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INA240

ACTIVE

-4 to 80V, bidirectional, ultra-precise current sense amplifier with enhanced PWM rejection

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Data sheet

INA240

ACTIVE
Data sheet Order now

Product details

Product type Analog output Common-mode voltage (max) (V) 80 Common-mode voltage (min) (V) -4 Input offset (±) (max) (µV) 25 Input offset drift (±) (typ) (µV/°C) 0.05 Voltage gain (V/V) 20, 50, 100, 200 CMRR (min) (dB) 120 Bandwidth (kHz) 400 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 2.6 Number of channels 1 Comparators (#) 0 Gain error (%) 0.2 Gain error drift (±) (max) (ppm/°C) 2.5 Slew rate (V/µs) 2 Features Bidirectional, Enhanced PWM Rejection, Low-side Capable, Ultra precise Rating Catalog Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 80 Common-mode voltage (min) (V) -4 Input offset (±) (max) (µV) 25 Input offset drift (±) (typ) (µV/°C) 0.05 Voltage gain (V/V) 20, 50, 100, 200 CMRR (min) (dB) 120 Bandwidth (kHz) 400 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 2.6 Number of channels 1 Comparators (#) 0 Gain error (%) 0.2 Gain error drift (±) (max) (ppm/°C) 2.5 Slew rate (V/µs) 2 Features Bidirectional, Enhanced PWM Rejection, Low-side Capable, Ultra precise Rating Catalog Operating temperature range (°C) -40 to 125
SOIC (D) 8 29.4 mm² 4.9 x 6 TSSOP (PW) 8 19.2 mm² 3 x 6.4
  • Enhanced PWM Rejection
  • Excellent CMRR:
    • 132-dB DC CMRR
    • 93-dB AC CMRR at 50 kHz
  • Wide Common-Mode Range: –4 V to 80 V
  • Accuracy:
    • Gain:
      • Gain Error: 0.20% (Maximum)
      • Gain Drift: 2.5 ppm/°C (Maximum)
    • Offset:
      • Offset Voltage: ±25 µV (Maximum)
      • Offset Drift: 250 nV/°C (Maximum)
  • Available Gains:
    • INA240A1: 20 V/V
    • INA240A2: 50 V/V
    • INA240A3: 100 V/V
    • INA240A4: 200 V/V
  • Quiescent Current: 2.4 mA (Maximum)
  • Enhanced PWM Rejection
  • Excellent CMRR:
    • 132-dB DC CMRR
    • 93-dB AC CMRR at 50 kHz
  • Wide Common-Mode Range: –4 V to 80 V
  • Accuracy:
    • Gain:
      • Gain Error: 0.20% (Maximum)
      • Gain Drift: 2.5 ppm/°C (Maximum)
    • Offset:
      • Offset Voltage: ±25 µV (Maximum)
      • Offset Drift: 250 nV/°C (Maximum)
  • Available Gains:
    • INA240A1: 20 V/V
    • INA240A2: 50 V/V
    • INA240A3: 100 V/V
    • INA240A4: 200 V/V
  • Quiescent Current: 2.4 mA (Maximum)

The INA240 device 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 and 8-pin SOIC packages.

The INA240 device 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 and 8-pin SOIC packages.
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Technical documentation

