Texas Instruments has introduced the INA226 current shunt monitor with a maximum offset voltage of 10µV and a maximum gain error of 0.1%. The 16bit, single-chip monitor provides programmable measurements for current, voltage and power across a digital I2C interface. It is suitable for applications in servers, telecomms equipment, computers, power management devices and testing equipment. According to the company, the monitor allows for using small shunt resistors, thus reducing IR loss. The monitor has independently programmable conversion times and sample averaging, which is claimed to reduce software and memory requirements. It also has a maximum quiescent current of 420µA and maximum shutdown current of 2µA. The monitor also features a 140dB CMRR (common mode rejection ratio) and 36V CMV (common mode voltage).
