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Problems interfacing AD623 with AD8561 comparator.

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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