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DVB-C modulator / J83 modulator

Product code: CMS0021

The CMS0021 single-channel DVB-C modulator / J83 modulator is fully compliant with the European, US and Japanese downlink cable standards DVB-C EN 300 429 and ITU J83 Annexes A/B/C (including DOCSIS 1.1/2.0). The core provides all the necessary functions between transport stream input and a modulated QAM output.
J.83B designs can operate either from internal memory (short interleaving modes) or from shared external memory (long interleaving modes) by means of a versatile access controller.
Typical applications of the CMS0021 include head-end video and broadband data transmissions systems (CMTS), cable modem test equipment and point-to-point (PTP) or point-to-multipoint microwave radio links.
A range of synthesis options allows the core to be tailored for any particular application.


DVB-C modulator / J83 modulator DVB-C Standard

Block diagram

DVB-C modulator / J83 modulator block diagram (click to enlarge)
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Safari Plug-in

DVB-C modulator / J83 modulator safari plug-in (click to enlarge)
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Standards compliance

  • DVB-C EN 300 429
  • ITU J83 Annexes A/B/C
  • DOCSIS 1.1/2.0


  • Modulation accuracy > 45dB (MER).
  • Variable symbol rate interpolation.
  • Software selectable channel filter.
  • On-chip or off-chip interleaver memory.
  • Single or multiple standards per core.
  • Multiple cores provide > 1 channel.
  • Optional internal IF conversion.
  • Optional noise source.
  • External AD9857/AD9957 DDS interface.
  • Automatic AD9857/AD9957 programming.
  • External AD9789 interface.


  • Head-end digital video and broadband data (CMTS) transmission systems.
  • Next generation, bandwidth-on-demand CMTS systems employing channel- bonding.


Plug-ins / Extensions