Overview
The INA122PA is a precision instrumentation amplifier produced by Texas Instruments. It is designed for accurate, low-noise differential signal acquisition and is particularly suited for portable instrumentation and data acquisition systems. The amplifier features a two-op-amp design, providing excellent performance with a very low quiescent current of 60µA. It can operate with single or dual power supplies ranging from 2.2V to 36V, making it versatile for various applications. A single external resistor can set the gain from 5V/V to 10000V/V, and laser trimming ensures very low offset voltage and drift.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Quiescent Current | 60 | µA |
| Power Supply Range | 2.2V to 36V | V |
| Offset Voltage | 250 | µV |
| Offset Voltage Drift | 3 | µV/°C |
| Noise Voltage | 60 | nV/√Hz |
| Input Bias Current | 25 | nA |
| Common-Mode Rejection Ratio (CMRR) | 83 to 96 | dB |
| Bandwidth (–3dB) | 100 kHz (G = 5), 3.5 kHz (G = 100), 0.9 kHz (G = 500) | kHz |
| Slew Rate | 0.08 V/µs (Rising), 0.12 V/µs (Falling) | V/µs |
| Settling Time | 350 µs (G = 5), 450 µs (G = 100), 1800 µs (G = 500) | µs |
| Operating Temperature Range | –40°C to +85°C | °C |
| Packages | 8-pin PDIP, 8-pin SOIC |
Key Features
- Low quiescent current: 60µA, making it suitable for battery-powered devices.
- Wide power supply range: 2.2V to 36V, allowing for flexibility in system design.
- Rail-to-rail output swing, ensuring maximum output voltage range.
- Low offset voltage: 250µV maximum, and low offset drift: 3µV/°C maximum, ensuring high accuracy.
- Low noise: 60nV/√Hz, which is crucial for precise signal acquisition.
- Low input bias current: 25nA maximum, reducing the impact on the input signal.
- Single external resistor sets gain from 5V/V to 10000V/V, providing high gain flexibility.
Applications
- Portable electronics: Ideal for battery-powered devices due to its low power consumption.
- Field transmitters and sensors: Suitable for remote sensing applications requiring low noise and high accuracy.
- Pressure transmitters: Used in industrial and medical applications where precise pressure measurement is necessary.
- Infusion pumps: Critical in medical devices where accurate and stable signal processing is required.
- Electrocardiograms (ECGs): Used in medical diagnostic equipment for precise heart signal monitoring.
Q & A
- What is the quiescent current of the INA122PA?
The quiescent current of the INA122PA is 60µA.
- What is the power supply range for the INA122PA?
The INA122PA can operate with power supplies ranging from 2.2V to 36V.
- What is the maximum offset voltage of the INA122PA?
The maximum offset voltage of the INA122PA is 250µV.
- How is the gain of the INA122PA set?
The gain of the INA122PA is set by a single external resistor and can range from 5V/V to 10000V/V.
- What is the common-mode rejection ratio (CMRR) of the INA122PA?
The CMRR of the INA122PA is between 83 dB and 96 dB).
- What are the package options for the INA122PA?
The INA122PA is available in 8-pin PDIP and 8-pin SOIC packages).
- What is the operating temperature range of the INA122PA?
The operating temperature range of the INA122PA is –40°C to +85°C).
- What is the slew rate of the INA122PA?
The slew rate of the INA122PA is 0.08 V/µs (Rising) and 0.12 V/µs (Falling)).
- What are some typical applications of the INA122PA?
The INA122PA is typically used in portable electronics, field transmitters and sensors, pressure transmitters, infusion pumps, and electrocardiograms (ECGs)).
- How does the INA122PA handle noise?
The INA122PA has a low noise voltage of 60nV/√Hz, making it suitable for precise signal acquisition).
