OPA388_17 Datasheet, PDF (15/34 Pages) Texas Instruments – Precision, Zero-Drift, Zero-Crossover, True Rail-to-Rail Input/Output, Operational Amplifiers

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7 Detailed Description
OPA388, OPA2388, OPA4388
SBOS777 – DECEMBER 2016
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
Low-noise
Charge-pump
GM_FF
CLK
CLK
CCOMP
+IN
±IN
GM1
GM2
GM3
OUT
Ripple Reduction
Technology
CCOMP
Copyright © 2016, Texas Instruments Incorporated
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
of V_S = 2.5 V (±1.25 V) up to 5.5 V (±2.75 V). Supply voltages greater than 7 V can permanently damage the
device (see Absolute Maximum Ratings). Key parameters that vary over the supply voltage or temperature range
are shown in the Typical Characteristics section.
Copyright © 2016, Texas Instruments Incorporated
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Product Folder Links: OPA388 OPA2388 OPA4388