ADC

ENABL E

VS

OUT

REF

GND

IN+

IN±

LOA D

Microco ntr oller

Sup ply Vo ltag e

1.7 V to 5.5 V

Bus Voltage

±0.2 V to +40 V

0.5 nA

(typ)

0.5 nA

(typ)

0.1 …F

INA190

20

INA190

SBOS863C – MARCH 2018 – REVISED APRIL 2019

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Product Folder Links: INA190

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Copyright © 2018–2019, Texas Instruments Incorporated

8 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. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The INA190 amplifies the voltage developed across a current-sensing resistor as current flows through the

resistor to the load or ground. The high common-mode rejection of the INA190 make it usable over a wide range

of voltage rails while still maintaining an accurate current measurement.

8.1.1 Basic Connections

Figure 39 shows the basic connections of the INA190. Place the device as close as possible to the current sense

resistor and connect the input pins (IN+ and IN–) to the current sense resistor through kelvin connections. The

ENABLE pin must be controlled externally or connected to VS if not used.

NOTE: To help eliminate ground offset errors between the device and the analog-to-digital converter (ADC), connect

the REF pin to the ADC reference input. When driving SAR ADCs, filter or buffer the output of the INA190 before

connecting directly to the ADC.

Figure 39. Basic Connections for the INA190