LMH0024

3.3V SMPTE 259M / 344M Adaptive Cable Equalizer

General Description

The LMH0024 SMPTE 259M / 344M adaptive cable equal-

izer 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 143 Mbps to 540 Mbps and sup-

ports SMPTE 259M and SMPTE 344M.

The LMH0024 implements DC restoration to correctly handle

pathological data conditions. DC restoration can be by-

passed for low data rate applications. The equalizer is flex-

ible in allowing either single-ended or differential input drive.

Additional features include a mute pin which can be used to

manually mute the output and a cable length indicator which

determines the amount of cable being equalized.

Features

n

SMPTE 259M and SMPTE 344M compliant

n

Supports DVB-ASI at 270 Mbps

n

Data rates: 143 Mbps to 540 Mbps

n

Equalizes up to 350 meters of Belden 1694A at 270

Mbps

n

Manual bypass, cable length indicator, and output mute

n

Single-ended or differential input

n

50

Ω differential outputs

n

Single 3.3V supply operation

n

Industrial temperature range: −40˚C to +85˚C

n

198mW typical power consumption with 3.3V supply

n

Footprint compatible with the LMH0034 and the GS9064

Applications

n

SMPTE 259M and SMPTE 344M serial digital interfaces

n

Serial digital data equalization and reception

n

Data recovery equalization

Typical Application

20172501

PRELIMINARY

February 2006

© 2006 National Semiconductor Corporation

DS201725

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