Overview
The INA129PG4, produced by Texas Instruments, is a low-power, general-purpose instrumentation amplifier that offers excellent accuracy and versatility. It is part of the INA12x series, which includes the INA128 and INA129 models. These amplifiers are designed with a three op-amp configuration and feature current-feedback input circuitry, providing wide bandwidth even at high gain settings. The INA129PG4 is available in 8-pin plastic DIP and SO-8 surface-mount packages and is specified for an operating temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Unit | Minimum | Typical | Maximum |
|---|---|---|---|---|
| Offset Voltage, RTI | µV | ±100 | ±150 | ±2050/G |
| Input Bias Current | nA | ±2 | ±5 | ±16 |
| Noise Voltage, RTI | nV/√Hz | 8 | 8 | 8 |
| Common-Mode Rejection Ratio (CMRR) | dB | 120 | 120 | 130 |
| Bandwidth (G = 1) | MHz | 1.3 | 1.3 | 1.3 |
| Input Common-Mode Range | V | (V+) - 1.4 to (V-) + 1.7 | ||
| Safe Input Voltage | V | ±40 | ||
| Supply Voltage Range | V | ±2.25 to ±18 | ||
| Quiescent Current | µA | 700 | 700 | 1200 |
| Operating Temperature Range | °C | -40 to 85 |
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
- Packages: 8-pin plastic DIP, SO-8
- 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 INA129PG4?
The maximum offset voltage is 50 µV.
- How is the gain set on the INA129PG4?
The gain is set by connecting a single external resistor, RG, between pins 1 and 8. The gain equation is 1 + (49.4 kΩ / RG).
- What is the common-mode rejection ratio (CMRR) of the INA129PG4?
The CMRR is a minimum of 120 dB.
- What is the bandwidth of the INA129PG4 at a gain of 1?
The bandwidth at a gain of 1 is 1.3 MHz.
- What is the safe input voltage range for the INA129PG4?
The safe input voltage range is ±40 V.
- What are the available package types for the INA129PG4?
The available packages are 8-pin plastic DIP and SO-8 surface-mount.
- What is the operating temperature range for the INA129PG4?
The operating temperature range is –40°C to +85°C.
- How much quiescent current does the INA129PG4 consume?
The quiescent current is 700 µA.
- What are some typical applications of the INA129PG4?
Typical applications include pressure transmitters, temperature transmitters, weigh scales, ECG systems, analog input modules, and data acquisition systems.
- What is the input bias current of the INA129PG4?
The maximum input bias current is 5 nA.
