+IN

±IN

OUT

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Ripple Reduction

Technology

CLK

CLK

Low-noise

Charge-pump

GM1

GM2

GM_FF

GM3

15

OPA388, OPA2388, OPA4388

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SBOS777 – DECEMBER 2016

Product Folder Links: OPA388 OPA2388 OPA4388

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7 Detailed Description

7.1 Overview

The OPAx388 family of zero-drift amplifiers is engineered with the unique combination of a proprietary precision

auto-calibration technique paired with 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 operates

from 2.5 V to 5.5 V, is unity-gain stable, and is suitable 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

strengths also include 10-MHz bandwidth, 7-nV/

√Hz noise spectral density, and no 1/f noise, making the

OPAx388 optimal for interfacing with sensor modules and buffering high-fidelity, digital-to-analog converters

(DACs).

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Operating Voltage

The OPA3x88 family of operational amplifiers can be used with single or dual supplies from an operating range

device (see Absolute Maximum Ratings). Key parameters that vary over the supply voltage or temperature range

are shown in the Typical Characteristics section.