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OPA2388IDR Datasheet(PDF) 16 Page - Texas Instruments

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Part No. OPA2388IDR
Description  Precision, Zero-Drift, Zero-Crossover, True Rail-to-Rail Input/Output, Operational Amplifiers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

OPA2388IDR Datasheet(HTML) 16 Page - Texas Instruments

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±140
±120
±100
±80
±60
±40
±20
0
10
100
1k
10k
Frequency (Hz)
C004
Traditional Rail-to-Rail
Input Stage
OPA388 Zero-Crossover Input Stage
±20
±15
±10
±5
0
5
10
15
20
±3
±2
±1
0
1
2
3
Input Common-mode Voltage (V)
Complementary Input Stage
OPA388 Zero-Crossover Input Stage
C003
V
CM = ±2.85 V
V
CM = 2.85 V
16
OPA388, OPA2388, OPA4388
SBOS777 – DECEMBER 2016
www.ti.com
Product Folder Links: OPA388 OPA2388 OPA4388
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
Feature Description (continued)
7.3.2 Input Voltage and Zero-Crossover Functionality
The OPAx388 input common-mode voltage range extends 0.1 V beyond the supply rails. This amplifier family is
designed to cover the full range without the troublesome transition region found in some other rail-to-rail
amplifiers. Operating a complementary rail-to-rail input amplifier with signals traversing the transition region
results in unwanted non-linear behavior and polluted spectral content. Figure 37 and Figure 38 contrast the
performance of a traditional complementary rail-to-rail input stage amplifier with the performance of the zero-
crossover OPA388. Significant harmonic content and distortion is generated during the differential pair transition
(such a transition does not exist in the OPA388). Crossover distortion is eliminated through the use of a single
differential pair coupled with an internal low-noise charge pump. The OPAx388 maintains noise, bandwidth, and
offset performance throughout the input common-mode range, thus reducing printed circuit board (PCB) and bill
of materials (BOM) complexity through the reduction of power-supply rails.
Figure 37. Input Crossover Distortion Nonlinearity
Figure 38. Input Crossover Distortion Spectral Content


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