Overview
The INA240A1D is a high-accuracy, bidirectional, current-sensing amplifier manufactured by Texas Instruments. This device is designed for precision current measurement applications, offering a wide common-mode voltage range of -4 V to 80 V, making it suitable for various power management systems. The INA240A1D features enhanced pulse width modulation (PWM) rejection, which reduces the effect of common-mode transients on the output signal, ensuring accurate current measurements in systems using PWM signals.
The amplifier operates from a single 2.7-V to 5.5-V power supply and draws a maximum of 2.4 mA of supply current. It is available in multiple fixed gain versions: 20 V/V, 50 V/V, 100 V/V, and 200 V/V. The zero-drift architecture of the INA240A1D enables precise current sensing with low offset voltage and drift, making it ideal for applications requiring high accuracy over temperature and voltage variations.
Key Specifications
| Parameter | Value |
|---|---|
| Common-Mode Voltage Range | -4 V to 80 V |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Quiescent Current (Maximum) | 2.4 mA |
| Gain Options | 20 V/V, 50 V/V, 100 V/V, 200 V/V |
| Gain Error (Maximum) | 0.20% |
| Gain Drift (Maximum) | 2.5 ppm/°C |
| Offset Voltage (Maximum) | ±25 μV |
| Offset Drift (Maximum) | 250 nV/°C |
| Common-Mode Rejection Ratio (CMRR) | 132 dB (DC), 93 dB (AC at 50 kHz) |
| Bandwidth | 400 kHz |
| Slew Rate | 2 V/μs |
| Operating Temperature Range | -40°C to 125°C |
| Package | 8-pin SOIC |
Key Features
- High-Accuracy Current Sensing: Provides precise current sensing with low offset voltage and high gain accuracy.
- Bidirectional Operation: Allows for current flow in both directions, making it suitable for applications requiring bi-directional current monitoring.
- Wide Input Voltage Range: Operates over a wide input voltage range of -4 V to 80 V, ensuring reliable performance in various power management systems.
- Enhanced PWM Rejection: Reduces the effect of common-mode transients on the output signal, ensuring accurate current measurements in PWM-based systems.
- Low Power Consumption: Consumes low power, making it suitable for battery-powered or energy-efficient applications.
- Zero-Drift Architecture: Ensures superior accuracy over voltage and temperature variations.
- Shutdown Mode: Includes a shutdown pin for power-saving functionality.
Applications
- Power Management Systems: Suitable for industrial and automotive power management applications.
- Battery Management Systems: Ideal for precise current monitoring in battery-powered devices and energy-efficient systems.
- Motor Control Systems: Used in motor control and drive systems where accurate current sensing is critical.
- Consumer Electronics and Appliances: Suitable for various consumer electronics and appliances requiring precise current monitoring.
- Solenoid and Valve Controls: Used in applications requiring precise control over solenoids and valves.
- Telecom Equipment: Used in telecom equipment for supply and power management.
Q & A
- What is the INA240A1D?
The INA240A1D is a high-accuracy, bidirectional, current-sensing amplifier from Texas Instruments, designed for precision current measurement applications.
- How does the INA240A1D work?
The INA240A1D operates by amplifying the voltage across a shunt resistor in a current measurement circuit, providing a proportional output current signal.
- What are the key features of the INA240A1D?
Key features include high-accuracy current sensing, bidirectional operation, wide input voltage range, enhanced PWM rejection, and low power consumption.
- What are the available gain options for the INA240A1D?
The INA240A1D is available in multiple fixed gain versions: 20 V/V, 50 V/V, 100 V/V, and 200 V/V.
- What is the common-mode voltage range of the INA240A1D?
The common-mode voltage range is -4 V to 80 V.
- What is the operating temperature range of the INA240A1D?
The operating temperature range is -40°C to 125°C.
- What package types are available for the INA240A1D?
The INA240A1D is available in an 8-pin SOIC package.
- What are some typical applications of the INA240A1D?
Typical applications include power management systems, battery management systems, motor control systems, and consumer electronics.
- Does the INA240A1D have a shutdown mode?
Yes, the INA240A1D includes a shutdown pin for power-saving functionality.
- What are some alternatives to the INA240A1D?
Alternatives include the INA219 from Texas Instruments, the MAX4080 from Maxim Integrated, and the LT6106 from Analog Devices.
