A new amplifier with accurate differences of up to +275V has been developed by Texas Instruments Incorporated (TI). The device has a common-mode rejection ratio (CMRR) of 100dB, increases overall measurement accuracy and has a guaranteed 90dB CMRR performance in harsh, hot environments.
The amplifier also lowers initial gain error by some 33 percent while providing twice the slew rate to increase response time and overall system performance.
The INA149 mixes an extended common mode range with a high CMRR for precise measurement of low differential signals in industrial designs. For designs implementing the device, this equates to higher performing and more accurate products.
The device also eliminates the need for multiple additional isolators or multiple power supplies in high common mode voltage applications to reduce component count, improve reliability and simplify system design.
The amplifier can be used in 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.
