​Si4707 Weather Band Radio Receiver ICs

The Si4707 IC is the industry's first weather band (WB) radio receiver to include a specific area message encoding (SAME) processor. 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 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.
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 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



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Data Sheet (1)

Si4707-B20 Weather Band and SAME Data Receiver
0.87/18/2012390 kB

Data Short (1)

Si4707 Data Short
0402081014 kB

User Guides (1)

Si47xx-EVB User Guide
0.83/14/20149789 kB

Application Notes (7)

White Papers (1)

FM Tutorial
0926089/26/2008396 kB

PCN (4)

Design Tools

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Software (1)

0.31/24/200968 kB
Product Matrix
Part NumberDescriptionTuning MethodDisplay MethodMono/StereoRDSFMAMSWLWWBTXEN55020Datasheet
Si4707Weather Band Receiver with SAME DecoderDigitalDigitalStereoYesNoNoNoNoYesNoNo
    The Si4707 is a feature-rich solution including 1050 Hz tone detection, automatic frequency control, dynamic channel bandwidth filters, and digital tuning. In addition, the Si4707 provides a programmable reference clock and supports an I2C compatible 2-wire control interface, SPI and a Si4700/01 backwards compatible 3-wire control interface.
    The Si4707 incorporates a digital processor to provide SAME data, advance error correction and SAME data quality metrics. Using this feature, the Si4707 enables broadcast alert data such as severe thunderstorm warning or flash flood watch to be displayed to the user.


    Product Matrix





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