Texas Instruments INA241x Current Sense Amplifiers

Texas Instruments INA241x Current Sense Amplifiers are ultra-precise, bidirectional current sense amplifiers than can measure voltage drops across shunt resistors. This measurement is done over a wide common-mode range from –5V to 110V, independent of the supply voltage.

Analog November 29, 2022 by mixos

Texas Instruments INA241x Current Sense Amplifiers are ultra-precise, bidirectional current sense amplifiers than can measure voltage drops across shunt resistors. This measurement is done over a wide common-mode range from –5V to 110V, independent of the supply voltage. The high-precision current measurement is achieved through a combination of small gain error (±0.01%, maximum), low offset voltage (±10µV, maximum), and a high DC CMRR (typical 166dB). The Texas Instruments 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.

Features

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