DOCSIS® 3.1 and Video Cable Head-end Transmitter

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The BCM3047 is a single port downstream modulator chip with support for 160 QAM narrowcast channels with additional support for six OFDM 192 MHz channels. The BCM3047 also has an integrated 6.4 GHz DAC for direct digital synthesis up to 1.2 GHz. The BCM3047 is CCAP-compliant and supports DOCSIS® 1.0/1.1/2.0/3.0/3.1 specifications and SCTE/ITU-B standards. Each of the QAM downstream modulators supports programmable modulation formats up to 1024 QAM (per the C-DOCSIS standard).


  • Support for one RF interface
  • Support 160 narrowcast QAM channels in Annex A, B and C modes
  • Supports six OFDM channels at 24 MHz minimum and 192 MHz maximum channel width
  • SCTE 55-1 and SCTE 55-2 OOB modulators
  • Flexible broadcast and narrowcast assignment per RF interface
  • Complete flexibility in QAM channel frequency placement
  • Integrated 6.4 GHz DAC with integrated PLL
  • MPT, PSP, DEPI, DS_PHY_MSA, ext Mode for remote PHY
  • DS_PHY_MSA timestamp interface
  • Up to two 10GKR interfaces for data plane traffic
  • Two 10GKR interfaces available for board daisy chain configuration carrying data broadcast and in-band
  • On-chip interleaver memory
  • In band GMAC based register provisioning
  • Support for industrial temperature range for remote PHY applications
  • Support for DEPI as defined by CableLabs

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