Overview
The INA129PA, produced by Texas Instruments, is a low-power, general-purpose instrumentation amplifier. It features a versatile three op-amp design, making it an excellent choice for a wide range of applications. The amplifier offers excellent accuracy, low offset voltage, and high common-mode rejection. It is available in 8-pin plastic DIP and SO-8 surface-mount packages, with an operating temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Offset Voltage, RTI | ±50 | µV | Maximum |
| Input Bias Current | 5 | nA | Maximum |
| Input Noise Voltage | 8 | nV/√Hz | |
| Common-Mode Rejection Ratio (CMRR) | 120 dB | Minimum at G ≥ 1 | |
| Bandwidth | 1.3 MHz | At G = 1 | |
| Supply Voltage Range | ±2.25 V to ±18 V | ||
| Quiescent Current | 700 µA | Typical | |
| Input Protection | ±40 V | ||
| Gain Range | 1 to 10,000 | Set by external resistor | |
| Operating Temperature Range | –40°C to +85°C |
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
- Wide 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 typical
- Single external resistor sets gain from 1 to 10,000
Applications
- Bridge Amplifier
- Thermocouple Amplifier
- RTD Sensor Amplifier
- Medical Instrumentation
- Data Acquisition
- Extreme Temperature Applications
Q & A
- What is the maximum offset voltage of the INA129PA?
The maximum offset voltage of the INA129PA is 50 µV.
- What is the input bias current of the INA129PA?
The input bias current of the INA129PA is 5 nA maximum.
- What is the common-mode rejection ratio (CMRR) of the INA129PA?
The CMRR of the INA129PA is 120 dB minimum at G ≥ 1.
- What is the bandwidth of the INA129PA at a gain of 1?
The bandwidth of the INA129PA at a gain of 1 is 1.3 MHz.
- What is the supply voltage range for the INA129PA?
The supply voltage range for the INA129PA is ±2.25 V to ±18 V.
- How is the gain of the INA129PA set?
The gain of the INA129PA is set by a single external resistor, allowing gains from 1 to 10,000.
- What is the operating temperature range of the INA129PA?
The operating temperature range of the INA129PA is –40°C to +85°C.
- What kind of input protection does the INA129PA have?
The INA129PA has input protection that can withstand up to ±40 V without damage.
- What are some common applications of the INA129PA?
The INA129PA is commonly used in bridge amplifiers, thermocouple amplifiers, RTD sensor amplifiers, medical instrumentation, data acquisition, and extreme temperature applications.
- What package types are available for the INA129PA?
The INA129PA is available in 8-pin plastic DIP and SO-8 surface-mount packages).
