Answer:
The change in offset due to temperature can be estimated by multiplying the change in temperature relative to 25 degrees by the input offset drift term. The change in offset due to temperature adds to the initial room temperature offset voltage. The drift term can be calculated by finding the slope of the graph below, which can be found in the datasheet: ADCMP391/ADCMP392/ADCMP393 (Rev. D):
The approximate drift term is found to be:
The offset is then calculated as follows ( the example is for a temperature of 85 degrees Celsius) :
So, this device has a maximum offset voltage of 0.608milliV, when operating at 85 degrees.