Texas Instruments INA240/INA240-Q1 Current Sense Amplifiers
Texas Instruments INA240/INA240-Q1 Zero-Drift Current Sense Amplifiers are voltage-output, current-sense amplifiers with enhanced PWM rejection. These amplifiers can sense drops across shunt resistors over a wide common-mode voltage range from –4V to 80V, 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 suppression levels for large common-mode transients (ΔV/Δt) in systems that use pulse width modulation (PWM) signals. This feature allows accurate current measurements without large transients and associated recovery ripple on the output voltage. The Texas Instruments INA240-Q1 devices are AEC-Q100 qualified for automotive applications.
Features
- Enhanced PWM rejection
- Excellent CMRR
- 132dB DC CMRR
- 93dB AC CMRR at 50kHz
- –4V to 80V wide Common-Mode range
- Accuracy
- Gain
- 0.20% (max) gain error
- 2.5ppm/°C (max) gain drift
- Gain
- Offset
- ±25µV (max) offset voltage
- 250nV/°C (max) offset drift
- Available gains
- INA240A1: 20V/V
- INA240A2: 50V/V
- INA240A3: 100V/V
- INA240A4: 200V/V
- 2.4mA (max) quiescent current
Applications
- Motor controls
- Solenoid and valve controls
- Power management
- Actuator controls
- Pressure regulators
- Telecom equipment
Functional Block Diagram
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Published: 2016-12-28
| Updated: 2023-06-07