Si4708/09 Tiny FM Radio Receiver ICs​

​As the world's smallest FM receiver solution, the Si4708/09 FM radio receiver ICs extend Silicon Labs' Si4700 FM tuner family and further increases the ease and attractiveness of adding FM radio reception to mobile devices.
​Requiring only 6.25 mm² of board space, the Si4708/09 ICs are the world's smallest FM receivers offering a minimum component count, flexible and proven programmability and superior, proven performance. The Si4708/09 leverage Silicon Labs' highly successful and patented Si4700/01/02/03 FM tuner and are software-compatible to existing Si4700/01/02/03 FM tuner designs. The Si4708/09 ICs benefit from proven digital integration and 100% CMOS process technology, resulting in a completely integrated solution. The Si4708/09 ICs' highly flexible functionality caters to the subjective nature of audio preferences and variable FM broadcast environments worldwide.


  • Worldwide FM band support (76–108 MHz)
  • Automatic frequency control (AFC)
  • Automatic gain control (AGC)
  • Excellent overload immunity
  • Signal strength measurement
  • Digital low-IF receiver



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Data Sheet (1)

Data Short (1)

Broadcast FM Radio Tuner for Portable Applications
402081015 kB

User Guides (1)

Si47xx-EVB User Guide
0.83/14/20149789 kB

Application Notes (8)

White Papers (3)

PCN (5)

Development Kits

Design Tools

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Software (3)

0.31/24/200968 kB
0.17/11/200833 kB
Release Notes for the Precision Clock (DSPLLsim) EVB Software
7/23/20149 kB
Product Matrix
Part NumberDescriptionTuning MethodDisplay MethodMono/StereoRDSFMAMSWLWWBTXEN55020Datasheet
Si4708FM Receiver - ultra small packageDigitalDigitalStereoNoYesNoNoNoNoNoNo
Si4709FM Receiver w RDS - ultra small packageDigitalDigitalStereoYesYesNoNoNoNoNoNo


    • Digital Low-IF Receiver
    • Integrated LDO regulator allows direct connection to battery.
    ​​​The Si4709 incorporates a digital processor for the European Radio Data System (RDS) and the US Radio Broadcast Data System (RBDS) including all required symbol decoding, block synchronization, error detection and error correction functions. RDS enables data such as station identification and song name to be displayed to the user. The Si4709 offers both a detailed RDS view and a standard view, allowing adopters to selectively choose granularity of RDS status, data, and block errors. Si4709 software is backwards compatible to the proven Si4701/03, adopted by leading cell-phone, PND and MP3 manufacturers world-wide.
    ​​​he Si4708/09 devices' high level of integration and complete FM system increase quality to manufacturers, improve device yields and simplify device manufacturing and final testing.


    Product Matrix





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