Most of the AD55xx Iout DACs are not suitable to be used with IOUT2 (AGND) biased above ground.
For AD5555, the highest voltage that you can raise on the AGND pin 0.5V provided VDD is 5V and is very stable.
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If you are using or plan to use the AD5415 12-bit DAC chip in a daisy-chain configuration, you need to read page 20 of the marked up data sheet attached. If you are using the SDO output of even a single AD5415, then you also need to see the erratum marked…