7 Detailed Description

7.1 Overview

The OPAx387 family of zero-drift amplifiers is engineered with state-of-the-art, proprietary, precision zero-drift

technology. These amplifiers offer ultra-low input offset voltage and drift, and achieve excellent input and output

dynamic linearity. The OPAx387 operate from 1.7 V to 5.5 V, are unity-gain stable, and are designed for a wide

range of general-purpose and precision applications. The OPAx387 strengths also include a 5.7-MHz bandwidth,

8.5-nV/√Hz noise spectral density, and no 1/f noise, making the OPAx387 an excellent choice for interfacing with

sensor modules, and buffering high-fidelity, digital-to-analog converters (DACs).

7.2 Functional Block Diagram

+IN

–IN

OUT

Ripple Reduction

Technology

CLK

CLK

GM1

GM2

GM_FF

GM3

CCOMP

CCOMP

OPA387, OPA2387, OPA4387

SBOS984G – NOVEMBER 2020 – REVISED SEPTEMBER 2023

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