ENABLE

VS

OUT

REF

GND

IN+

IN±

LOAD

0.1 F

5 V

12 V

INA190

25

INA190

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SBOS863C – MARCH 2018 – REVISED APRIL 2019

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8.2 Typical Applications

The low input bias current of the INA190 allows accurate monitoring of small-value currents. To accurately

monitor currents in the microamp range, increase the value of the sense resistor to increase the sense voltage

so that the error introduced by the offset voltage is small. The circuit configuration for monitoring low-value

currents is shown in Figure 44. As a result of the differential input impedance of the INA190, limit the value of

Figure 44. Microamp Current Measurement

8.2.1 Design Requirements

The design requirements for the circuit shown in Figure 44, are listed in Table 1

Table 1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

5 V

12 V

1 µA

150 µA

Device gain (GAIN)

25 V/V

0 V

Amplifier current in sleep or disabled state

< 1 µA