OPA187

15 V

15 V

R

R

R

R

R

R

±

Copyright © 2016, Texas Instruments Incorporated

OPA187

OPA187

15 V

- 15 V

+

5 V

10V

15 V

15 V

Ref 1

Ref 2

INA159

Sense

500

Ÿ

10

NŸ

10

NŸ

(1)

Copyright © 2016, Texas Instruments Incorporated

22

OPA187, OPA2187, OPA4187

SBOS807 – DECEMBER 2016

www.ti.com

Product Folder Links: OPA187 OPA2187 OPA4187

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Copyright © 2016, Texas Instruments Incorporated

8.2.2 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 43 shows an example of how the OPAx187 is used as a high-voltage, high-impedance front-end for a

precision, discreet 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

download the TINA-TI file: Discrete INA.

(1)

Figure 43. Discrete INA + Attenuation for ADC With 3.3-V Supply

8.2.3 Bridge Amplifier

Figure 44 shows the basic configuration for a bridge amplifier. Click the following link to download the TINA-TI

file: Bridge Amplifier Circuit.

Figure 44. Bridge Amplifier