I need Long Term Stability parameter for the following DAC's :
The long term drift over time is included in the max and min specifications of
the part. For example, we guarantee that the full-scale gain error of the
AD5544 will never be more than +/-3mV over the lifetime of the part and over
temperature. We do not spec how the gain error will change over time, we
guarantee it will never be more than +/-3mV.
A conservative design will work to the max/min specifications.