J.83 Annex B cable modulator - RF output with AD9789 DAC
     
       
         
  Full J.83 Annex B cable modulator - RF output with AD9789 DAC  
         
  The J.83B cable modulator modules an MPEG-TS DVB-SPI input into a QAM-16/256 output in base band with AD9789 RF DAC.  
         
Description

The MVD Cable modulator J83B core is a drop-in module that includes the following functions:
  • Input data framer from DVB-SPI source (MPEG-TS flow)
  • J83B modulator
    • Energy dispersal,
    • Reed Solomon encoder
    • Interleaver
    • QAM symbol mapper
  • Output for complex DAC (2 x 8 bits)
   Features
  • ITU-T J.83 Annex B compliant baseband transmitter for Cable Modem Termination Systems (CMTS)
  • Drop-in module for Virtex-5™, Virtex-4™ and Spartan™-3/E/A FPGAs
  • Single clock (up to 140 MHz+ for Spartan-3™, 180 MHz+ for Virtex-4™ and Virtex-5™)
  • Robust SPI input (discarding of incorrect input packets)
  • PCR re-stamping
  • Supports 5.056941 & 5.360537 symbol rates
  • Programmable 64 and 256 QAM Symbol Mapping
  • All interleaver modes supported thanks to external Synchronous SRAM
  • Reduced interleaver modes can be implemented as internal memory
  • Base band output for complex DAC (2 x 8 bits)
  • Single channel - support for multi channel
  • Full synthetizable RTL VHDL design (not delivered) for easy customization
  • Design delivered as Netlist
  • MER > 43dB
Applications

May be used in applications related to cable transmission, typically at the cable head end.

Companion cores:

    
Documentation
Product brief        
Data sheet        
Application note "From MPEG-TS to RF"
           
Contact
Sales: info_cores@mvd-fpga.com
Technique: support_cores@mvd-fpga.com