The Analog Devices OP181 GP is an ultra-low power operational amplifier featuring rail-to-rail output. It
requires less than 4 ìA of quiescent current and employs a bipolar differential pair in its input stage [1].
The output stage consists of a pair of CMOS transistors in a common source configuration. The device
operates from supplies as low as 2 V and is specified at +3 V and +5 V single supply as well as ±5 V dual
supplies. The operating temperature limits of these parts is specified between –40°C and +85°C, and the
devices are typically used in battery and power supply control, signal conditioning, remote sensing, and
transducer interface in very low power systems.