Overview
The INA128UA/2K5E4 is a precision, low-power instrumentation amplifier produced by Texas Instruments. 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 INA128UA features a versatile three op-amp design and is available in 8-pin plastic DIP and SO-8 surface-mount packages, specified for the –40°C to +85°C temperature range.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Temperature Range | –40 to 125 | °C |
| Supply Voltage | ±2.25 V to ±18 V | V |
| Offset Voltage | 50 µV, maximum | µV |
| Offset Voltage Drift | 0.5 µV/°C, maximum | µV/°C |
| Input Bias Current | 5 nA, maximum | nA |
| Noise | 8 nV/√Hz, 0.2 µVpp | nV/√Hz, µVpp |
| Common-Mode Rejection Ratio (CMR) | 120 dB, minimum | dB |
| Bandwidth | 1.3 MHz (G = 1) | MHz |
| Input Protection | ±40 V | V |
| Quiescent Current | 700 µA | µA |
| Package | 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 CMR: 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
- Single external resistor sets any gain from 1 to 10,000
Applications
- Pressure transmitter
- Temperature transmitter
- Weigh scale
- Electrocardiogram (ECG)
- Medical instrumentation
- Data acquisition (DAQ)
- Bridge amplifier
- Thermocouple amplifier
- RTD sensor amplifier
- Analog input module
Q & A
- What is the operating temperature range of the INA128UA?
The operating temperature range is –40°C to 125°C.
- What is the maximum offset voltage of the INA128UA?
The maximum offset voltage is 50 µV.
- How is the gain set for the INA128UA?
The gain is set by connecting a single external resistor between pins 1 and 8. The gain equation for the INA128 is G = 1 + (50 kΩ / RG).
- What is the common-mode rejection ratio (CMR) of the INA128UA?
The CMR is 120 dB, minimum.
- What is the bandwidth of the INA128UA at a gain of 1?
The bandwidth is 1.3 MHz at a gain of 1.
- What is the input protection voltage for the INA128UA?
The inputs are protected to ±40 V.
- What is the quiescent current of the INA128UA?
The quiescent current is 700 µA.
- In what packages is the INA128UA available?
The INA128UA is available in 8-pin plastic DIP and SO-8 surface-mount packages.
- What are some common applications of the INA128UA?
Common applications include pressure transmitters, temperature transmitters, weigh scales, ECG, medical instrumentation, data acquisition, bridge amplifiers, thermocouple amplifiers, and RTD sensor amplifiers.
- What is the supply voltage range for the INA128UA?
The supply voltage range is ±2.25 V to ±18 V.
