I am just studing your AD8195.
The output DDC is 3.3V.
I will connect this to 5V inpout device.
The signal that receive by buffer will output via HDMI connector, and connect to external cable.
So the signal will be toss to the next device.
That the next device will be Vh=5Vx 0.7, and VL=5Vx0.3 threshold voltage H and L.
The best solution in this case is that put the level translater device such as your AD8275, correct?
Please give me your good advice.