Overview
The INA122UA 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, which provides excellent performance with 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. The gain of the INA122UA can be set from 5V/V to 10000V/V using a single external resistor, and it benefits from laser trimming for low offset voltage and excellent common-mode rejection.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (Single Supply) | 2.2 | 36 | V | |
| Supply Voltage (Dual Supply) | ±18 | ±18 | V | |
| Quiescent Current | 60 | 85 | µA | |
| Offset Voltage | 250 | µV | ||
| Offset Drift | 3 | µV/°C | ||
| Noise Voltage | 60 | nV/√Hz | ||
| Input Bias Current | -10 | -25 | nA | |
| Operating Temperature | -40 | 125 | °C | |
| Gain Range | 5 | 10000 | V/V |
Key Features
- Low quiescent current: 60µA
- Wide power supply range: 2.2V to 36V
- Rail-to-rail output swing
- Low offset voltage: 250µV maximum
- Low offset drift: 3µV/°C maximum
- Low noise: 60nV/√Hz
- Low input bias current: 25nA maximum
- Packages: 4.9mm × 6mm SOIC and 9.81mm × 9.43mm PDIP
Applications
- Portable electronics
- Field transmitters and sensors
- Pressure transmitters
- Infusion pumps
- Electrocardiograms (ECGs)
Q & A
- What is the typical quiescent current of the INA122UA? The typical quiescent current is 60µA.
- What is the range of the power supply voltage for the INA122UA? The INA122UA can operate with single or dual power supplies ranging from 2.2V to 36V.
- How is the gain of the INA122UA set? The gain is set using a single external resistor, allowing gains from 5V/V to 10000V/V.
- What are the package options for the INA122UA? The package options include 8-pin plastic DIP and SOIC surface-mount packages.
- What is the operating temperature range of the INA122UA? The operating temperature range is from -40°C to +125°C.
- What are some common applications of the INA122UA? Common applications include portable electronics, field transmitters and sensors, pressure transmitters, infusion pumps, and electrocardiograms (ECGs).
- What is the maximum offset voltage of the INA122UA? The maximum offset voltage is 250µV.
- How does the INA122UA handle common-mode rejection? The INA122UA features excellent common-mode rejection due to its two-op-amp design and laser trimming.
- What is the noise voltage specification of the INA122UA? The noise voltage is 60nV/√Hz.
- What is the input bias current of the INA122UA? The input bias current is -25nA maximum.
