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CXD1958Q - MMDS TCM/QAM Demodulator + FEC + ADC

Description

The CXD1958Q is an integrated TCM/QAM demodulator for MMDS systems using the DAVIC MMDS standard.

Features

  • DAVIC MMDS V1.1 and V1.3 compliant.
  • Supports 16, 64 and 256QAM.
  • Supports 16, 64 and 256 TCM.
  • Internal 8-bit ADC.
  • Interface for 10-bit external ADC.
  • 36.125MHz nominal IF input.
  • Symbol rate range 5.
  • 5.304Mbaud in 6MHz channels.
  • Integrated matched filtering with 0.15 roll-off factor.
  • ±400KHz internal carrier offset compensation with negligible losses @ 5Mbaud 6MHz channel.
  • Symbol timing loop designed.

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CXD1958Q MMDS TCM/QAM Demodulator + FEC + ADC Description The CXD1958Q is an integrated TCM/QAM demodulator for MMDS systems using the DAVIC MMDS standard. This highly integrated device incorporates an internal 8-bit ADC, image rejection and root-raised cosine filters, all-digital symbol timing recovery PLL, adaptive decision feedback equalizer (DFE) with 10 feedforward and 30 feedback taps, 4-D TCM decoder, and DAVIC/DVB compliant forward error correction comprising (204,188) Reed Solomon decoder, a programmable de-interleaver with I = 12 and I = 204, and a de-randomiser. All internal clocks are generated from a single external 30MHz reference crystal.
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