Si4704/05 FM Radio Receivers

The Si4704/05 enhanced FM receiver family is the most advanced portable solution available today offering digital audio out, worldwide FM band support, and highly flexible and proven FM functionality in a simple API. 

The Silicon Labs Si4705 IC offers digital audio out for FM recording. The content can also be tagged with RDS information, allowing song name and artist labels to be displayed similar to MP3 meta data. Using the digital audio out, the Si4705 can also reduce total system power consumption by avoiding unnecessary ADC/DAC conversions between the FM receiver and the host processor.



  • Worldwide FM band support (64~108 MHz)
  • Supports integrated antenna
  • Seek tuning
  • Automatic frequency control (AFC)
  • Automatic gain control (AGC)
  • Adjustable seek parameters
  • Adjustable mono/stereo blend

Getting Started with Si4704/05 FM Radio Receivers

Si4704/05 Evaluation Kits

The easiest way to begin development with the Si4702/03 family is with the Si4704/05 Evaluation Kits.

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Si4704/05 Product Matrix

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