I thing about nulling Input Offset Voltage using digital potenciometer.
How calculate potenciometer value for nulling input offset AD8610?
Or different way, how nulling Input Offset over nulling pin, with DAC?
The offset adjust pins have a four resistor circuit in each emitter of the active load for the
FET diff pair. The resistors are laser trimmed, so there is no formula. With the manual pot
shown, the adjustment range is a few millivolts. Adjusting the offset will also affect the
Vos tempco, so we do not recommend using any op amp adjust circuitry as an overall
signal chain system adjust.
If you use a digital pot, you have the voltage level interfacing problem with the digital
signals. Also, digital pots have capacitance on each terminal, so you will be putting
capacitance on each offset pin that will affect the response of the op amp.
Thanks for information,
I will use External Offset Trim Methods over positive input of amplifier.
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