Texas Instruments INA241x Current Sense Amplifiers

29 November, 2022

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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

Block Diagram

more information: https://www.ti.com/product/INA241A

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Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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