The AD8031 is a good fit for the AD7091R as a driver amplifier. The AD8031
draws typically 750uA of current and can operate from 2.7V to 12V with fast
settling times to allow for 1 MSPS sampling rate. The Cftl CN0247 can be viewed
at the following location:
This is a reference design showing performance with the AD7091R and the AD8031.
The evaluation board EVAL-AD7091RSDZ also has this combination on board for