Overview
The Texas Instruments INA122U/2K5 is a precision instrumentation amplifier designed for accurate, low-noise differential signal acquisition. This device is part of the INA122 series, known for its low power consumption and versatility in various applications. The INA122U/2K5 is housed in an SOIC-8 package and is suitable for use in portable instrumentation and data acquisition systems. It features a two-op-amp design, which provides excellent performance with very low quiescent current, making it ideal for battery-powered devices and other power-sensitive applications.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Manufacturer | Texas Instruments | - |
| Part Number | INA122U/2K5 | - |
| Package | SOIC-8 | - |
| Quiescent Current | Typical | 60 μA |
| Power Supply Range | Single Supply | 2.2V to 36V |
| Power Supply Range | Dual Supply | ±18V |
| Offset Voltage | Maximum | 250 μV |
| Offset Drift | Maximum | 3 μV/°C |
| Noise Voltage | At 1 kHz | 60 nV/√Hz |
| Input Bias Current | Maximum | 25 nA |
| Gain Range | 5 V/V to 10000 V/V | |
| Bandwidth | At G = 5 | 100 kHz |
| Common-Mode Rejection Ratio (CMRR) | 83 dB to 96 dB | |
| Operating Temperature | -40°C to 125°C |
Key Features
- Low Power Consumption: The INA122U/2K5 has a typical quiescent current of 60 μA, making it suitable for battery-powered and power-sensitive applications.
- Wide Power Supply Range: It can operate with single or dual power supplies from 2.2V to 36V, providing flexibility in various system designs.
- Rail-to-Rail Output Swing: The output can swing to within approximately 100mV of the power supply rails, depending on load conditions.
- Low Offset Voltage and Drift: Features a maximum offset voltage of 250 μV and an offset drift of 3 μV/°C, ensuring high accuracy.
- Low Noise: Offers a noise voltage of 60 nV/√Hz at 1 kHz, which is crucial for precise signal acquisition.
- High Gain Flexibility: Gain can be set from 5 V/V to 10000 V/V using a single external resistor, RG.
- High Common-Mode Rejection Ratio (CMRR): Provides a CMRR of 83 dB to 96 dB, ensuring effective rejection of common-mode signals.
Applications
- Portable Electronics: Ideal for battery-powered devices due to its low power consumption.
- Field Transmitters and Sensors: Suitable for applications where sensors measure physical parameters such as pressure, temperature, or humidity.
- Pressure Transmitters: Can be used in pressure sensing applications, including resistive-bridge configurations.
- Infusion Pumps: Applicable in medical devices requiring precise signal acquisition and low power consumption.
- Electrocardiograms (ECGs): Used in medical diagnostic equipment for accurate and low-noise signal processing.
Q & A
- What is the typical quiescent current of the INA122U/2K5?
The typical quiescent current is 60 μA.
- What is the power supply range for the INA122U/2K5?
The device can operate with single or dual power supplies from 2.2V to 36V.
- What is the maximum offset voltage of the INA122U/2K5?
The maximum offset voltage is 250 μV.
- How is the gain of the INA122U/2K5 set?
The gain can be set from 5 V/V to 10000 V/V using a single external resistor, RG.
- What is the common-mode rejection ratio (CMRR) of the INA122U/2K5?
The CMRR ranges from 83 dB to 96 dB.
- What are some common applications of the INA122U/2K5?
Common applications include portable electronics, field transmitters and sensors, pressure transmitters, infusion pumps, and electrocardiograms (ECGs).
- What is the bandwidth of the INA122U/2K5 at a gain of 5?
The bandwidth at a gain of 5 is 100 kHz.
- What is the input bias current of the INA122U/2K5?
The maximum input bias current is 25 nA.
- What is the operating temperature range of the INA122U/2K5?
The operating temperature range is -40°C to 125°C.
- What package type is the INA122U/2K5 available in?
The device is available in an SOIC-8 package.
