OPA189 Datasheet, PDF (12/34 Pages) Texas Instruments – Precision, 36-V, 14-MHz, MUX-Friendly Low-Noise, Rail-to-Rail Output, Zero-Drift Operational Amplifiers

OPA189, OPA2189, OPA4189
SBOS830 – JUNE 2017
8 Detailed Description
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8.1 Overview
The OPAx189 operational amplifier combines precision offset and drift with excellent overall performance,
making the device well-suited for many precision applications. The precision offset drift of only 0.0035 µV/°C
provides stability over the entire temperature range. In addition, this device offers excellent linear performance
with high CMRR, PSRR, and A_OL. As with all amplifiers, applications with noisy or high-impedance power
supplies require decoupling capacitors close to the device pins. In most cases, 0.1-µF capacitors are adequate.
See Layout Guidelines for details and layout example.
The OPAx189 is part of a family of zero-drift, MUX-friendly, rail-to-rail output operational amplifiers. These
devices operate from 4.5 V to 36 V, are unity-gain stable, and are suitable for a wide range of general-purpose
and precision applications. The zero-drift architecture provides ultra-low input offset voltage and near-zero input
offset voltage drift over temperature and time. This choice of architecture also offers outstanding ac performance,
such as ultra-low broadband noise, zero flicker noise, and outstanding distortion performance when operating
below the chopper frequency.
8.2 Functional Block Diagram
Figure 3 shows a representation of the proprietary OPAx189 architecture.
Slew Boost
Circuitry
+IN
36-V Differential
Front End
±IN
CLK
CLK
CCOMP
GM1
Ripple Reduction
Technology
GM2
GM3
CCOMP
OUT
Figure 3. Functional Block Diagram
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Product Folder Links: OPA189 OPA2189 OPA4189