1 of 16

GS2974A HD-LINX™ III Adaptive Cable Equalizer

www.gennum.com

Data Sheet

42216 - 3

January 2009

GS2974A HD-LINX™ III Adaptive Cable Equalizer

Features

• SMPTE 424M, SMPTE 292M and SMPTE 259M

compliant

•Automatic cable equalization

• 0.3UI Maximum Output Jitter at 2.97Gb/s

• Multi-standard operation from 143Mb/s to 2.97Gb/s

• Supports DVB-ASI at 270Mb/s

• Small footprint (4mm x 4mm)

• Pb-free and RoHS compliant

• Manual bypass (useful for low data rates with slow

rise/fall times)

• Performance optimized for 1.485Gb/s and 2.97Gb/s

• Typical equalized length of Belden 1694A cable: 120m

at 2.97Gb/s, 200m at 1.485Gb/s, and 350m at 270Mb/s

•50Ω differential output (internal 50Ω pull-ups)

• Programmable mute based on max cable length adjust

• Single 3.3V power supply operation

• Operating temperature range: 0°C to +70°C

Applications

• SMPTE 424M, SMPTE 292M and SMPTE 259M Coaxial

Cable Serial Digital Interfaces.

Description

The GS2974A is a high-speed BiCMOS integrated circuit

designed to equalize and restore signals received over 75Ω

co-axial cable.

The GS2974A is designed to support SMPTE 424M, SMPTE

292M and SMPTE 259M, and is optimized for performance

at 1.485Gb/s and 2.97Gb/s.

The GS2974A features DC restoration to compensate for

the DC content of SMPTE pathological test patterns.

A voltage programmable mute threshold (MCLADJ),

applicable for SD mode (refer to Section 4.3), is included to

allow muting of the GS2974A output when an approximate

selected cable length is reached for SMPTE 259M signals.

This feature allows the GS2974A to distinguish between

low amplitude SD-SDI signals and noise at the input of the

device. The serial digital outputs of the GS2974A may be

forced to a mute state by applying a voltage to the MUTE

pin.

Power consumption is typically 215mW using a 3.3V

power supply. The GS2974A is lead-free, and the

encapsulation compound does not contain halogenated

flame retardant.

This component and all homogeneous subcomponents are

RoHS compliant.

GS2974A Functional Block Diagram

CABLE LENGTH ADJUSTOR

CARRIER

DETECT MUTE

EQUALIZER

DC RESTORE

OUTPUT

AGC

CD

MUTE

SDO

BYPASS

SDO

SDI

SDI

MCLADJ