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GS3440 Datasheet(PDF) 17 Page - Semtech Corporation

Part # GS3440
Description  Extended Reach 3G/HD/SD Adaptive Cable Equalizer
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

GS3440 Datasheet(HTML) 17 Page - Semtech Corporation

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GS3440 Adaptive Cable Equalizer
Final Data Sheet
Rev. 2
December 2012
17 of 23
Proprietary and Confidential
5. Application Information
5.1 High-Gain Adaptive Cable Equalizers
The GS3440 is a multi-rate adaptive cable equalizer. In order to continue to extend the
cable length that the device can support, it is necessary to have high-gain in the
equalizer.
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 equalizer 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:
• PCB trace width for 3Gb/s rate signals is closely matched to SMT component width
to minimize reflections due to change in trace impedance.
• High-speed traces are curved to minimize impedance changes.
• Cutouts in the inner layers should be used under the GS3440 input and output
components to minimize parasitic capacitance. For more detail on this and other
layout recommendations, please refer to A Guide For Designing With Gennum’s
3G-SDI Equalizers.


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