SBOS386A May 2019 – May 2020 INA186-Q1
The low input bias current of the INA186-Q1 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 35. As a result of the differential input impedance of the INA186-Q1, limit the value of RSENSE to 1 kΩ or less for best accuracy.