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ADV7610 problem with drive strength over long coax cable

Question asked by epos2 on Mar 23, 2017
Latest reply on Mar 23, 2017 by epos2

Hello,

 

It looks like I'm out of luck with my current design as I'm using a multiplexed bus with some coaxial cables to connect the ADV7610 video output to a microprocessor. Long story short, when the output clock is > 100 MHz and I'm adding this cable (used to multiplex the video bus) the clock output doesn't seem to have enough strength to drive the clock succesfully. I see a ~2.3Vpp with ~300mV offset waveform instead of a 3.3Vpp with ~0 offset I would usually see for example decreasing clock.

 

I've tried setting the pin drive strength to its maximum allowed value, but it's not enough. 

 

I don't think I can do anything to solve this with the ADV7610. Should I move on to other chips? Suggestions? Or am I gonna encounter the same problems?

Thanks

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