Mitsubishi chip will lower the price of settops and cable modems.......
Mitsubishi Announces Sample Availability of QAM Channel Decoder for
Cable Modem, Digital CATV Set-top Box and MMDS System
Applications
SUNNYVALE, Calif.--(BUSINESS WIRE)--May 13, 1998--
MCNS-compliant channel decoder integrates QAM demodulator,
forward error correction decoder and A-D converter functions
on a single chip
The Electronic Device Group of Mitsubishi Electronics America Inc. today announced sample availability of the M65690FP
QAM Channel Decoder chip, which complies with the Multimedia Cable Network System (MCNS) standard and reduces
the overall system development costs of cable modem, digital CATV set-top box and multichannel multipoint distribution
system (MMDS) applications.
The high-performance features of the M65690FP chip's carrier-recovery loop and equalizer reduces tuner performance
requirements, allowing designers to use a more cost-effective tuner for the system's front end. The M65690FP reduces
back-end system development costs by integrating quadrature amplitude modulation (QAM) demodulator, forward error
correction (FEC) decoder, 10-bit A-D converter and voltage-controlled crystal oscillator (VCXO) functions into a single
chip. The reduced system chip count simplifies design and conserves printed circuit board space. The M65690FP has a
typical power consumption of 900 mW at 22 MHz.
The M65690FP conforms to the MCNS specification by using a 64-QAM and 256-QAM modulation scheme and a
concatenated FEC scheme consisting of Reed-Solomon and Trellis decoders, a deinterleaver that supports fixed and variable
interleaving, a derandomizer and MPEG-2 framing. The decoder's I2C(TM) bus control allows designers to monitor bit error
counts, symbol constellation, acquisition time and internal signals of the device.
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