GS1671 datasheet(124/130 Pages) SEMTECH

Part #	GS1671

Description	HD/SD SDI Receiver, with Integrated Adaptive Cable Equalizer complete with SMPTE Audio and Video Processing

PDF	130 Pages

Scroll/Zoom	100%

Manufacturer	SEMTECH [Semtech Corporation]

Direct Link	http://www.semtech.com

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124 / 130 page

GS1671 HD/SD SDI Integrated Receiver

Data Sheet

53737 - 2

September 2012

124 of 130

5. Application Reference Design

5.1 High Gain Adaptive Cable Equalizers

The GS1671 has an integrated adaptive cable equalizer. In order to extend the cable

length that an equalizer will remain operational at, it is necessary for the equalizer to

have high gain.

A video cable equalizer must provide wide band gain over a range of frequencies in

order to accommodate the range of data rates and signal patterns that are present in a

SMPTE compliant serial video stream.

Small levels of signal or noise present at the input pins of the GS1671 may cause chatter

at the output. In order to prevent this from happening, particular attention must be paid

to board layout.

5.2 PCB Layout

Special attention must be paid to component layout when designing Serial Digital

Interfaces for HDTV. An FR-4 dielectric can be used, however, controlled impedance

transmission lines are required for PCB traces longer than approximately 1cm. Note the

following PCB artwork features used to optimize performance:

• The PCB ground plane is removed under the GS1671 input components to minimize

parasitic capacitance.

• High speed traces are curved to minimize impedance changes.

GS1671 Datasheet(PDF) 124 Page - Semtech Corporation