OPA191_017 Datasheet, PDF (22/51 Pages) Texas Instruments – 36-V, Low Power, Precision, CMOS, Rail-to-Rail Input/Output, Low Offset Voltage, Low Input Bias Current Op Amp

OPA191, OPA2191, OPA4191
SBOS701A – DECEMEBER 2015 – REVISED APRIL 2016
8 Detailed Description
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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
NCH Input
Stage
OPAx191
IN+
36-V
Differential
Front End
IN
Slew
Boost
PCH Input
Stage
t
High
Capacitive Load
Compensation
Output
Stage
VOUT
e-trim
Package Level Trim
22
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