LINEAR TECHNOLOGY LT1638/LT1639 handbook
Datasheet
LT1638/LT1639 are super micro power rail-to-rail input and output operational amplifiers with a frequency of 1.2MHz and a slew rate of 0.4V/µs. They operate with inputs above V+, have low power consumption, high output current, etc. They are suitable for portable instrumentation, sensor conditioning, battery monitoring, micro power active filters, 4mA to 20mA transmitters, etc.