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3.7.2 AM Radio module (Si4703x)
Figure. 3-7-2 Si4703-B20 FM Receiver Block Diagram
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 requires only 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 the 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. 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 that includes advanced seek algorithms, soft mute,
auto-calibrated digital tuning, and FM stereo processing. In addition, the Si4730/31 provides
analog and digital audio outputs and a programmable reference clock. The device
supports I2C-compatible 2-wire control interface, SPI, and a Si4700/01 backwards-compatible
3-wire control interface.
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