The INA240 device is a voltage-output, current-sense
amplifier with enhanced PWM rejection that can sense drops across shunt resistors over a wide
common-mode voltage range from –4 V to 80 V, independent of the supply voltage. The negative
common-mode voltage allows the device to operate below ground, accommodating the flyback period of
typical solenoid applications. Enhanced PWM rejection provides high levels of suppression for large
common-mode transients (ΔV/Δt) in systems that use pulse width modulation (PWM) signals (such as
motor drives and solenoid control systems). This feature allows for accurate current measurements
without large transients and associated recovery ripple on the output voltage.
This device operates from a single 2.7-V to 5.5-V power supply, drawing
a maximum of 2.4 mA of supply current. Four fixed gains are available: 20 V/V, 50 V/V,
100 V/V, and 200 V/V. The low offset of the zero-drift architecture enables current sensing with
maximum drops across the shunt as low as 10-mV full-scale. All versions are specified over the
extended operating temperature range (–40°C to +125°C), and are offered in an 8-pin TSSOP and 8-pin
SOIC packages.
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