Can you provide details on the power-on reset and bownout functions of the AD5444/AD5446?
Could vary depending on the process used for a part.
But you can refer to this link for a typical threshold levels.
The power-on circuitry basically guarantees that upon power-up, or a power cycle happens (on-off-on), zero-scale will be loaded into the DAC register and Iout lines.
Thanks but can you provide some specifics like the threshold(s) of the POR and brown out?