I've been doing a lot of research regarding composite video, and as far as I can tell, a better design approach would be to use a dual power supply such that incoming video can avoid all of the problems associated with A/C coupling and clamping.
I'm just looking to switch incoming composite video (no on-board DAC), and the AD8184 looks interesting. It's a little unnerving not to see the coupling caps in the reference design, but in theory this should be better. Of course it means a more expensive power supply, but I'm not sure that I really care.
For reference, all of the video sources should be on the same ground, of course how they are actually implemented is a different story.
Do any of you video engineers think that using the AD8184 (with the AD8009 follower) solely would be a good approach, or should I a/c couple the inputs and put a sync clamp (like a MAX4090) as a previous stage?
I'm especially interested in knowing if there are any regulations that require A/C coupling (like CE/UL/etc).
Every time I think I understand this, I find contradictory application notes.
FWIW, I've read just about everything maxim has put out on the subject, and their ICs seem targeted to the single supply/AC couple designs. Analog seems to take the other route, and I lack the practical experience or test equipment to *know* which approach is better.