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TI: high-voltage difference amplifier for common-mode voltages up to +275 V

Texas Instruments introduced a difference amplifier for high common-mode voltage applications up to +275 V. With a common-mode rejection ratio of 100 dB, the INA149 increases overall measurement accuracy and is the first high-voltage difference amplifier with a specified minimum 90-dB CMRR performance in harsh, high-temperature environments up to 125 °C. The amplifier also lowers initial gain error by 33 percent compared to the competition, while providing twice the slew rate to increase response time and overall system performance.

The INA149 can be used in a variety of high common-mode-voltage applications, such as high-voltage current sensing; battery cell voltage monitoring in photovoltaic, telecom, electric vehicles, and alternative energy applications; power-supply current monitoring; and motor control. TI offers a variety of tools and support to speed development with the INA149, including an evaluation module (INA149EVM), and a TINA-TI SPICE model to simulate device performance. The INA149 is available in a  4.9 x 6-mm SOIC package.

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