INA190 datasheet(15/48 Pages) TI2

15 / 48 page

Bus Suppl y

up to +40 V

High-Side Se nsing

Low-Side Se nsing

LOA D

Commo n-mode volta ge (VCM)

is b us-voltage depen dent.

Commo n-mode volta ge (VCM)

is a lwa ys n ear groun d a nd is

isolated fro m bus-voltage sp ikes.

IN+

RSENS E

IN±

IN+

IN±

INA190

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SBOS863D – MARCH 2018 – REVISED NOVEMBER 2019

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Feature Description (continued)

7.3.5 High-Side and Low-Side Current Sensing

The INA190 supports input common-mode voltages from –0.2 V to +40 V. Because of the internal topology, the

common-mode range is not restricted by the power-supply voltage (VS). The ability to operate with common-

mode voltages greater or less than VS allows the INA190 to be used in high-side and low-side current-sensing

applications, as shown in Figure 34.

Figure 34. High-Side and Low-Side Sensing Connections

7.3.6 High Common-Mode Rejection

The INA190 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 INA190 is approximately 150 dB. The ability to reject changes in the dc common-mode voltage

allows the INA190 to monitor both high- and low-voltage rail currents with very little change in the offset voltage.

7.3.7 Rail-to-Rail Output Swing

The INA190 allows linear current-sensing operation with the output close to the supply rail and ground. The

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

GND is only GND + 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.

INA190 Datasheet(PDF) 15 Page - Texas Instruments