CLC034

SMPTE 292M / 259M Adaptive Cable Equalizer

General Description

The CLC034 SMPTE 292M / 259M adaptive cable equalizer

is a monolithic integrated circuit for equalizing data transmit-

ted over cable (or any media with similar dispersive loss

characteristics). The equalizer operates over a wide range of

data rates from 143 Mbps to 1.485 Gbps and supports

SMPTE 292M, SMPTE 344M and SMPTE 259M.

The CLC034 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 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.

Features

n

SMPTE 292M, SMPTE 344M and SMPTE 259M

compliant

n

Supports DVB-ASI at 270Mbps

n

High data rates: 143 Mbps to 1.485 Gbps

n

Equalizes up to 140 meters of Belden 1694A at 1.485

Gbps or up to 350 meters of Belden 1694A at 270 Mbps

n

Manual bypass, cable length indicator, and output mute

with a programmable threshold

n

Single-ended or differential input

n

50

Ω differential outputs

n

Single 3.3V supply operation

n

Replaces the GS1524

Applications

n

SMPTE 292M, SMPTE 344M, and SMPTE 259M serial

digital interfaces

Typical Application

20085901

PRELIMINARY

February 2005

© 2005 National Semiconductor Corporation

DS200859

www.national.com