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AD8130 Output goes to rail

Question asked by MikeJ on Jun 6, 2012
Latest reply on Jun 15, 2012 by harryh

Hi,

 

I am having some difficulty with the AD8130 in that the output goes to +12V.  I have 7 systems and it happens on all, though it did not initially.

 

It was a bit hit and miss to start with, so I fitted R7 to reference the input, which initially seemed to do the trick.  But now the outputs (pin6) go to rail - removing R7 now has no effect.  I have one PCB that still works (R7 not fitted) when substituted in the system.  I do not understand why this is happening, though I'm tempted to short out C31.  The transmission line from the output is short and goes to a video encoder.

 

Any suggestions?

 

 

Thanks
Mike

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