AD8657
Production
The AD8657/AD8659 are dual and quad micropower, precision,
rail-to-rail input/output amplifiers optimized for low power and wide operating supply voltage...
Datasheet
AD8657 on Analog.com
AD8546
Production
The AD8546 and AD8548 are dual and quad micropower, high input impedance amplifiers optimized for low power and wide operating supply voltage range applications...
Datasheet
AD8546 on Analog.com