INA240

SOIC (D)

19 mm² 4.9 x 3.9

TSSOP (PW)

19 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.

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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)	14 Dec 2021
	Application note	Grounding Considerations in Current-Sensing Applications	14 Dec 2021
	Application note	Low-Drift, Precision, In-Line Motor Current Measurements With PWM Rejection (Rev. C)	28 Sep 2021
	Selection guide	Current Sense Amplifiers (Rev. E)	20 Sep 2021
	Application note	Circuit to measure multiple redundant source currents with singled-ended signal	28 Jun 2021
	Application note	Under the Hood: Output Swing Limitations of Current Sense Amplifiers	16 Jun 2021
	Technical article	Solving the multidecade current-measurement challenge in your 48-V BMS application	14 Jun 2021
	Application note	High-Side Motor Current Monitoring for Over-Current Protection (Rev. B)	23 Feb 2021
	Technical article	How current-sense amplifiers monitor satellite health	08 Feb 2021
	Application note	Current Sensing in an H-Bridge (Rev. B)	05 Feb 2021
	Application note	Current Measurements in Power Supplies (Rev. B)	29 Dec 2020
	Application note	Current Mode Control in Switching Power Supplies (Rev. B)	29 Dec 2020
	Application note	Current Sensing Applications in Communication Infrastructure Equipment (Rev. A)	29 Dec 2020
	Application note	Precision Current Measurements on High-Voltage Power-Supply Rails (Rev. D)	29 Dec 2020
	Application note	Current Sensing in a Programmable Logic Controller (PLC) (Rev. A)	04 Dec 2020
	Application note	High-Side Drive, High-Side Solenoid Monitor With PWM Rejection (Rev. C)	04 Dec 2020
	Application note	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
	E-book	Simplifying Current Sensing (Rev. A)	09 Jan 2020
	Technical article	How current sensors help monitor and protect the world’s wireless infrastructure	30 Dec 2019
	Technical article	Current-sensing dynamics in automotive solenoids	01 Nov 2019
	Application note	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	07 Aug 2019
	Application note	High-side, bidirectional current-sensing circuit with transient protection (Rev. A)	19 Feb 2019
	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 note	Current Sense Amplifiers in Class-D Audio Subsystems	27 Dec 2017
	Application note	Low Temperature Drift Integrated Shunt vs Active Temp Compensation of Shunt	27 Dec 2017
	Application note	High-current battery monitor circuit: 0–10A, 0-10kHz, 18 bit	22 Dec 2017
	Application note	Low-Drift, Low-Side Current Measurements for Three-Phase Systems (Rev. B)	05 Sep 2017
	User guide	INA240 EVM User's Guide (Rev. A)	17 Jul 2017
	Application note	Benefits of Intergated Low Inductive Shunt for PWM Applications	17 Jun 2017
	Application note	Precision LED Brightness and Color Mixing With Discrete Current Sense Amplifiers	28 Feb 2017
	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

Design & development

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Evaluation board

INA240EVM — High or Low Side Current Sensing Amplifier for PWM Applications Evaluation Module

Evaluate the performance of the INA240 current sense amplifier with the INA240 evaluation module. The INA240EVM package includes one large PCB that can be broken apart into four separate PCBs, one for each of the four gain versions (INA240A1/A2/A3/A4).

The EVM includes test points for external (...)

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Evaluation board

PSEMTHR24EVM-081 — Mother board for 24-port IEEE 802.3bt ready PSE system

PSEMTHR24EVM-081 is the base board for the TPS23881 and TPS23882 PSE controllers. This board contains 24 2-Pair / 4-Pair ports that can that can be used to send up to 30W/port for IEEE 802.3at applications and up to 90W/port for IEEE 802.3bt applications.

Daughter card

BOOSTXL-3PHGANINV — 48-V Three-Phase Inverter With Shunt-Based In-Line Motor Phase Current Sensing Evaluation Module

The BOOSTXL-3PHGANINV evaluation module features a 48-V/10-A three-phase GaN inverter with precision in-line shunt-based phase current sensing for accurate control of precision drives such as servo drives.

MathWorks MATLAB & Simulink example models include the following:

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User guide

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TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)

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Calculation tool

Current Sense Amplifier Comparison and Error Tool (Rev. D)

SBOR020D.ZIP (582 KB)

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Design tool

CIRCUIT060030 — High-side, bidirectional current-sensing circuit with transient protection

This high-side, bidirectional current sensing solution can accurately measure current in the range of –40 A to 40 A for a 36-V voltage bus. The linear voltage output is 100 mV to 4.90 V. This solution is also designed to survive IEC61000-4-4 level 4 EFT stress (Voc = 2 kV; Isc = 40 A; 8/20 (...)

Design tool

CIRCUIT060035 — Bidirectional current sensing with a window comparator circuit

This bidirectional current sensing solution uses a current-sense amplifier and a high-speed dual comparator with a rail-to-rail input common mode range to create over-current (OC) alert signals at the comparator outputs (OUTA and OUTB) if the input current (IG1) rises above 100 A or falls below (...)

Design tool

CIRCUIT060037 — Precision over-current latch circuit

This high-side, current sensing solution uses a current sense amplifier, a comparator with an integrated reference and a P-channel MOSFET to create an over-current latch circuit. When a load current greater than 200 mA is detected, the circuit disconnects the system from its power source. The (...)