Overview
The INA129P, produced by Texas Instruments, is a low-power, general-purpose instrumentation amplifier. It is part of the INA12x series, known for its excellent accuracy and versatility. The amplifier features a three-op-amp design and current-feedback input circuitry, which provides wide bandwidth even at high gain settings. This makes it an excellent choice for a wide range of applications, including those requiring high precision and low power consumption. The INA129P operates with power supplies as low as ±2.25 V and has a quiescent current of 700 µA, making it ideal for battery-operated systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Offset Voltage | 50 µV (max) | µV |
| Drift | 0.5 µV/°C (max) | µV/°C |
| Input Bias Current | 5 nA (max) | nA |
| Noise Voltage | 8 nV/√Hz, 0.2 µVpp | nV/√Hz, µVpp |
| Common Mode Rejection Ratio (CMRR) | 120 dB (min) at G ≥ 100 | dB |
| Bandwidth | 1.3 MHz (G = 1) | MHz |
| Input Protection | ±40 V | V |
| Supply Range | ±2.25 V to ±18 V | V |
| Quiescent Current | 700 µA | µA |
| Operating Temperature Range | –40°C to +85°C | °C |
| Packages | 8-pin plastic DIP, SO-8 |
Key Features
- Low Offset Voltage and Drift: Maximum offset voltage of 50 µV and drift of 0.5 µV/°C, ensuring high accuracy.
- Low Input Bias Current and Noise: Maximum input bias current of 5 nA and noise voltage of 8 nV/√Hz, 0.2 µVpp.
- High CMRR: Minimum CMRR of 120 dB at G ≥ 100, providing excellent common-mode rejection.
- Wide Bandwidth: Bandwidth of 1.3 MHz at G = 1, suitable for high-frequency applications.
- Input Protection: Inputs protected up to ±40 V without damage.
- Flexible Gain Setting: Gain can be set from 1 to 10,000 using a single external resistor.
- Low Power Consumption: Quiescent current of 700 µA, ideal for battery-operated systems.[
Applications
- Bridge Amplifier: Suitable for strain gauge and bridge transducer applications.
- Thermocouple Amplifier: Ideal for thermocouple-based temperature measurement systems.
- RTD Sensor Amplifier: Used in resistance temperature detector (RTD) sensor applications.
- Medical Instrumentation: Applied in various medical devices requiring high precision and low noise.
- Data Acquisition: Utilized in data acquisition systems for precise signal amplification.
- Pressure and Temperature Transmitters: Used in industrial transmitters for pressure and temperature measurements.
Q & A
- What is the maximum offset voltage of the INA129P?
The maximum offset voltage of the INA129P is 50 µV.
- What is the drift specification of the INA129P?
The drift specification of the INA129P is 0.5 µV/°C (max).
- What is the input bias current of the INA129P?
The maximum input bias current of the INA129P is 5 nA.
- What is the bandwidth of the INA129P at a gain of 1?
The bandwidth of the INA129P at a gain of 1 is 1.3 MHz.
- How is the gain of the INA129P set?
The gain of the INA129P is set using a single external resistor connected between pins 1 and 8.
- What is the common-mode rejection ratio (CMRR) of the INA129P?
The minimum CMRR of the INA129P is 120 dB at G ≥ 100.
- What is the operating temperature range of the INA129P?
The operating temperature range of the INA129P is –40°C to +85°C.[
- What are the available packages for the INA129P?
The INA129P is available in 8-pin plastic DIP and SO-8 packages.[
- What is the quiescent current of the INA129P?
The quiescent current of the INA129P is 700 µA.[
- What are some typical applications of the INA129P?
The INA129P is typically used in bridge amplifiers, thermocouple amplifiers, RTD sensor amplifiers, medical instrumentation, and data acquisition systems.[
