Overview
The INA128UG4, produced by Texas Instruments, is a precision, low-power instrumentation amplifier. It is part of the INA12x series, which includes the INA128 and INA129 models. These amplifiers are designed for general-purpose use and offer excellent accuracy, making them suitable for a wide range of applications. The INA128UG4 features a versatile three-op-amp design and small size, making it ideal for measurement and test equipment where high accuracy and stability are required.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Offset Voltage | 50 μV (max) | μV |
| Offset Voltage Drift | 0.5 μV/°C (max) | μV/°C |
| Input Bias Current | 5 nA (max) | nA |
| Voltage Noise | 8 nV/√Hz (at 1 kHz) | nV/√Hz |
| Common-Mode Rejection Ratio (CMRR) | 120 dB (min) | dB |
| Bandwidth | 1.3 MHz (at G = 1) | MHz |
| Input Protection | ±40 V | V |
| Supply Voltage Range | ±2.25 V to ±18 V | V |
| Quiescent Current | 700 μA | μA |
| Operating Temperature Range | –40°C to +85°C | °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 at 1 kHz
- High CMRR: 120 dB minimum
- Inputs protected to ±40 V
- Wide supply range: ±2.25 V to ±18 V
- Low quiescent current: 700 μA
- Current-feedback input circuitry for wide bandwidth even at high gain
- Single external resistor sets gain from 1 to 10,000
Applications
- Pressure transmitter
- Temperature transmitter
- Weigh scale
- Electrocardiogram (ECG)
- Analog input module
- Data acquisition (DAQ)
- Bridge amplifier
- Thermocouple amplifier
- RTD sensor amplifier
- Medical instrumentation
Q & A
- What is the maximum offset voltage of the INA128UG4?
The maximum offset voltage is 50 μV.
- What is the input bias current of the INA128UG4?
The input bias current is 5 nA maximum.
- What is the common-mode rejection ratio (CMRR) of the INA128UG4?
The CMRR is 120 dB minimum.
- What is the bandwidth of the INA128UG4 at a gain of 1?
The bandwidth is 1.3 MHz at a gain of 1.
- How is the gain of the INA128UG4 set?
The gain is set by a single external resistor, allowing gains from 1 to 10,000.
- What is the quiescent current of the INA128UG4?
The quiescent current is 700 μA.
- What is the operating temperature range of the INA128UG4?
The operating temperature range is –40°C to +85°C.
- What types of packages are available for the INA128UG4?
The INA128UG4 is available in 8-pin plastic DIP and SO-8 surface-mount packages.
- What kind of input protection does the INA128UG4 have?
The inputs are protected to ±40 V.
- What are some common applications of the INA128UG4?
Common applications include pressure transmitters, temperature transmitters, weigh scales, ECG, analog input modules, and data acquisition systems.
