7 Detailed Description

7.1 Overview

The OPAx388-Q1 zero-drift amplifiers are engineered with the unique combination of a proprietary precision

auto-calibration technique and a low-noise, low-ripple, input charge pump. These amplifiers offer ultra-low input

offset voltage and drift and achieve excellent input and output dynamic linearity. The OPAx388-Q1 operate from

2.5 V to 5.5 V, are unity-gain stable, and are designed for a wide range of general-purpose and precision

applications. The integrated, low-noise charge pump allows true rail-to-rail input common-mode operation

without distortion associated with complementary rail-to-rail input topologies (input crossover distortion). The

OPAx388-Q1 strengths also include 10-MHz bandwidth, 7-nV/√ Hz noise spectral density, and no 1/f noise,

making these devices 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

Copyright © 2016, Texas Instruments Incorporated

Ripple Reduction

Technology

CLK

CLK

Low-noise

Charge-pump

GM1

GM2

GM_FF

GM3

OPA388-Q1, OPA2388-Q1

SBOS989A – AUGUST 2020 – REVISED NOVEMBER 2021

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Product Folder Links: OPA388-Q1 OPA2388-Q1