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OPA2388IDR Datasheet(PDF) 16 Page - Texas Instruments |
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OPA2388IDR Datasheet(HTML) 16 Page - Texas Instruments |
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16 / 34 page  ±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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