Description
The Si474x receiver family applies 100% RF CMOS technology to bring digital low-IF radio technology to the automotive receiver market. The Si474x receiver family builds on Silicon Laboratories’ highly successful broadcast audio radio products, offering design simplicity, unmatched integration, programmability, and automotive quality and reliability.
The Si474x receiver family supports world-wide FM bands from 64–108 MHz and AM bands from 520–1710 kHz. The Si474x supports AM/FM, weather band, shortwave, and longwave radio bands. All odd-numbered part numbers in the family support international RDS/RBDS protocols.
The Si474x family leverages Silicon Laboratories’ patented digital architecture, delivering superior RF performance and interference rejection. The proven digital radio technology provides excellent  sensitivity in weak signal environments, and superb selectivity and inter-modulation immunity in strong signal environments.

FEATUREs
- Worldwide FM band support (64–108 MHz)
- Worldwide AM band support (520–1710 kHz)
- Shortwave, longwave support (Si4742/43/44/45 only)
- Weather band support (Si4742/43 only)
- Received signal quality indicators (RSSI, SNR, adjacent channel, wideband AM)
- Multipath detection/mitigation
- AM and FM noise blankers (Si4742/43/44/45 only)
- AM and FM programmable seek tuning
- AM and FM programmable soft mute control
- AM and FM adjustable channel bandwidth filters
- FM stereo-mono blending
- FM Hi-Cut control (Si4742/43/44/45 only)
- Digital FM stereo decoder
- RDS/RBDS processor (Si4741/43/45 only)
- Automatic frequency control (AFC)
- Automatic gain control (AGC)
- Image rejection mixer
- Frequency synthesizer with integrated VCO
- Low-IF direct conversion with no ceramic filters
- Analog or digital (I²S) outputs
- 3.0 to 3.6 V supply voltage
- Programmable reference clock
- AECQ-100 certified
• –40 to 85 ºC operation
- 24-pin 4 x 4 mm QFN package
• Pb-free/RoHS compliant