OPA2191 datasheet(28/57 Pages) TI

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Input Offset Voltage vs Vcm

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Input Offset Voltage vs Vcm

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TM Integrated Circuit

OPA191, OPA2191, OPA4191

SBOS701C – DECEMEBER 2015 – REVISED OCTOBER 2019

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Product Folder Links: OPA191 OPA2191 OPA4191

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8.3.6 Common-Mode Voltage Range

The OPAx191 is a 36-V, true rail-to-rail input operational amplifier with an input common-mode range that

extends 100 mV beyond either supply rail. This wide range is achieved with paralleled complementary N-channel

and P-channel differential input pairs, as shown in Figure 58. The N-channel pair is active for input voltages

close to the positive rail, typically (V+) – 3 V to 100 mV above the positive supply. The P-channel pair is active

for inputs from 100 mV below the negative supply to approximately (V+) – 1.5 V. There is a small transition

region, typically (V+) –3 V to (V+) – 1.5 V in which both input pairs are active. This transition region varies

modestly with process variation. Within this region PSRR, CMRR, offset voltage, offset drift, noise, and THD

performance are degraded compared to operation outside this region.

Figure 58. Rail-to-Rail Input Stage

To achieve the best performance for two-stage rail-to-rail input amplifiers, avoid the transition region when

possible. The OPAx191 uses a precision trim for both the N-channel and P-channel regions. This technique

enables significantly lower levels of offset than previous-generation devices, causing variance in the transition

region of the input stages to appear exaggerated relative to offset over the full common-mode range, as shown in

Figure 59.

Figure 59. Common-Mode Transition vs Standard Rail-to-Rail Amplifiers

OPA2191 Datasheet(PDF) 28 Page - Texas Instruments

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