Overview
The INA240A2PW, produced by Texas Instruments, is a high-precision, voltage-output current-sense amplifier designed to provide accurate current measurements across a wide range of applications. This device features enhanced pulse width modulation (PWM) rejection, making it ideal for systems that use PWM signals, such as motor drives and solenoid control systems. The INA240A2PW operates over a wide common-mode voltage range from –4 V to 80 V, independent of the supply voltage, and is available in 8-pin TSSOP and 8-pin SOIC packages. It operates from a single 2.7-V to 5.5-V power supply and draws a maximum of 2.4 mA of supply current.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Common-Mode Range | –4 V to 80 V | V |
| DC CMRR | 132 dB | dB |
| AC CMRR at 50 kHz | 93 dB | dB |
| Gain Error | 0.20% | % |
| Gain Drift | 2.5 ppm/°C | ppm/°C |
| Offset Voltage | ±25 μV | μV |
| Offset Drift | 250 nV/°C | nV/°C |
| Available Gains | 20 V/V, 50 V/V, 100 V/V, 200 V/V | V/V |
| Quiescent Current | 2.4 mA | mA |
| Operating Temperature Range | –40°C to +125°C | °C |
| Package Types | 8-pin TSSOP, 8-pin SOIC | |
| Supply Voltage | 2.7 V to 5.5 V | V |
Key Features
- Enhanced PWM Rejection: Reduces the effect of common-mode transients on the output signal associated with PWM signals.
- Excellent CMRR: 132-dB DC CMRR and 93-dB AC CMRR at 50 kHz.
- Wide Common-Mode Range: –4 V to 80 V, independent of the supply voltage.
- High Accuracy: Gain error of 0.20% and offset voltage of ±25 μV.
- Multiple Gain Options: Available gains of 20 V/V, 50 V/V, 100 V/V, and 200 V/V.
- Low Quiescent Current: Maximum of 2.4 mA.
- Extended Operating Temperature Range: –40°C to +125°C.
Applications
- Motor Controls: Suitable for motor drive systems that use PWM signals.
- Solenoid and Valve Controls: Accommodates the flyback period of typical solenoid applications.
- Power Management: Ideal for current sensing in power management systems.
- Actuator Controls: Used in actuator control systems requiring precise current measurement.
- Pressure Regulators: Can be used in pressure regulation systems.
- Telecom Equipment: Suitable for current sensing in telecom equipment.
Q & A
- What is the common-mode voltage range of the INA240A2PW?
The INA240A2PW has a common-mode voltage range of –4 V to 80 V.
- What is the DC CMRR of the INA240A2PW?
The DC CMRR of the INA240A2PW is 132 dB.
- What are the available gain options for the INA240A2PW?
The available gains are 20 V/V, 50 V/V, 100 V/V, and 200 V/V.
- What is the maximum quiescent current of the INA240A2PW?
The maximum quiescent current is 2.4 mA.
- What is the operating temperature range of the INA240A2PW?
The operating temperature range is –40°C to +125°C.
- What are the package types available for the INA240A2PW?
The device is available in 8-pin TSSOP and 8-pin SOIC packages.
- What is the supply voltage range for the INA240A2PW?
The supply voltage range is 2.7 V to 5.5 V.
- What is the purpose of enhanced PWM rejection in the INA240A2PW?
Enhanced PWM rejection reduces the effect of common-mode transients on the output signal associated with PWM signals.
- What are some typical applications of the INA240A2PW?
Typical applications include motor controls, solenoid and valve controls, power management, actuator controls, pressure regulators, and telecom equipment.
- How does the INA240A2PW handle large common-mode transients?
The device is designed to handle large common-mode transients over a wide voltage range, ensuring accurate current measurements without large transients and associated recovery ripple on the output voltage.
