The INA240 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 package.
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