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Original question:

SN65DP141: IF SN65DP141 can support DP1.4?

SN65DP141: Common mode input noise rejection

Jeff Xie
Intellectual 1780 points
Part Number: SN65DP141

Hi team,

In old project customer met input common mode issue. The noise frequency range is less than 10MHz and LVDS frequency range is several hundred MHz to 5GHz, is there any way to reject the common noise? 

For current circuit, the capactior is used to isolated input common voltage and input common voltage is biased by internal circuit. Is there other way to improve the common noise rejection? Thanks.

  • 0
    TI__Guru**** 176811 points

    Hi,

    What is causing the input common mode noise?

    Most common solution is the common mode choke. You can take a look at the Murata website for common mode chock for the DisplayPort design: https://www.murata.com/en-us/products/emc/emifil/selectionguide/feature/spec-disp.

    The monolithic EMI filters is an alternative solution to the common mode choke.

    Improvement in the differential trace routing can also help with the common mode noise. The intra-pair skew should be minimized as much as possible so the differential signal is routed in equal length. The differential signal should also be routed tightly to reject any possible noise coupling from the adjacent plane.

    Thanks

    David