OPA4187IPW.B datasheet(22/54 Pages) TI2

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V+

ILOAD

VIN

RLOAD

RS1

2 k

RS2

470

RS3

4.7

IRS1

IRS2

IRS3

VRS2

VRS3

VRS1

VLOAD

200

10 k

2200 pF

330

1000 pF

OPA187, OPA2187, OPA4187

SBOS807E – DECEMBER 2016 – REVISED MAY 2020

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Product Folder Links: OPA187 OPA2187 OPA4187

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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 family combines precision offset and drift with excellent overall performance,

making this device an excellent choice for many precision applications. The precision offset drift of only 0.001

µV/°C provides stability over the entire temperature range. In addition, the device pairs excellent CMRR, PSRR,

and AOL dc performance 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 40 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 41 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 40. High-Side Voltage-to-Current (V-I) Converter

OPA4187IPW.B Datasheet(PDF) 22 Page - Texas Instruments

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