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 (Ref_A and Ref_B) 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, Sense_A 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.