V+

+

+

2 k

470

4.7

200

10 k

Copyright © 2016, Texas Instruments Incorporated

2200 pF

330

1000 pF

10

+

±

21

OPA187, OPA2187, OPA4187

www.ti.com

SBOS807B – DECEMBER 2016 – REVISED OCTOBER 2018

Product Folder Links: OPA187 OPA2187 OPA4187

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Copyright © 2016–2018, Texas Instruments Incorporated

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The OPAx187 operational amplifier combines precision offset and drift with excellent overall performance,

making it ideal for many precision applications. The precision offset drift of only 0.001 µV/°C provides stability

with outstanding low-noise operation. 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.

The following application examples highlight only a few of the circuits where the OPAx187 can be used.

8.2 Typical Applications

8.2.1 High-Side Voltage-to-Current (V-I) Converter

The circuit shown in Figure 41 is a high-side voltage-to-current (V-I) converter. The converter translates an input

voltage of 0 V to 2 V into an output current of 0 mA to 100 mA. Figure 42 shows the measured transfer function

for this circuit. The low offset voltage and offset drift of the OPA2187 facilitate excellent dc accuracy for the

circuit.

Figure 41. High-Side Voltage-to-Current (V-I) Converter