R

R

R

R

+5V

Copyright © 2016, Texas Instruments Incorporated

1.65

-1.0

-0.5

0

0.5

1.0

0

3.30

Input Current (A)

21

OPA388, OPA2388, OPA4388

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SBOS777A – DECEMBER 2016 – REVISED JULY 2018

Product Folder Links: OPA388 OPA2388 OPA4388

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Copyright © 2016–2018, Texas Instruments Incorporated

Typical Application (continued)

the nearest standard value. Therefore, the ideal gain of the difference amplifier is 15.4 V/V.

were selected. This configuration reduces the likelihood that the design requires a two-point calibration. A simple

one-point calibration, if desired, removes the offset errors introduced by the 0.5% resistors.

8.2.3 Application Curve

Figure 42. Bidirectional Current-Sensing Circuit Performance:

Output Voltage vs Input Current

8.3 System Examples

8.3.1 Single Operational Amplifier Bridge Amplifier

Figure 43 shows the basic configuration for a bridge amplifier.

Figure 43. Single Operational Amplifier Bridge Amplifier Schematic