Si4707 Weather Band Radio Receiver

The Si4707 IC is the industry's first weather band (WB) radio receiver to include a specific area message encoding (SAME) processor. Leveraging Silicon Labs' proven and patented Si4700/01 FM tuner's digital low intermediate frequency (low-IF) receiver architecture, the Si4707 delivers superior RF performance combined with sophisticated digital processing to yield best-in-class audio quality and SAME data sensitivity. 

The Si4707 weather band receiver provides the space savings and low-power consumption necessary for portable devices while delivering the high performance and design simplicity desired for all weather alert radios. 

Offering unmatched integration and PCB space savings, the Si4707 requires only one external component and less than 15 mm² of board area.  Available in a tiny 3 mm x 3 mm QFN package, it eliminates the need for a front-end tuner IC, external ADC, DSP, RAM, and numerous discrete components found in traditional SAME weather band radios. 

The high integration and complete system production test simplifies design in, increases system quality, and improves manufacturability.



  • Weather band support (162.4–162.55 MHz)
  • SAME processor
  • 1050 Hz alert tone detection
  • Frequency synthesizer with integrated VCO
  • WB digital tuning
  • Programmable reference clock
  • 2.7 to 5.5 V supply voltage

Si4707 Product Matrix

Part Number Data Sheet Description Tuning Method Display Method Mono/Stereo RDS FM AM SW LW WB TX EN55020
Weather Band Receiver Digital Digital Stereo Yes No No No No Yes No No
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