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Current shunt monitor offers 10x greater accuracy

Posted: 30 Aug 2011     Print Version  Bookmark and Share

Keywords:shunt monitor  I2C interface  10x greater accuracy 

Texas Instruments Inc. introduces the INA226, claimed as the industry's most accurate current shunt monitor to offer 10x greater accuracy than major competitors.

Current shunt monitor

The INA226 features 16bit, single-chip digital solution with I2C interface to provide current, voltage and power measurements, simplifying board design and layout constraints with no external mux or ADC required.

The INA226 also features maximum offset voltage of 10µV and a maximum gain error of 0.1 per cent to offer greater precision at low currents and allows for using smaller shunt resistors, reducing I*R loss. The INA226 claims to benefit designers working with servers, telecom equipment, computers, power management devices and testing equipment, where accurate power measurements are crucial.

Its independently programmable conversion times and sample averaging make it easy to customise to the speed requirements of each system, and reduce software and memory requirements. The INA226 offers maximum quiescent current of 420µA and maximum shutdown current of 2µA that result in efficient operation to consumes 3.5 per cent less power than competitors' discrete solutions, even with the INA226's integrated ADC and power mux. Its 140dB common mode rejection ratio (CMRR) and 36V common mode voltage (CMV) ensure that there is little to no change in offset voltage throughout the entire range of operation, simplifying error analysis.

The INA226 is available now in a 10pin MSOP package, priced at Rs.58.30 ($1.30) in quantities of 1,000.An evaluation model is available for the INA226, priced at Rs.3,363.23 ($75), featuring a USB interface and software for configuring and monitoring the performance of the device. An IBIS model is also available for designers to evaluate the INA226.

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