[Altor Audio]

Придется вводить просто резистор по неинвертирующему входу 1622 :)

Хм.

It is important to note that
connecting the op amp noninverting input to ground
through a resistor will not cancel bias current errors and
should never be done!

И дальше:

Similarly an offset caused by op
amp bias current should not be adjusted by using the op
amp null pins since this increases offset between DAC
OUT1 and OUT2 pins, causing INL, DNL and gain errors.
If op amp offset error adjustment is required, the op amp
input offset voltage (the voltage difference between OUT1
and OUT2) should be nulled.