GS1661 datasheet(78/84 Pages) SEMTECH

Part #	GS1661

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

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Manufacturer	SEMTECH [Semtech Corporation]

Direct Link	http://www.semtech.com

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78 / 84 page

GS1661 HD/SD SDI Receiver

Data Sheet

53751 - 3

September 2012

78 of 84

5. Application Reference Design

5.1 High Gain Adaptive Cable Equalizers

The GS1661 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 GS1661 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 GS1661 input components to minimize

parasitic capacitance.

• High-speed traces are curved to minimize impedance changes.

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