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ADV7611 supply filtering and digital outputs

Question asked by RaymondVermeulen on Dec 17, 2012
Latest reply on Dec 20, 2012 by GuenterL

Hello to you all,

 

I'm designing a circuit containing the ADV7611 together with an intern of mine.

And we had a few questiones that we couldn't find a direct answer to in datasheets and such.

 

- Supply filtering, I've seen a recomended ferrite/capasitor combination filter which was pretty expensive.

We wanted to use a regular ferrite bead and capacitors. Could any of you recommend a resistance @ 100MHz value? Or a type you have succesfully used in the past.

 

- Digital output impedances. I think it would be best to approach these as single ended transmission lines. But I don't know where to start. What kind of cable impedance is most often used? Also has anyone checked what kind of output impedance these ports have? So to match a 100Ohm cable I would add a 75Ohm to the, perhaps 25Ohm output pin? Just an example.

 

Anyway, thank you for reading this and sharing your knowledge. 

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