The INA238 is an ultra-precise
digital power monitor with a 16-bit delta-sigma ADC specifically designed for current-sensing
applications. The device can measure a full-scale differential input of ±163.84 mV
or ±40.96 mV across a resistive shunt sense element with common-mode voltage support
from –0.3 V to +85 V.The INA238 reports
current, bus voltage, temperature, and power, all while performing the needed calculations in the background.
The integrated temperature sensor is ±1°C accurate for die temperature measurement
and is useful in monitoring the system ambient temperature.The low offset and gain drift design of the INA238 allows the device to be used in precise systems that do not
undergo multi-temperature calibration during manufacturing. Further, the very low
offset voltage and noise allow for use in A to kA sensing applications and provide a wide dynamic range without
significant power dissipation losses on the sensing shunt element. The low input
bias current of the device permits the use of larger current-sense resistors, thus
providing accurate current measurements in the micro-amp range.The device allows for selectable ADC conversion
times from 50 µs to 4.12 ms as well as sample averaging from 1x to 1024x, which
further helps reduce the noise of the measured data.
