Overview
The INA138NA/250G4 is a high-side, unipolar current shunt monitor produced by Texas Instruments. This device is part of the INA1x8 family, which includes the INA138 and INA168. It is designed for measuring small differential voltages across a shunt resistor in the presence of large common-mode voltages. The INA138NA/250G4 features a wide input common-mode voltage range, low quiescent current, and high precision, making it ideal for various current sensing applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (V+) | 2.7 | - | 36 | V |
| Input Common-Mode Voltage Range | -0.3 | - | 75 | V |
| Offset Voltage at TA = 25°C | ±0.2 | ±1 | ±2 | mV |
| Offset Voltage Drift | - | - | 1 | µV/°C |
| Input Bias Current at TA = 25°C | - | 2 | 10 | µA |
| Transconductance at VSENSE = 10 mV to 150 mV | 198 | 200 | 202 | µA/V |
| Bandwidth with ROUT = 5 kΩ | - | - | 800 | kHz |
| Quiescent Current at TA = 25°C | 25 | - | 45 | µA |
| Operating Temperature Range | -55 | - | 150 | °C |
Key Features
- High-Side Measurement: Capable of measuring current on the high side of the shunt resistor, allowing for more flexible circuit designs.
- Wide Input Common-Mode Voltage Range: Can handle input voltages from -0.3V to 75V, making it suitable for a variety of applications.
- Low Quiescent Current: Consumes a low quiescent current of 25µA to 45µA at 25°C, which is beneficial for power-sensitive designs.
- High Precision: Offers high precision with low offset voltage and drift, ensuring accurate current measurements.
- Variable Gain: Supports variable gain settings, allowing for flexibility in different application scenarios.
- High Bandwidth: Features a high bandwidth of up to 800kHz, suitable for high-frequency applications.
Applications
- Industrial Automation: Used in current sensing for motor control, power supplies, and other industrial automation equipment.
- Automotive Systems: Applied in automotive systems for battery management, motor control, and other power monitoring applications.
- Power Supplies: Utilized in power supply units for current monitoring and protection.
- Medical Devices: Employed in medical devices requiring precise current measurement and monitoring.
- Aerospace and Defense: Used in various aerospace and defense applications where high precision and reliability are critical.
Q & A
- What is the supply voltage range for the INA138NA/250G4?
The supply voltage range is from 2.7V to 36V.
- What is the input common-mode voltage range for this device?
The input common-mode voltage range is from -0.3V to 75V.
- What is the typical quiescent current of the INA138NA/250G4 at 25°C?
The typical quiescent current is 25µA to 45µA.
- What is the bandwidth of the INA138NA/250G4 with a 5 kΩ load resistor?
The bandwidth is up to 800kHz.
- What are the key applications of the INA138NA/250G4?
Key applications include industrial automation, automotive systems, power supplies, medical devices, and aerospace and defense.
- How does the INA138NA/250G4 handle high common-mode voltages?
The device is designed to handle high common-mode voltages up to 75V, making it suitable for applications with large common-mode voltages.
- What is the offset voltage of the INA138NA/250G4 at 25°C?
The offset voltage is typically ±1mV.
- How does the transconductance of the INA138NA/250G4 vary with temperature?
The transconductance drift is 10 nA/°C over the operating temperature range.
- What is the operating temperature range of the INA138NA/250G4?
The operating temperature range is from -55°C to 150°C.
- Is the INA138NA/250G4 suitable for high-frequency applications?
Yes, it is suitable due to its high bandwidth of up to 800kHz.
