​Si4707 Weather Band Radio Receiver ICs

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Si4707 Block Diagram

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.


Features

  • 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
 

Applications

  • Emergency radios
  • Table and portable radios
  • Stereos
  • Mini/micro systems
  • Portable media players
  • Boom boxes
  • Cellular handsets
  • Modules
  • Clock radios
  • Mini HiFi
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Documentation    Expand All   Collapse All

 
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Data Sheet (1)

Document NameDescriptionVersionLast Updated
Si4707_B20.pdf
Si4707-B20 Data Sheet0.812/11/2008

Data Short (1)

Document NameDescriptionVersionLast Updated
Si4707_short.pdf
Si4707 Data Short040208

User Guides (1)

Document NameDescriptionVersionLast Updated
Si47xxEVB.pdf
Si47xx-EVB User Guide0.75/24/2011

Application Notes (7)

Document NameDescriptionVersionLast Updated
AN230.pdf
AN230: Si4700/01/02/03 Programmer's Guide0.84/24/2009
AN235.pdf
AN235: Si4700/01/02/03 Evaluation Board Quick Start Guide0.66/10/2008
AN332.pdf
AN332: Si47xx Programming Guide0.812/1/2011
AN346_Chinese.pdf
AN346: Si47xx Evaluation Board Quick Start Guide (Chinese)0.1 (Chines4)
AN346.pdf
AN346: Si47xx Evaluation Board Quick-Start Guide0.1
AN383.pdf
AN383: Si47xx Antenna, Schematic, Layout and Design Guidelines0.612/3/2011
AN388.pdf
AN388: Si470/1x/2x/3x/4x Evaluation Board Test Procedure0.2

White Papers (1)

Document NameDescriptionVersionLast Updated
FMTutorial.pdf
FM Tutorial0926089/26/2008

PCN (2)

Document NameDescriptionVersionLast Updated
1110251 Si47xx-B20 B30 B31 C40 D50 D60 3x3mm QFN Change to Copper Wire in ASEKR std.pdf
1110251 Si47xx-B20 B30 B31 C40 D50 D60 3x3mm QFN Change to Copper Wire in ASEKR std
1104011-Cancelled-ASEKR Die Bond Adhesive – Japan Earthquake and Tsunami Disaster Recovery.pdf
Cancelled-ASEKR Die Bond Adhesive – Japan Earthquake and Tsunami Disaster Recovery
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Design Tools    Expand All   Collapse All

 
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Software (1)

Document NameDescriptionVersionUpdated
AN332_Si47xxExampleCode.zip
AN332SW0.31/24/2009
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Product Matrix


Part Number Available DocumentsDescriptionDig I/ORDS Support
Si4707Data Sheet
Data Sheet
Dedicated weather band radio receiver with SAME decoderNoYes
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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.

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