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I need Long Term Stability parameter for the following DAC's : AD5544 AD7847 AD7846
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.