AD7988 data sheet to the Reference Load Current (VREF = 5V) has been described as 250uA (Typ).
The power dissipation has been described as REF Only 34uA (170uW / 5V), does not match with the above.
I would like to know the current necessary to the VREF pin, which is correct you do?
AD7982 data sheet looks to be correct.
Also, please tell me the max value of the current consumption because it is not necessary to guarantee.