Overview
The INA240A1DR, produced by Texas Instruments, is a high-performance, bidirectional current-sense amplifier designed for precision current measurement across a wide range of common-mode voltages. This device is part of the INA240 family, which offers enhanced pulse width modulation (PWM) rejection, making it ideal for applications involving motor or solenoid drive and switching power supplies. The INA240A1DR features a zero-drift topology, ensuring high accuracy and minimal output transients, even in the presence of large common-mode transients associated with PWM signals.
Key Specifications
| Parameter | Value |
|---|---|
| Common-Mode Range | -4 V to 80 V |
| Gain | 20 V/V (for INA240A1DR) |
| DC Common-Mode Rejection Ratio (CMRR) | 132 dB |
| AC Common-Mode Rejection Ratio (CMRR) at 50 kHz | 93 dB |
| Input Signal Bandwidth | 400 kHz |
| Package Type | SOIC-8 |
| Supply Voltage Range | Up to 5 V |
| Accuracy | High precision with minimal total error |
Key Features
- Enhanced PWM Rejection: Reduces the effect of common-mode transients on the output signal, particularly useful in applications involving PWM signals.
- High Common-Mode Rejection Ratio (CMRR): 132 dB DC CMRR and 93 dB AC CMRR at 50 kHz, ensuring minimal output transients.
- Wide Common-Mode Range: Operates from -4 V to 80 V, making it suitable for a variety of applications.
- Zero-Drift Topology: Ensures high accuracy and stability over time.
- Bidirectional Operation: Can be configured for either unidirectional or bidirectional output swing.
Applications
The INA240A1DR is widely used in various applications requiring precise current measurement, including:
- Motor and Solenoid Drive: Ideal for monitoring current in motor drive circuits and solenoid applications.
- Switching Power Supplies: Suitable for current sensing in switching power supply systems.
- Automotive Systems: Qualified versions like the INA240-Q1 are available for high-reliability automotive applications.
Q & A
- What is the common-mode range of the INA240A1DR?
The common-mode range of the INA240A1DR is from -4 V to 80 V. - What is the gain of the INA240A1DR?
The gain of the INA240A1DR is 20 V/V. - What is the DC CMRR of the INA240A1DR?
The DC CMRR of the INA240A1DR is 132 dB. - How does the INA240A1DR handle PWM signals?
The INA240A1DR features enhanced PWM rejection, which reduces the effect of common-mode transients associated with PWM signals. - What is the input signal bandwidth of the INA240A1DR?
The input signal bandwidth of the INA240A1DR is 400 kHz. - In what package is the INA240A1DR available?
The INA240A1DR is available in an SOIC-8 package. - What is the supply voltage range for the INA240A1DR?
The supply voltage range for the INA240A1DR is up to 5 V. - Can the INA240A1DR be used for bidirectional current measurement?
Yes, the INA240A1DR can be configured for bidirectional operation. - What are some typical applications of the INA240A1DR?
Typical applications include motor and solenoid drive, switching power supplies, and automotive systems. - Is the INA240A1DR suitable for high-reliability automotive applications?
Yes, qualified versions like the INA240-Q1 are available for high-reliability automotive applications.