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Type Title Date
* Data sheet INA240 –4-V to 80-V, Bidirectional, Ultra-Precise Current Sense Amplifier With Enhanced PWM Rejection datasheet (Rev. C) PDF | HTML 14 Dec 2021
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
Technical article For efficiencies’ sake – how to integrate bidirectional power flow into your UPS design (part 1) PDF | HTML 11 Jan 2024
Application brief Current Sensing Applications in Communication Infrastructure Equipment (Rev. C) PDF | HTML 08 Aug 2023
Application note Using Current Sense Amplifiers at Near-Zero Vsense PDF | HTML 26 Apr 2023
Application brief Current Mode Control in Switching Power Supplies (Rev. E) PDF | HTML 12 Apr 2023
Application brief Current Sensing in an H-Bridge (Rev. D) PDF | HTML 07 Apr 2023
Application brief Low-Drift, Precision, In-Line Motor Current Measurements With PWM Rejection (Rev. D) PDF | HTML 07 Apr 2023
Application brief Switching Power Supply Current Measurements (Rev. E) PDF | HTML 07 Apr 2023
Application brief Precision Current Measurements on High-Voltage Power-Supply Rails (Rev. F) PDF | HTML 17 Oct 2022
Application brief High-Side Drive, High-Side Solenoid Monitor With PWM Rejection (Rev. D) PDF | HTML 15 Aug 2022
Application brief Current Sense Amplifiers in Class-D Audio Subsystems (Rev. A) PDF | HTML 29 Jul 2022
Application note Driving Voltage Reference Pins of Current-Sensing Amplifiers PDF | HTML 29 Jun 2022
E-book An Engineer's Guide to Current Sensing (Rev. B) 12 Apr 2022
Application brief Safety and Protection for Discrete Digital Outputs in a PLC System Using Current (Rev. B) PDF | HTML 10 Mar 2022
Application brief Introduction to Current Sense Amplifiers PDF | HTML 02 Feb 2022
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 2022
Application note Grounding Considerations in Current-Sensing Applications PDF | HTML 14 Dec 2021
Selection guide Current Sense Amplifiers (Rev. E) 20 Sep 2021
Circuit design Circuit to measure multiple redundant source currents with singled-ended signal PDF | HTML 28 Jun 2021
Application note Under the Hood: Output Swing Limitations of Current Sense Amplifiers PDF | HTML 16 Jun 2021
Application brief High-Side Motor Current Monitoring for Over-Current Protection (Rev. B) PDF | HTML 23 Feb 2021
Application brief Difference Between an Instrumentation Amplifier and a Current Sense Amplifier 03 Apr 2020
E-book Ein Techniker-Leitfaden für Industrieroboter-Designs 25 Mar 2020
E-book E-book: An engineer’s guide to industrial robot designs 12 Feb 2020
Technical article How current sensors help monitor and protect the world’s wireless infrastructure PDF | HTML 30 Dec 2019
Technical article Current-sensing dynamics in automotive solenoids PDF | HTML 01 Nov 2019
Circuit design Bidirectional current sensing with a window comparator circuit 16 Sep 2019
Application note Dual-Axis Motor Control Using FCL and SFRA On a Single C2000™ MCU PDF | HTML 07 Aug 2019
Technical article Anything but discrete: How to simplify 48-V to 60-V DC-fed three-phase inverter de PDF | HTML 01 Feb 2019
Technical article Fast Current Loop performance: better than we thought, and measurable in your own PDF | HTML 19 Jun 2018
Circuit design High-side, bidirectional current-sensing circuit with transient protection (Rev. A) PDF | HTML 15 May 2018
Analog Design Journal Second-sourcing options for small-package amplifiers 26 Mar 2018
Application note Dual Motor Ctl Using FCL and Perf Analysis Using SFRA on TMS320F28379D LaunchPad (Rev. A) 20 Mar 2018
Application note Performance Analysis of Fast Current Loop (FCL) in Servo 06 Mar 2018
Application brief Current Sense Amplifiers in Class-D Audio Subsystems 27 Dec 2017
Application brief Low Temperature Drift Integrated Shunt vs Active Temp Compensation of Shunt 27 Dec 2017
Circuit design High-current battery monitor circuit: 0–10A, 0-10kHz, 18 bit 22 Dec 2017
Technical article For efficiencies’ sake – how to integrate bidirectional power flow (part 2) PDF | HTML 19 Sep 2017
Application brief Low-Drift, Low-Side Current Measurements for Three-Phase Systems (Rev. B) 05 Sep 2017
EVM User's guide INA240 EVM User's Guide (Rev. A) 17 Jul 2017
Application brief Benefits of Intergated Low Inductive Shunt for PWM Applications 17 Jun 2017
Technical article A handy tool for power-supply designs PDF | HTML 10 Apr 2017
Application brief Precision LED Brightness and Color Mixing With Discrete Current Sense Amplifiers 28 Feb 2017
Technical article Gallium nitride transistors open up new frontiers in high-speed motor drives PDF | HTML 12 Dec 2016
Technical article Five benefits of enhanced PWM rejection for in-line motor control PDF | HTML 08 Nov 2016
White paper Making factories smarter, more productive through predictive maintenance 02 Nov 2016
Application note Current Sensing for Inline Motor-Control Applications 20 Oct 2016

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