When you specify the offset voltages for you part, does the polarity work out so that the Vos is the voltage at the input necessary to "zero" your output, or is the output voltage resulting from grounding your inputs?
In general, most of ADI's offset voltages are specified as +/- so the sign does not matter.
That being said, I believe the latter definition is technically correct. The polarity of the offset voltage is the same as the polarity of the output when both inputs are grounded.
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