Overview
The INA129UA/2K5, produced by Texas Instruments, is a low-power, general-purpose instrumentation amplifier that offers excellent accuracy and versatility. This amplifier is part of the INA12x series, which includes the INA128 and INA129 models. The INA129UA is particularly noted for its small size and three op-amp design, making it suitable for a wide range of applications. It operates over a temperature range of –40°C to +85°C and is available in 8-pin plastic DIP and SO-8 packages.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Temperature Range | –40 to 125 | °C |
| Supply Voltage (Dual Supply) | ±2.25 to ±18 | V |
| Supply Voltage (Single Supply) | 4.5 to 36 | V |
| Input Common-Mode Voltage Range | (V–) + 2 to (V+) – 2 | V |
| Offset Voltage (RTI) | ±50 | µV |
| Offset Voltage Drift (RTI) | ±0.5 | µV/°C |
| Input Bias Current | ±5 | nA |
| Noise (RTI) | 8 | nV/√Hz |
| Common-Mode Rejection Ratio (CMRR) | 120 | dB |
| Bandwidth (G = 1) | 1.3 | MHz |
| Quiescent Current | 700 | µA |
| Input Protection | ±40 V | V |
| Package Types | 8-pin plastic DIP, SO-8 |
Key Features
- Low Offset Voltage: Maximum of 50 µV.
- Low Drift: Maximum of 0.5 µV/°C.
- Low Input Bias Current: Maximum of 5 nA.
- Low Noise: 8 nV/√Hz, 0.2 µVpp.
- High CMRR: Minimum of 120 dB.
- Wide Bandwidth: 1.3 MHz at G = 1.
- Input Protection: Inputs protected to ±40 V.
- Wide Supply Range: ±2.25 V to ±18 V.
- Low Quiescent Current: 700 µA.
- Gain Flexibility: Single external resistor sets any gain from 1 to 10,000.
Applications
- Pressure Transmitter: For precise pressure measurements.
- Temperature Transmitter: For accurate temperature sensing.
- Weigh Scale: In weight measurement systems.
- Electrocardiogram (ECG): For medical diagnostic equipment.
- Analog Input Module: In data acquisition systems.
- Data Acquisition (DAQ): For various data collection applications.
Q & A
- What is the operating temperature range of the INA129UA?
The operating temperature range is –40°C to +85°C.
- What are the package types available for the INA129UA?
The INA129UA is available in 8-pin plastic DIP and SO-8 packages.
- What is the maximum offset voltage of the INA129UA?
The maximum offset voltage is 50 µV.
- How is the gain set in the INA129UA?
The gain is set using a single external resistor, following the gain equation 1 + (49.4 kΩ / RG).
- What is the common-mode rejection ratio (CMRR) of the INA129UA?
The CMRR is a minimum of 120 dB.
- What is the bandwidth of the INA129UA at a gain of 1?
The bandwidth is 1.3 MHz at a gain of 1.
- What is the quiescent current of the INA129UA?
The quiescent current is 700 µA.
- What is the input protection voltage of the INA129UA?
The inputs are protected to ±40 V.
- What are some common applications of the INA129UA?
Common applications include pressure transmitters, temperature transmitters, weigh scales, ECG equipment, analog input modules, and data acquisition systems.
- What is the noise level of the INA129UA?
The noise level is 8 nV/√Hz, with a peak-to-peak noise of 0.2 µV.
