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The Si4730/31 is the industry's
first fully integrated, 100% CMOS AM/FM radio receiver IC.
Offering unmatched integration and PCB space savings, the
Si4730/31 only requires two external components and less than
15 mm² of board area excluding the antenna inputs. The
Si4730/31 AM/FM radio provides the space savings and low power
consumption necessary for portable devices while delivering
high performance and design simplicity desired for all AM/FM
solutions.
Leveraging Silicon Laboratories' proven and
patented Si4700/01 FM tuner's digital low intermediate
frequency (low-IF) receiver architecture, the Si4730/31
delivers superior RF performance and interference rejection in
both AM and FM bands. Digital signal processing is utilized to
provide optimum sound quality signal under varying reception
conditions, and the high integration and complete system
production test simplifies design-in, increases system
quality, and improves manufacturability.
The Si4730/31 is a feature-rich solution
including advanced seek algorithms, soft mute, auto-calibrated
digital tuning, and FM stereo processing. In addition, the
Si4730/31 provides analog or digital audio output and a
programmable reference clock. The device supports
I²C-compatible 2-wire control interface, and a Si4700/01
backwards-compatible 3-wire control interface.
The Si4730/31 utilizes digital processing
to achieve high fidelity, optimal performance, and design
flexibility. The on-chip DSP provides excellent pilot
rejection, selectivity, and unmatched audio performance. The
on-chip micro-controller offers both the manufacturer and the
end-user extensive programmability and flexibility in
listening experience.
The Si4731 incorporates a digital processor
for the European Radio Data System (RDS) and the North
American Radio Broadcast Data System (RBDS) including all
required symbol decoding, block synchronization, error
detection, and error correction functions. Using this feature,
the Si4731 enables broadcast data such as station
identification and song name to be displayed to the user.
Si473x Block Diagram | 
