National Semiconductor LMH0034 SMPTE 292M 259M Adaptive Cable Equalizer
Summary
The LMH0034 is a specialized equalizer IC designed for professional broadcast applications. This manual details its capabilities in equalizing high-speed serial data signals while maintaining integrity over dispersive cables. It supports industry standards including SMPTE 292M, 344M, and 259M, providing equalization robustly from 143 Mbps up to 1.485 Gbps. Key features include extensive cable length compensation (up to 350m), DC restoration for perfect signal recovery, and versatile single/differential I/O options, making it essential for critical data transmission paths in broadcast infrastructure.
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PRELIMINARY
LM TE 292M /259M daptive able qualizer
January
LMH0034 SMPTE 292M 259M Adaptive Cable Equalizer General Description Features
The LMH0034 SMPTE 292M 259M adaptive cable equal- SMPTE 292M, SMPTE 344M and SMPTE 259M izer is monolithic integrated circuit for equalizing data compliant transmitted over cable (or any media with similar dispersive Supports DVB-ASI at Mbps
loss characteristics). The equalizer operates over wide High data rates: Mbps to 1.485 Gbps range of data rates from Mbps to 1.485 Gbps and
Equalizes up to meters of Belden 1694A at 1.485
supports SMPTE 292M, SMPTE 344M and SMPTE 259M.
Gbps or up to meters of Belden 1694A at Mbps
The LMH0034 implements DC restoration to correctly handle Manual bypass, cable length indicator, and output mute pathological data conditions. DC restoration can be by- with programmable threshold passed for low data rate applications. The equalizer is flex-
Single-ended or differential input
ible in allowing either single-ended or differential input drive.
50Ω differential outputs
Additional features include combined carrier detect and
Single 3.3V supply operation
output mute pin which mutes the output when no signal is
208m W typical power consumption with 3.3V supply
present. programmable mute reference is used to mute the
Replaces the GS1524 and GS1524A
output at selectable level of signal degradation. cable length indicator is provided to determine the amount of cable
Applications
being equalized.
SMPTE 292M, SMPTE 344M, and SMPTE 259M serial digital interfaces Serial digital data equalization and reception Data recovery equalization
Typical Application
National Semiconductor Corporation DS201734 www.national.com
Page Summary Contents For National Semiconductor LMH0034 SMPTE 292M 259M Adaptive Cable Equalizer
Manual Details
| Brand | National |
|---|---|
| Pages | 7 |
| File Size | 502.39 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
What is the operating voltage for the LMH0034 equalizer?
It can operate on a single 3.3V supply, with an acceptable range of −0.5V to 3.6V.
Which SMPTE standards does the LMH0034 support?
It supports SMPTE 292M, SMPTE 344M, and SMPTE 259M serial digital interfaces.
How far can this equalizer run at different data rates?
At 1.485 Gbps, it supports equalization up to 140 meters of Belden 1694A; at 270 Mbps, it supports up to 350 meters.
What features help maintain signal quality or indicate cable length?
It includes DC restoration, a cable length indicator, and an output mute pin for pathological data conditions.