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Difference amplifier features 100dB CMRR

Posted: 23 Dec 2011     Print Version  Bookmark and Share

Keywords:difference amplifier  common-mode voltage applications  electric vehicles 

Texas Instruments Inc. (TI) debuts the INA149, which is claimed as the most accurate difference amplifier for high common-mode voltage applications up to ±275V targeted at 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.


The INA149 offers a CMRR of 100dB, thereby increasing overall measurement accuracy by 2x.

Offering a common-mode rejection ratio (CMRR) of 100dB, the INA149 is said to increase overall measurement accuracy by 2x compared to the competition and is touted as the first high-voltage difference amplifier with a specified minimum 90dB CMRR performance in harsh, high-temperature environments up to 125°C. The amplifier also lowers initial gain error by 33 per cent compared to the competition, while providing twice the slew rate to increase response time and overall system performance.

The INA149 boasts a lower maximum initial gain error of 0.02 per cent that provides better accuracy, especially in applications with lower common-mode voltage signals.

TI offers a variety of tools and support to speed development with the INA149, including an evaluation module (INA149EVM), which can be ordered today for Rs.2,197.31 ($49), and a TINA-TI SPICE model to simulate device performance.

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