OPA188

15 V

15 V

VOUT

R

R1

R

R

R

VREF

R1

Copyright © 2016, Texas Instruments Incorporated

OPA188

-15 V

15 V

U3

OPA188

15 V

-15 V

U2

+

VCM

10

-VDIFF / 2

V

DIFF / 2

R

10 kW

5

R

10 kW

7

R

500 W

G

V

P

OUT

V

N

OUT

U1

INA159

5 V

V

OUT

(1)

Ref 1

Ref 2

Sense

22

OPA188

SBOS642C – MARCH 2013 – REVISED JANUARY 2020

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Product Folder Links: OPA188

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Copyright © 2013–2020, Texas Instruments Incorporated

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

NOTE

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

(from DesignSoft™) or TINA-TI software be installed. Download the free TINA-TI software

from the TINA-TI folder.

Figure 46 shows an example of how the OPA188 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 easily interface with 3.3-V or 5-V analog-to-digital converters (ADCs). Click the following link to

download the TINA-TI file: Discrete INA.

(1)

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

Figure 46. Discrete INA + Attenuation for ADC With 3.3-V Supply

9.2.3 Bridge Amplifier

Figure 47 shows the basic configuration for a bridge amplifier. Click the following link to download the TINA-TI

file: Bridge Amplifier Circuit.

Figure 47. Bridge Amplifier