Description
The INA281-Q1 is a high-precision current sense amplifier that can
measure voltage drops across shunt resistors over a wide
common-mode range from –4 V to 110 V. The negative common-mode
voltage allows the device to operate below ground, thus
accommodating precise measurement of recirculating currents in
half-bridge applications. The combination of a low offset voltage,
small gain error and high DC CMRR enables highly accurate current
measurement. The INA281-Q1 is not only designed for DC current
measurement, but also for high-speed applications (like fast
overcurrent protection, for example) with a high bandwidth of 1.3
MHz and an 65-dB AC CMRR (at 50 kHz).
The INA281-Q1 operates from a single 2.7-V to 20-V supply, drawing
1.5 mA of supply current. The INA281-Q1 is available with five gain
options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. These gain
options address wide dynamic range for current-sensing
applications.
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