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LMH6586: Move video to 0v

Part Number: LMH6586

Hi Team,

I am using LMH6586 for my analog video switching, where I have 3 different switches for R, Gs and B. G is having embedded sync, whereas R and B don't have.

I want all (R, G and B) black level to be at 300mv, R and B switch VREF_Clamp pin is set-to 300mv and it's working fine, whereas for G when and trying to put VREF_Clamp to 0v am seeing some loss at the sync. In datasheet its recommended to keep it above 300mv but is there any way we can move the whole video to 0v. If not to 0V what is the minimum value, we can move the green video without losing any sync. 

Thanks 

Ajay Patra

  • Hey Ajay,

    I believe it shouldn't be an issue but it may be cutting it close depending on your actual signal levels. You're using that bias to shift the signal up so that if you have say a +/-400mV signal then your referenced signal would be seen as -100mV to 700mV. If the negative side is too low, you may bias the ESD cell and wouldn't have the performance you want.


    That being said, since it would be outside our recommended operating conditions, I can't really say for sure or guarantee any behavioral expectations in this way. But in theory I think it should be fine if your voltage is below +/-300mV.

    Thanks, 
    Rami