The document is a data sheet for the OP400 quad low offset, low power operational amplifier by Analog Devices.
It includes information about the features, functional block diagrams, general description, revision history, specifications, electrical characteristics, applications, outline dimensions, and ordering guide.
The OP400 is the first monolithic quad operational amplifier that features OP77-type performance, with precision performance not being sacrificed to obtain space and cost savings.
It features low input offset voltage, low offset voltage drift, low supply current, high open-loop gain, low noise voltage density, and stability with large capacitive loads.
The document also includes a revision history and detailed electrical characteristics for the OP400.