Overview
The INA128U, produced by Texas Instruments, is a precision, low-power instrumentation amplifier designed for high accuracy and versatility. It features a three op-amp design and is suitable for a wide range of applications due to its small size and robust performance characteristics. The amplifier offers low offset voltage, low drift, and high common-mode rejection ratio (CMRR), making it ideal for applications requiring precise signal amplification.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Offset Voltage, RTI | ±50 | µV |
| Offset Voltage Drift | ±0.5 | µV/°C |
| Input Bias Current | ±5 | nA |
| Noise | 8 nV/√Hz, 0.2 µVpp | |
| Common-Mode Rejection Ratio (CMRR) | 120 dB (min) | |
| Bandwidth | 1.3 MHz (G = 1) | |
| Input Protection | ±40 V | |
| Supply Range | ±2.25 V to ±18 V | |
| Quiescent Current | 700 µA | |
| Operating Temperature Range | –40°C to +85°C | |
| Package Types | 8-pin plastic DIP, SO-8 |
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 (G = 1)
- Inputs protected to ±40 V
- Wide supply range: ±2.25 V to ±18 V
- Low quiescent current: 700 µA
- Packages: 8-pin plastic DIP, SO-8
- Current-feedback input circuitry for wide bandwidth even at high gain
- A single external resistor sets any gain from 1 to 10,000
Applications
- Bridge amplifier
- Thermocouple amplifier
- RTD sensor amplifier
- Medical instrumentation
- Data acquisition
Q & A
- What is the maximum offset voltage of the INA128U?
The maximum offset voltage of the INA128U is 50 µV.
- What is the input bias current of the INA128U?
The input bias current of the INA128U is 5 nA maximum.
- What is the bandwidth of the INA128U at a gain of 1?
The bandwidth of the INA128U at a gain of 1 is 1.3 MHz.
- What is the common-mode rejection ratio (CMRR) of the INA128U?
The CMRR of the INA128U is 120 dB minimum.
- What is the quiescent current of the INA128U?
The quiescent current of the INA128U is 700 µA.
- What are the package types available for the INA128U?
The INA128U is available in 8-pin plastic DIP and SO-8 surface-mount packages.
- What is the operating temperature range of the INA128U?
The operating temperature range of the INA128U is –40°C to +85°C.
- How is the gain of the INA128U set?
The gain of the INA128U can be set using a single external resistor, allowing gains from 1 to 10,000.
- What are some common applications of the INA128U?
The INA128U is commonly used in bridge amplifiers, thermocouple amplifiers, RTD sensor amplifiers, medical instrumentation, and data acquisition systems.
- Does the INA128U have input protection?
