OPA189IDBVT datasheet(30/58 Pages) TI2

Part #	OPA189IDBVT

Description	OPAx189 Precision, Lowest-Noise, 36-V, Zero-Drift, 14-MHz, MUX-Friendly, Rail-to-Rail Output Operational Amplifiers

PDF	58 Pages

Scroll/Zoom	100%

Manufacturer	TI2 [Texas Instruments]

Direct Link	https://www.ti.com

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9.2.2 Discrete INA + Attenuation for ADC With 3.3-V Supply

Note

The TINA-TI™ software files shown in the following sections require that either the TINA™ software

(from DesignSoft™) or TINA-TI simulation software be installed. See Section 12.1.1.1 for more

information.

Figure 9-3 shows an example of how the OPAx189 is used as a high-voltage, high-impedance front end for a

precision, discrete instrumentation amplifier with attenuation. The INA159 provides the attenuation that allows

this circuit to simply interface with 3.3-V or 5-V analog-to-digital converters (ADCs). Click the following link

download the TINA-TI software file: Discrete INA.

OPAx189

15 V

- 15 V

5 V

VCM

10V

VDIFF / 2

±VDIFF / 2

15 V

VOUTP

VOUTN

Ref 1

Ref 2

INA159

Sense

500 Ÿ

10 NŸ

VOUT

(1)

(1) VOUT = VDIFF × (41 / 5) + (Ref 1) / 2.

Figure 9-3. Discrete INA + Attenuation for ADC With 3.3-V Supply

OPA189, OPA2189, OPA4189

SBOS830I – SEPTEMBER 2017 – REVISED OCTOBER 2021

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OPA189IDBVT Datasheet(PDF) 30 Page - Texas Instruments