Overview
The INA129UA/2K5G4, 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 excellent accuracy and are suitable for a wide range of applications due to their versatile three op-amp design and small size. The INA129UA/2K5G4 operates with power supplies as low as ±2.25V and has a quiescent current of only 700µA, making it ideal for battery-operated systems. The device 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 |
|---|---|---|
| Offset Voltage | 50 µV | Maximum |
| Drift | 0.5 µV/°C | Maximum |
| Input Bias Current | 5 nA | Maximum |
| Noise | 8 nV/√Hz, 0.2 µVpp | |
| Common-Mode Rejection Ratio (CMR) | 120 dB | Minimum (G ≥ 100) |
| Bandwidth | 1.3 MHz (G = 1), 200 kHz (G = 100) | |
| Input Protection | ±40 V | |
| Supply Voltage 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 and drift for high accuracy.
- Low input bias current and noise for sensitive signal handling.
- High common-mode rejection ratio (CMR) for effective noise reduction.
- Wide bandwidth even at high gain settings.
- Inputs protected up to ±40 V without damage.
- Wide supply voltage range from ±2.25 V to ±18 V.
- Low quiescent current, ideal for battery-operated systems.
- Available in 8-pin plastic DIP and SO-8 surface-mount packages.
- A single external resistor sets any gain from 1 to 10,000.
Applications
- Pressure transmitters
- Temperature transmitters
- Weigh scales
- Electrocardiogram (ECG) systems
- Analog input modules
- Data acquisition (DAQ) systems
Q & A
- What is the maximum offset voltage of the INA129UA/2K5G4?
The maximum offset voltage is 50 µV.
- What is the input bias current of the INA129UA/2K5G4?
The input bias current is 5 nA maximum.
- What is the common-mode rejection ratio (CMR) of the INA129UA/2K5G4?
The CMR is 120 dB minimum at G ≥ 100.
- What is the bandwidth of the INA129UA/2K5G4 at a gain of 1?
The bandwidth is 1.3 MHz at a gain of 1.
- How is the gain set for the INA129UA/2K5G4?
The gain is set by connecting a single external resistor (RG) between pins 1 and 8, using the equation G = 1 + 49.4kΩ / RG.
- What is the operating temperature range of the INA129UA/2K5G4?
The operating temperature range is –40°C to +85°C.
- What are the available package types for the INA129UA/2K5G4?
The device is available in 8-pin plastic DIP and SO-8 surface-mount packages.
- What is the quiescent current of the INA129UA/2K5G4?
The quiescent current is 700 µA.
- Can the INA129UA/2K5G4 be used in battery-operated systems?
Yes, it is ideal for battery-operated systems due to its low quiescent current.
- What are some common applications of the INA129UA/2K5G4?
Common applications include pressure transmitters, temperature transmitters, weigh scales, ECG systems, analog input modules, and data acquisition systems.
