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Overshoot and Undershoot on ADV7611 signals

Question asked by sadatan on Feb 1, 2018
Latest reply on Apr 6, 2018 by sadatan

I had implemented ADV7611 on my board to convert HDMI input to TTL which is further being connected to a processor. We are facing below issue:

1. ADV7611 is outputting waveform for all the data lines, clock line, Hsync and Vsync with very high overshoot and undershoot.

2.Initially we though there is some that there is some impedance  matching issue and tried reducing  the drive strength of the signal but we found that the signal is with in range on processor side after the series termination  (external 75 ohm) but is still having overshoot and undershoot on ADV7611 side.

3. Then we had disconnected the signals from processor side and checked the signal but found that the chip itself is outputting the signal with overshoot and undershoot.

 

Signals are attached here for reference. Please let me know what could be the issue. Is there any software setting we can do to reduce this.

 

Regards,

Sadatan

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