INA241B1IDDFR

The INA241x is an ultra-precise, bidirectional current sense amplifier than can measure voltage drops across shunt resistors over a wide common-mode range from -5 V to 110 V, independent of the supply voltage. The high-precision current measurement is achieved through a combination of low offset voltage (±10 μV, maximum), small gain error (±0.01%, maximum) and a high DC CMRR (typical 166 dB). The INA241x is designed for high voltage, bidirectional measurements in switching systems that see large common-mode voltage transients at the device's inputs. The enhanced PWM rejection circuitry inside the INA241x ensures minimal signal disturbance at the output due to the common-mode voltage transitions at the input. The INA241x operates from a single 2.7 V to 20 V supply, drawing 2.5 mA of supply current. The INA241x is available in five gain options: 10 V/V, 20 V/V, 50 V/V, 100 V/V, and 200 V/V. Multiple gain options allow for optimization between available shunt resistor values and wide output dynamic range requirements. The INA241x is specified over operating temperature range of -40°C to +125°C.

Applications

• Motor drives
• Solenoids and actuators
• Injection molding machine
• Cordless power tools
• Medical cordless tools
• Drone propeller speed control

Key features

• Enhanced PWM rejection optimized for systems subject to switching common-mode voltages
• Supports switching frequencies up to 125 kHz
• Wide common-mode voltage:
• Operational voltage: -5 V to +110 V
• Survival voltage: -20 V to +120 V
• Bidirectional operation
• High small signal bandwidth: 1.1 MHz (at all gains)
• Slew rate: 8 V/µs
• Step response settling time to 1%: 1 µs
• Excellent CMRR:
• 166 dB DC-CMRR
• 104 dB AC-CMRR at 100 kHz
• 89 dB AC-CMRR at 1 MHz
• Accuracy:
• Gain error (maximum):
• Version A: ±0.01%, ±1 ppm/°C drift
• Version B: ±0.1%, ±5 ppm/°C drift
• Offset voltage (maximum):
• Version A: ±10 μV, ±0.1 μV/°C drift
• Version B: ±150 μV, ±0.5 μV/°C drift
• Available gains:
• INA241A1, INA241B1: 10 V/V
• INA241A2, INA241B2: 20 V/V
• INA241A3, INA241B3: 50 V/V
• INA241A4, INA241B4: 100 V/V
• INA241A5, INA241B5: 200 V/V
• Package options: SOT23-8, VSSOP-8, SOIC-8, VSSOP-10