I'm using the AD8192 in cascade(3) and it works very well for the video.
But i have to manage some issue with the selected DDC channel. Sometimes the EDID is ok and sometimes there is errors (bad checksum !).
i use a video generator on the input and i force it to read the edid from the tv screen connected on the output of the AD8192
The DDC input of the AD8192 is connected with pull-up(47k) and the VREFAB and VREF_COM is at 5V.
I put my scope on the clock and the data and something is strange in the input of the selected DDC port.
There is a glich of 100ns at each rise front of the clock followed by a level of 2.5V during 200ns and after the level is correct.
Any idea of this strange beahavior ?
see attached file.