7 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, as well as validating and testing their design

implementation to confirm system functionality.

7.1 Application Information

Figure 7-1 shows the basic connections required for operation of the INA2128. Applications with noisy or high

impedance power supplies may require decoupling capacitors close to the device pins as shown.

The output is referred to the output reference (Ref) terminals (RefA and RefB) which are normally grounded.

These must be low-impedance connections to assure good common-mode rejection. A resistance of 8 Ω in

series with a Ref pin will cause a typical device to degrade to approximately 80 dB CMR (G = 1).

The INA2128 has separate output sense feedback connections, SenseA and Sense B. These must be connected

to their respective output terminals for proper operation. The output sense connection can be used to sense the

output voltage directly at the load for best accuracy.

7.2 Typical Application

Figure 7-1. Basic Connections

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INA2128

SBOS035B – DECEMBER 1995 – REVISED MAY 2023

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