Bus Suppl y

up to +40 V

High-Side Se nsing

Low-Side Se nsing

LOA D

is b us-voltage depen dent.

is a lwa ys n ear groun d a nd is

isolated fro m bus-voltage sp ikes.

IN+

IN±

IN+

IN±

8

INA191

SLYS020 – FEBRUARY 2019

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Feature Description (continued)

Figure 1. High-Side and Low-Side Sensing Connections

7.3.5 High Common-Mode Rejection

The INA191 uses a capacitively coupled amplifier on the front end; therefore, dc common-mode voltages are

blocked from downstream circuits, resulting in very high common-mode rejection. Typically, the common-mode

rejection of the INA191 is approximately 140 dB. The ability to reject changes in the dc common-mode voltage

allows the INA191 to monitor both high and low voltage rail currents with very little change in the offset voltage.

7.3.6 Rail-to-Rail Output Swing

The INA191 supports linear current-sensing operation with the output close to the supply rail and ground. The

maximum specified output swing to the positive rail is 40 mV, and the maximum specified output swing to GND is

only 1 mV. The close-to-rail output swing is useful to maximize the usable output range particularly when

operating the device from a 1.8-V supply.