Overview
The INA240A2DR, produced by Texas Instruments, is a high-precision current-sense amplifier designed for a wide range of applications requiring accurate current measurement. This device features enhanced pulse width modulation (PWM) rejection, making it particularly suitable for systems that use PWM signals, such as motor drives and solenoid control systems. The INA240A2DR operates from a single 2.7-V to 5.5-V power supply and is available in an 8-pin SOIC package. It offers a wide common-mode voltage range from –4 V to 80 V, independent of the supply voltage, and is specified over an extended operating temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range | 2.7 to 5.5 | V |
| Common-Mode Voltage Range | –4 to 80 | V |
| Gain (INA240A2) | 50 | V/V |
| Gain Error | ±0.20% | % |
| Gain Drift | 2.5 | ppm/°C |
| Offset Voltage | ±25 | μV |
| Offset Drift | 250 | nV/°C |
| Quiescent Current | 2.4 | mA |
| Operating Temperature Range | –40 to 125 | °C |
| Bandwidth (–3 dB) | 400 kHz | kHz |
| Common-Mode Rejection Ratio (CMRR) | 132 dB (DC), 93 dB (AC at 50 kHz) | dB |
| Slew Rate | 2 | V/μs |
| Package Type | 8-pin SOIC |
Key Features
- Enhanced PWM Rejection: Reduces the effect of large common-mode transients associated with PWM signals, ensuring accurate current measurements.
- Excellent CMRR: Offers 132 dB DC CMRR and 93 dB AC CMRR at 50 kHz, providing high levels of common-mode rejection.
- Wide Common-Mode Range: Operates over a wide common-mode voltage range from –4 V to 80 V, independent of the supply voltage.
- High Accuracy: Features low gain error (±0.20%), low offset voltage (±25 μV), and low offset drift (250 nV/°C).
- Multiple Gain Options: Available in four fixed gains: 20 V/V, 50 V/V, 100 V/V, and 200 V/V.
- Low Power Consumption: Draws a maximum of 2.4 mA of supply current.
- Extended Operating Temperature Range: Specified over –40°C to +125°C.
Applications
- Motor Controls: Suitable for motor drive systems that use PWM signals.
- Solenoid and Valve Controls: Ideal for solenoid and valve control applications where precise current measurement is critical.
- Power Management: Used in power management systems to monitor and control current flow.
- Actuator Controls: Applicable in actuator control systems requiring accurate current sensing.
- Pressure Regulators: Employed in pressure regulator systems to ensure precise control.
- Telecom Equipment: Used in telecom equipment for supply monitoring and control.
Q & A
- What is the operating voltage range of the INA240A2DR?
The INA240A2DR operates from a single 2.7-V to 5.5-V power supply.
- What is the common-mode voltage range of the INA240A2DR?
The device operates over a wide common-mode voltage range from –4 V to 80 V.
- What are the available gain options for the INA240 series?
The INA240 series is available in four fixed gains: 20 V/V, 50 V/V, 100 V/V, and 200 V/V.
- What is the maximum quiescent current of the INA240A2DR?
The maximum quiescent current is 2.4 mA.
- What is the operating temperature range of the INA240A2DR?
The device is specified over an extended operating temperature range of –40°C to +125°C.
- What is the bandwidth of the INA240A2DR?
The bandwidth is 400 kHz (–3 dB).
- What is the common-mode rejection ratio (CMRR) of the INA240A2DR?
The CMRR is 132 dB (DC) and 93 dB (AC at 50 kHz).
- What are some typical applications of the INA240A2DR?
Typical applications include motor controls, solenoid and valve controls, power management, actuator controls, pressure regulators, and telecom equipment.
- What package types are available for the INA240A2DR?
The device is available in an 8-pin SOIC package.
- How does the INA240A2DR handle PWM signals?
The device features enhanced PWM rejection, which reduces the effect of large common-mode transients associated with PWM signals.
