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AD629 precision instrumentation amplifier

Creation date: Oct 22, 2023 11:43pm     Last modified date: Oct 22, 2023 11:43pm   Last visit date: Jul 14, 2024 7:17pm
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Oct 22, 2023  ( 1 post )  
Janey Tang (semic)

The AD629 is a precision instrumentation amplifier (in-amp) manufactured by Analog Devices. It is designed for applications where high precision and accuracy in signal amplification and conditioning are required. Here are some key features and details about the AD629:

Key Features:

Instrumentation Amplifier: The AD629 is an instrumentation amplifier, which is a type of operational amplifier (op-amp) configuration optimized for precise amplification of low-level signals.

High Precision: It is known for its high precision and accuracy, making it suitable for applications that demand precise signal processing.

Low Input Offset Voltage and Drift: The AD629 features low input offset voltage and low offset voltage drift over temperature, ensuring minimal errors in signal amplification.

Wide Operating Voltage Range: It can operate with a wide range of power supply voltages, typically between ±2.25V and ±18V, making it versatile in various applications.

High Common-Mode Rejection Ratio (CMRR): The AD629 offers a high CMRR, which means it can effectively reject common-mode noise in differential signal amplification.

Low Noise: The amplifier has low input-referred noise, ensuring that it does not introduce significant noise into the amplified signal.

Programmable Gain: The AD629 typically allows for programmable gain, allowing users to set the amplification factor to match specific application requirements.

Differential or Single-Ended Input: The device can accept both differential and single-ended inputs, offering flexibility in connecting to various sensors and signal sources.


The AD629 is commonly used in a variety of high-precision applications, including:

Bridge Amplification: It is often used to amplify signals from strain gauges and load cells in applications like weighing scales and force measurement.

Sensor Signal Conditioning: The AD629 can condition signals from various sensors, including thermocouples, thermistors, and RTDs.

Precision Instrumentation: It's applied in precision measurement and test equipment for accurate signal conditioning.

Control Systems: Used in control systems and feedback loops where precise amplification and signal conditioning are essential.

Data Acquisition: Employed in data acquisition systems for accurate amplification and conversion of sensor signals.

Medical Instruments: Used in medical devices such as ECG (electrocardiogram) equipment and patient monitoring systems.

Industrial Automation: Applied in industrial automation and process control applications that require accurate signal processing.

Aerospace and Defense: Used in avionics, radar systems, and other mission-critical applications where high precision is crucial.

The AD629 is valued for its performance, reliability, and versatility in applications that require high-precision signal amplification and conditioning. It is a critical component in many systems where accurate measurement and control are paramount.