Si4791x High-Performance Automotive AM/FM Radio Receiver and HD Radio™/DAB/DAB+/DMB/DRM Tuner with Audio System


The high performance Silicon Labs Si47911/12 is the most integrated monolithic IC in the industry with the smallest external bill of materials. The analog AM/FM receiver integrates global receiver with audio processing and sets a new standard for automotive broadcast reception. The integrated audio processing sub-system provides a complete solution to synchronize, process, aggregate, and distribute digital and analog audio signals in the head-unit. 

Using a common software API, designers can reuse their R&D across multiple product lines. The Si47911/12 meets rigorous automotive quality standards and can scale from low cost single tuner AM/FM radios to high performance systems with multiple tuners and multiple antennas. 

The Si47911/12 has a set of audio software products and tools available for license, which provide a complete solution for audio post-processing in the radio. The audio offering includes a fixed set of audio post-processing functions available for configuration to specific car models. The development tools enable users to port their audio algorithms and design a custom audio processing flow on the Si47911/12 audio system.



  • Worldwide FM band support (64–108 MHz)
  • Worldwide AM band support (520–1710 kHz)
  • LW band support (144–288 kHz)
  • SW band support (2.3–30 MHz)
  • DAB/DAB+/DMB support (170–240 MHz, 1452–1492 MHz) (Si47912 only)
  • NOAA Weather Band support
  • On-chip soft-decision RDS/RDBS demodulator/decoder
  • Frequency synthesizer with fully integrated PLL-VCO
  • Integrated clock oscillator
  • 1.8 V or 3.3 V digital IO power supplies
  • 3.3 V analog power supply and 1.8 V digital power supply
  • QFN 84-pin, 12x12x0.85 mm
  • Pb-free/RoHS compliant
  • AEC-Q100 qualified (A-grade parts)


  • Comprehensive AM/FM signal processing firmware
  • Integrated active AM/FM buffers for background/data tuners
  • Fully integrated AGC for AM and FM inputs


  • Tensilica HiFi EP audio DSP with 288 kB for program and data memory
  • Seven analog audio inputs
  • Six analog audio outputs
  • Seven digital audio ports (I2S) with TDM support
  • Up to 24 synchronous or asynchronous sample rate converters

HD Radio:

  • Digital I/Q interface to HD Radio Processor
  • Fast FM HD Radio band scan

DAB/DAB+/DMB (Si47912 only):

  • Digital I/Q interface to DAB/DAB+/DMB processor
  • Integrated active Band III/L-band buffers for background/data tuners
  • Fast DAB/DAB+/DMB band scan
  • Fully integrated AGC for Band III and L-Band inputs

Si4791x Product Matrix

Part Number FM AM SW LW WB RDS DRM30/DRM+ HD Radio DAB/DAB+ Audio System
Yes Yes Yes Yes Yes Yes No Yes No Yes
Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
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