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TFP401 routing issue

mskk12
Prodigy 150 points
Other Parts Discussed in Thread: TFP401, TFP410

Sir, we are using the TFP401 to convert the RGB to HDMI signal, the TFP401 guideline says the HDMI traces had better less than two inches long. May I know why got such a requirement? since HDMI signal is just for long distance transmitting and the HDMI cable can be easily several meters long. Thanks for your help. 

  • 0
    TI__Guru* 76130 points

    Hello,

    The PCB trace will add loss per inch to a high speed signal, the longer the PCB trace the bigger the loss so the external cable.

    The PCB trace length is not exactly equivalent to an external cable length. 

    I suppose you meant to say TFP410 (and not TFP401). 

    Regards.

  • 0 in reply to Elias Villegas M.
    Prodigy 150 points

    Yes, it is TFP410, sorry for the mistake. So the loss is the main reason for shorter pcb trace?  

    if we got an equalizer in the receiver end, can the trace be longer?

    For another issue, is the HDMI signal frequency fixed or not fixed? if our pixel resolution and refresh rate

    is much lower, e.g., 640x480, 60Hz, will the HDMI frequency much lower and not so sensitive to trace

    length? Thanks. 

  • 0 in reply to mskk12
    TI__Guru* 76130 points

    Correct,

    There are re-drivers that allow for longer traces.

    The pixel frequency is not fixed, lower resolution and frame rate will require lower pixel frequency.

    Regards.