Overview
The INA122UA/2K5G4 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 device 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 INA122 can be set from 5V/V to 10000V/V using a single external resistor (RG).
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Quiescent Current | - | 60 | 85 | μA |
| Power Supply Range | 2.2 | - | 36 | V |
| Offset Voltage | - | - | 250 | μV |
| Offset Drift | - | - | 3 | μV/°C |
| Noise Voltage | - | - | 60 | nV/√Hz |
| Input Bias Current | -10 | - | 25 | nA |
| Common-Mode Rejection Ratio (CMRR) | 76 | - | 96 | dB |
| Bandwidth (-3dB) | - | - | 100 kHz (G=5) | - |
| Slew Rate | - | - | 0.08 V/μs (Rising), 0.12 V/μs (Falling) | - |
| Settling Time (0.01%) | - | - | 350 μs (G=5) | - |
Key Features
- Low quiescent current: 60μA
- Wide power supply range: 2.2V to 36V (single supply) or ±18V (dual supply)
- 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
- Gain adjustable from 5V/V to 10000V/V using a single external resistor (RG)
- Available in 8-pin plastic DIP and SO-8 surface-mount packages
- Extended industrial temperature range: –40°C to +85°C
Applications
- Portable electronics
- Field transmitters and sensors
- Pressure transmitters
- Infusion pumps
- Electrocardiograms (ECGs)
- Resistive-bridge pressure sensors
Q & A
- What is the typical quiescent current of the INA122UA/2K5G4?
The typical quiescent current is 60μA.
- What is the power supply range for the INA122UA/2K5G4?
The device can operate with single power supplies from 2.2V to 36V or dual supplies from ±18V.
- How is the gain of the INA122UA/2K5G4 set?
The gain is set using a single external resistor (RG), allowing gains from 5V/V to 10000V/V.
- What are the package options for the INA122UA/2K5G4?
The device is available in 8-pin plastic DIP and SO-8 surface-mount packages.
- What is the common-mode rejection ratio (CMRR) of the INA122UA/2K5G4?
The CMRR is between 76 dB and 96 dB.
- What is the slew rate of the INA122UA/2K5G4?
The slew rate is 0.08 V/μs (rising) and 0.12 V/μs (falling).
- What is the settling time of the INA122UA/2K5G4?
The settling time is 350 μs for a gain of 5.
- What are some typical applications of the INA122UA/2K5G4?
Typical applications include portable electronics, field transmitters and sensors, pressure transmitters, infusion pumps, and electrocardiograms (ECGs).
- How does the INA122UA/2K5G4 handle noise in the power supply?
The device may require decoupling capacitors close to the device pins to handle noisy or high impedance power supplies.
- What is the temperature range for the INA122UA/2K5G4?
The device is specified for the –40°C to +85°C extended industrial temperature range.
