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Problems interfacing AD623 with AD8561 comparator.

Question asked by cholmste on Sep 22, 2011
Latest reply on Sep 23, 2011 by cholmste

I ran into an issue when interfacing the AD623 with the AD8561 comparator.

Pin 3 of the comparator (negative input) is 'feeding' or is biased at ~1.4V. This seems to cause problems with the AD623 driving the input of the comparator.

 

The AD623 can drive loads of 10kohm or greater.

The AD8561 has a PNP differential stage input.

 

Does this means that the AD623 output is incompatible with the AD8561 input and an extra buffer is needed between the two?

 

Thank you in advance.

Christian

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