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 The Si473x and Si4707 devices are the industry's first fully integrated, 100% CMOS AM/FM/SW/LW and WB radio receiver ICs. Offering unmatched integration and PCB space savings, the Si47xx only requires two external components and less than 15 mm² of board area excluding the antenna inputs. The Si47xx receiver provides the space savings and low power consumption necessary for portable devices while delivering high performance and design simplicity desired for all multi-band radio solutions.
 Si4730/31 - AM/FM radio receivers
Si4734/35 - AM/FM/shortwave/longwave radio receivers
Si4736/37 - AM/FM/weather band radio receivers
Si4738/39 - FM/weather band radio receivers
Si4707 - Weather band radio receiver with Specific Area Message Encoding (SAME) decoder
 Leveraging Silicon Labs' proven digital low intermediate frequency (low-IF) receiver architecture, the Si473x delivers superior RF performance and interference rejection in AM, FM, SW, LW and weather 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 Si473x is a feature-rich solution including advanced seek algorithms, soft mute, auto-calibrated digital tuning and FM stereo processing. In addition, the Si473x provides analog or digital audio output and a programmable reference clock. The device supports I²C-compatible 2-wire and 3-wire control interface.
The Si473x 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 microcontroller offers both the manufacturer and the end-user extensive programmability and flexibility in listening experience.
The Si4731/35/37/39 incorporate 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 Si4731/35/37/39 enable broadcast data such as station identification and song name to be displayed to the user.
The Si4707 offers dedicated weather band audio plus Specific Area Message Encoding (SAME). The solution is layout compatible to the Si47xx family.
Si473x Block Diagram
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