OPAX187 datasheet(24/54 Pages) TI2

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OPA187

15 V

VOUT

VREF

OPA187

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)

OPA187, OPA2187, OPA4187

SBOS807E – DECEMBER 2016 – REVISED MAY 2020

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Product Folder Links: OPA187 OPA2187 OPA4187

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Figure 42 shows an example of how the OPA187 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 to

download the TINA-TI file: Discrete INA.

(1)

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

Figure 42. Discrete INA + Attenuation for ADC With a 3.3-V Supply

8.2.3 Bridge Amplifier

Figure 43 shows the basic configuration for a bridge amplifier. Click the following link to download the TINA-TI

file: Bridge Amplifier Circuit.

Figure 43. Bridge Amplifier

8.2.4 Low-Side Current Monitor

Figure 44 shows the OPA187 configured in a low-side, current-sensing application. The load current (ILOAD)

creates a voltage drop across the shunt resistor (RSHUNT). This voltage is amplified by the OPA187, with a gain of

201. The load current is set from 0 A to 500 mA, and corresponds to an output voltage range from 0 V to 10 V.

The output range can be adjusted by changing the shunt resistor or gain of the configuration. Click the following

link to download the TINA-TI file: Current-Sensing Circuit.

OPAX187 데이터시트(PDF) 24 Page - Texas Instruments

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