Overview
The INA128UA/2K5G4 from Texas Instruments is a precision, low-power instrumentation amplifier designed for a wide range of applications requiring high accuracy and low noise. This amplifier is part of the INA12x series, which includes the INA128 and INA129 models. The INA128UA/2K5G4 is particularly noted for its low offset voltage, low drift, and high common-mode rejection ratio (CMRR), making it suitable for use in various precision measurement systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Offset Voltage | 50 | µV (max) |
| Offset Voltage Drift | 0.5 | µV/°C (max) |
| Input Bias Current | 5 | nA (max) |
| Voltage Noise | 8 | nV/√Hz |
| Common-Mode Rejection Ratio (CMRR) | 120 | dB (min) |
| Bandwidth | 1.3 | MHz (G = 1) |
| Input Protection | ±40 | V |
| Supply Voltage Range | ±2.25 to ±18 | V |
| Quiescent Current | 700 | µA |
| Operating Temperature Range | -40 to +85 | °C |
| Package Type | SOIC (D) with 8 pins |
Key Features
- Low offset voltage: 50 µV maximum
- Low drift: 0.5 µV/°C maximum
- Low input bias current: 5 nA maximum
- Low noise: 8 nV/√Hz, 0.2 µVpp
- High CMRR: 120 dB minimum
- Bandwidth: 1.3 MHz at G = 1
- Inputs protected to ±40 V
- Wide supply range: ±2.25 V to ±18 V
- Low quiescent current: 700 µA
- Available in 8-pin plastic DIP and SO-8 surface-mount packages
- Gain adjustable with a single external resistor from 1 to 10,000
Applications
- Pressure transmitters
- Temperature transmitters
- Weigh scales
- Electrocardiogram (ECG) systems
- Analog input modules
- Data acquisition (DAQ) systems
Q & A
- What is the maximum offset voltage of the INA128UA/2K5G4?
The maximum offset voltage is 50 µV.
- What is the input bias current of the INA128UA/2K5G4?
The input bias current is 5 nA maximum.
- What is the common-mode rejection ratio (CMRR) of the INA128UA/2K5G4?
The CMRR is 120 dB minimum.
- What is the bandwidth of the INA128UA/2K5G4 at a gain of 1?
The bandwidth is 1.3 MHz at G = 1.
- How is the gain of the INA128UA/2K5G4 set?
The gain is set by connecting a single external resistor between pins 1 and 8.
- What is the operating temperature range of the INA128UA/2K5G4?
The operating temperature range is -40°C to +85°C.
- What are the package types available for the INA128UA/2K5G4?
The INA128UA/2K5G4 is available in 8-pin plastic DIP and SO-8 surface-mount packages.
- What is the quiescent current of the INA128UA/2K5G4?
The quiescent current is 700 µA.
- What are some typical applications of the INA128UA/2K5G4?
Typical applications include pressure transmitters, temperature transmitters, weigh scales, ECG systems, analog input modules, and data acquisition systems.
- How does the INA128UA/2K5G4 protect its inputs?
The inputs are protected to withstand up to ±40 V without damage.
