Si4797x Automotive Dual Receivers with Audio DSP Subsystem


High-performance Automotive Dual AM/FM Radio Receiver and HD-Radio™/DAB/DAB+/DMB/DRM Tuner with Audio System, automotive qualified AEC-Q100.



  • Dual 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)
  • Dual DAB/DAB+/DMB support (170–240 MHz) (Si47972 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 88-pin, 12x12x0.85 mm
  • Pb-free/RoHS compliant
  • AEQ-Q100 qualified


  • 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

DAB/DAB+/DMB (Si47972 only)

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

HD Radio

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


  • Tensilica HiFi EP audio DSP with 512 kB for program and data memory
  • Six analog audio inputs
  • Six analog audio outputs
  • Seven digital audio ports (I2S) with TDM support
  • Up to 24 synchronous or asynchronous sample rate converters

Si4797x Product Matrix

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