OPA191IDBVR datasheet(22/49 Pages) TI1

22 / 49 page

36-V

Differential

Front End

Slew

Boost

High

Capacitive Load

Compensation

e-trim

Package Level Trim

IN+

VOUT

OPAx191

NCH Input

Stage

PCH Input

Stage

Output

Stage

OPA191, OPA2191, OPA4191

SBOS701A – DECEMEBER 2015 – REVISED APRIL 2016

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Product Folder Links: OPA191 OPA2191 OPA4191

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8 Detailed Description

8.1 Overview

The OPAx191 family of operational amplifiers use e-trim, a method of package-level trim for offset and offset

temperature drift implemented during the final steps of manufacturing after the plastic molding process. This

method minimizes the influence of inherent input transistor mismatch, as well as errors induced during package

molding. The trim communication occurs on the output pin of the standard pinout, and after the trim points are

set, further communication to the trim structure is permanently disabled. The Functional Block Diagram section

shows the simplified diagram of the OPA191 with e-trim.

Unlike previous e-trim op amps, the OPAx191 uses a patented two-temperature trim architecture to achieve a

very low offset voltage and low voltage offset drift over the full specified temperature range. This level of

precision performance at wide supply voltages makes these amplifiers useful for high-impedance industrial

sensors, filters, and high-voltage data acquisition.

8.2 Functional Block Diagram

OPA191IDBVR Datasheet(PDF) 22 Page - Texas Instruments