
 16-pin SOIC
 RoHS-compliant
 Direct volume control
 Not EN55020 compliant*
*Note: For consumer applications that
require EN 55020 compliance,
use Si483x.
 Table and portable radios
 Mini/micro systems
 CD/DVD players
 Boom boxes
 Modules
 Clock radios
 Mini HiFi
 Entertainment systems