The page 8 of AD7091R-5 datasheet describes VDrive as "The voltage range on this pin is 1.8 V to 5.25 V and may differ from the voltage range at VDD, but must never exceed it by more than 0.3 V", however AD7091R does not have this limitation.  Could ADI confirm the VDrive limitation for AD7091R-5 is correct.