LMH0034
SMPTE 292M / 259M Adaptive Cable Equalizer
General Description
Features
The LMH0034 SMPTE 292M / 259M adaptive cable equalizer
is a monolithic integrated circuit for equalizing data transmitted over cable (or any media with similar dispersive loss
characteristics). The equalizer operates over a wide range of
data rates from 125 Mbps to 1.485 Gbps and supports
SMPTE 292M, SMPTE 344M and SMPTE 259M.
The LMH0034 implements DC restoration to correctly handle
pathological data conditions. DC restoration can be bypassed
for low data rate applications. The equalizer is flexible in allowing either single-ended or differential input drive.
Additional features include a combined carrier detect and output mute pin which mutes the output when no signal is
present. A programmable mute reference is used to mute the
output at a selectable level of signal degradation. A cable
length indicator is provided to determine the amount of cable
being equalized.
■ SMPTE 292M, SMPTE 344M and SMPTE 259M
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compliant
Supports DVB-ASI at 270 Mbps
Data rates: 125 Mbps to 1.485 Gbps
Equalizes up to 200 meters of Belden 1694A at 1.485
Gbps or up to 400 meters of Belden 1694A at 270 Mbps
Manual bypass, cable length indicator, and output mute
with a programmable threshold
Single-ended or differential input
50Ω differential outputs
Single 3.3V supply operation
208 mW typical power consumption with 3.3V supply
Replaces the GS1524 and GS1524A
Applications
■ SMPTE 292M, SMPTE 344M, and SMPTE 259M serial
digital interfaces
■ Serial digital data equalization and reception
■ Data recovery equalization
Typical Application
20173401
© 2011 National Semiconductor Corporation
201734
www.national.com
LMH0034 SMPTE 292M / 259M Adaptive Cable Equalizer
May 16, 2011
