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


The Si47911/12 integrates global radio receiver with audio processing. The analog AM/FM receiver 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.

The Si47911/12 is the most integrated monolithic IC in the industry with the smallest external bill of materials. Si47911/12 based systems can scale from low-cost single tuner AM/FM radio to the highest performance systems with multiple tuners and multiple antennas, enabling radio suppliers to reuse R&D across multiple product lines, all with a common software API. The Si47911/12 meets rigorous automotive quality standards.

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 which can be configured for specific car models, as well as development tools which 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
  • AM/FM:
    • Comprehensive AM/FM signal processing firmware
    • Integrated active AM/FM buffers for background/data tuners
    • Analog FM phase diversity with two, three or four tuners
    • Fully integrated AGC for AM and FM inputs
  • HD Radio:
    • Digital I/Q interface to HD Radio Processor
    • HD Radio MRC with two, three or four tuners
    • AM/FM HD Radio IBOC blend
    • Fast FM HD Radio band scan
  • AEQ-Q100 qualified
    • DAB/DAB+/DMB (Si47912 only):
    • Digital I/Q interface to DAB/DAB+/DMB processor
    • DAB/DAB+/DMB MRC with two, three or four tuners
    • 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
  • Audio:
    • 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
  • 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

Si4791x Product Matrix

Part Number Data Sheet Description Audio FM AM SW LW WB RDS HD Radio DAB/DAB+ FM Diversity Audio System
FM/AM/RDS/HD Radio receiver, audio system, automotive qualified AEC-Q100 Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes
FM/AM/RDS/HD/DAB radio receiver, audio system, automotive qualified AEC-Q100 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
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