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ESD protection on LMH0002 output line

shizunori
Prodigy 250 points
Other Parts Discussed in Thread: LMH0002

Hi,

If we want to protect ESD on LMH0002 output line, does TI recommend using discrete parts on tis line or not?

Please advise me about this issue and introduce some application note.

Regards

Kaz

  • 0
    TI__Expert 4400 points

    I apologize for the delayed response to your question.

    The LMH0002 cable driver offers good ESD protection (5 kV HBM).  For optimal cable driver performance, we advise against using discrete ESD protection on the cable driver output line because these components can introduce parasitic capacitance and slow down the LMH0002 output edges.  Depending on your application, you may have margin for this, and if you carefully choose these components and are careful with your layout, it can be done successfully.

    If you choose to add these discrete components to the LMH0002 output, it is best to choose components with low capacitance and small body size.  Small component size is important in order to maintain the impedance control on the output, because large component pads will have a negative effect on this impedance and the output return loss.

    The following application note shows a good example layout for an SDI cable driver and explains the importance of impedance control on the output trace:

    SNLA118C Board Layout Challenges in SDI