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LMH1219: LMH1219 signal measure

shfy lz
Prodigy 50 points
Part Number: LMH1219

I don't know why  series  4.7uF capacitor  connected to the 12G-SDI high-speed differential signal. How to measure the signal quality of this chip。Thanks a lot！

  • 0
    TI__Guru* 93670 points
    Greetings,
    4.7uF Capacitors are needed to isolate common mode voltage. If we don't use these capacitors these would affect signal quality. To measure signal quality, please refer to LMH1219 programming guide. In this document you can see reference to two parameters: HEO(Horizontal Eye Opening) and VEO(Vertical Eye Opening). These two parameters indicate incoming signal quality.
    Regards,,nasser