Overview
The INA149AIDR is a high common-mode voltage difference amplifier produced by Texas Instruments. This precision unity-gain difference amplifier is designed to accurately measure small differential voltages in the presence of high common-mode signals up to ±275 V. It is a single, monolithic device that includes a precision op amp and an integrated thin-film resistor network. The INA149AIDR is particularly useful in applications where high common-mode rejection is required, such as in industrial, automotive, and medical equipment.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Common-Mode Voltage Range | ±275 | V | ||
| Common-Mode Rejection Ratio (CMRR) | 90 | dB (–40°C to +125°C) | ||
| Maximum Offset Voltage | 350 | 1100 | μV | |
| Maximum Offset Voltage Drift | 15 | μV/°C | ||
| Maximum Gain Error | 0.02% | |||
| Differential Input Impedance | 800 | kΩ | ||
| Common-Mode Input Impedance | 200 | kΩ | ||
| Supply Voltage Range | 4 | 5 | V |
Key Features
- High Common-Mode Voltage Range: The INA149AIDR can handle common-mode signals up to ±275 V, making it suitable for applications with high voltage differences.
- High Common-Mode Rejection Ratio (CMRR): With a minimum CMRR of 90 dB from –40°C to +125°C, this amplifier ensures high accuracy in measuring differential signals.
- Precision Op Amp and Resistor Network: The device includes a precision op amp and an integrated thin-film resistor network, ensuring high precision and stability.
- Low Offset Voltage and Drift: The amplifier has a low maximum offset voltage of 1100 μV and a drift of 15 μV/°C, which is crucial for maintaining accuracy over temperature variations.
- Compact Package: Available in an 8-pin SOIC package, making it suitable for a variety of applications where space is limited.
Applications
The INA149AIDR is versatile and can be used in various applications, including:
- Industrial Automation: For measuring differential signals in the presence of high common-mode voltages in industrial control systems.
- Automotive Systems: In automotive sensors and control systems where high voltage differences are common.
- Medical Equipment: For precise measurement of differential signals in medical devices, such as ECG and EEG systems.
- Test and Measurement Equipment: In oscilloscopes, multimeters, and other test equipment requiring high common-mode rejection.
Q & A
- What is the common-mode voltage range of the INA149AIDR?
The INA149AIDR can handle common-mode signals up to ±275 V. - What is the minimum CMRR of the INA149AIDR?
The minimum CMRR is 90 dB from –40°C to +125°C. - What is the maximum offset voltage of the INA149AIDR?
The maximum offset voltage is 1100 μV. - What is the maximum gain error of the INA149AIDR?
The maximum gain error is 0.02%. - What is the typical differential input impedance of the INA149AIDR?
The typical differential input impedance is 800 kΩ. - What is the typical common-mode input impedance of the INA149AIDR?
The typical common-mode input impedance is 200 kΩ. - What is the supply voltage range for the INA149AIDR?
The supply voltage range is from 4 V to 5 V. - In what package is the INA149AIDR available?
The INA149AIDR is available in an 8-pin SOIC package. - What are some common applications of the INA149AIDR?
Common applications include industrial automation, automotive systems, medical equipment, and test and measurement equipment. - How does the INA149AIDR handle high common-mode signals?
The INA149AIDR uses a high precision resistor divider to bring both the positive and negative inputs within the input range of the internal operational amplifier, thus handling high common-mode signals effectively.
