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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.