OPA4171-Q1 Datasheet, PDF (14/35 Pages) Texas Instruments – OPAx171-Q1 36-V, Single-Supply, General-Purpose Operational Amplifier

OPA171-Q1, OPA2171-Q1, OPA4171-Q1
SBOS556B – JUNE 2011 – REVISED DECEMBER 2014
7 Detailed Description
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7.1 Overview
The OPAx171-Q1 family of operational amplifiers provide high overall performance, making them ideal for many
general-purpose applications. The excellent offset drift of only 1.5 μV/°C (maximum) provides excellent stability
over the entire temperature range. In addition, the device offers very good overall performance with high CMRR,
PSRR, AOL, and superior THD.
7.2 Functional Block Diagram
+
PCH
FF Stage
±
OPA171-Q1
Ca
Cb
+IN
+
+
+
PCH
Input Stage
2^nd Stage
Output
Stage
OUT
±IN
±
±
±
+
NCH
Input Stage
±
7.3 Feature Description
7.3.1 Operating Characteristics
The OPAx171-Q1 family of devices is specified for operation from 2.7 to 36 V (±1.35 to ±18 V). Many of the
specifications apply from –40°C to 125°C. Parameters that can exhibit significant variance with regard to
operating voltage or temperature are shown in the section.
7.3.2 Phase-Reversal Protection
The OPAx171-Q1 family of devices has an internal phase-reversal protection. Many op amps exhibit a phase
reversal when the input is driven beyond its linear common-mode range. This condition is most often
encountered in noninverting circuits when the input is driven beyond the specified common-mode voltage range,
causing the output to reverse into the opposite rail. The input of the OPAx171 family of devices prevents phase
reversal with excessive common-mode voltage. Instead, the output limits into the appropriate rail. Figure 37
shows this performance.
14
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