V+

ILOAD

A1

A2

Q1

Q2

+

+

+

±

VIN

RLOAD

RS1

RS2

RS3

IRS1

IRS2

IRS3

VRS2

VRS3

VRS1

VLOAD

V+

C6

C7

R3

R5

R4

R2

470

4.7

2200 pF

330

10 k

200

1000 pF

10 k

2 k

Copyright © 2016, Texas Instruments Incorporated

21

OPA2188

www.ti.com

SBOS525C – AUGUST 2011 – REVISED JUNE 2016

Product Folder Links: OPA2188

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Copyright © 2011–2016, Texas Instruments Incorporated

9 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.

9.1 Application Information

9.2 Typical Applications

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

The circuit shown in Figure 44 is a high-side voltage-to-current (V-I) converter. It translates in input voltage of 0 V

to 2 V to and output current of 0 mA to 100 mA. Figure 45 shows the measured transfer function for this circuit.

The low offset voltage and offset drift of the OPA2188 facilitate excellent dc accuracy for the circuit.

Figure 44. High-Side Voltage-to-Current (V-I) Converter