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Texas Instruments INA239/INA239-Q1 Current/Voltage/Power Monitors are ultra-precise digital power monitors with a 16-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure a full-scale differential input of ±163.84mV or ±40.96mV across a resistive shunt sense element with common-mode voltage support from –0.3V to +85V. The INA239/INA239-Q1 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’s ambient temperature.
The low offset and gain drift design of the Texas Instruments INA239 allows it 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.
