ADI AD629

AD629 General Description

The AD629 stands out as a remarkable difference amplifier, designed to meet the demands of precision measurements in environments characterized by high common-mode voltage levels. Its exceptional capabilities empower users to accurately capture differential signals, even when surrounded by substantial common-mode voltages of up to ±270 V.

One of the most compelling features of the AD629 is its ability to serve as a cost-effective alternative to isolation amplifiers in scenarios where galvanic isolation isn't a strict requirement. This flexibility is particularly valuable in applications that demand precision without the added complexity and cost associated with isolation.

The AD629 operates comfortably within a ±270 V common-mode voltage range, showcasing its adaptability to diverse voltage conditions. Furthermore, its inputs are safeguarded against common-mode or differential mode transients, ensuring reliable operation even in the presence of voltage spikes of up to ±500 V.

This amplifier isn't just versatile in voltage handling; it also boasts an array of desirable characteristics. It exhibits low offset voltage, minimal offset drift over time, low gain error drift, and a remarkable common-mode rejection ratio (CMRR) that remains consistent across a wide frequency spectrum. These attributes make the AD629 a dependable choice for applications where precision and stability are paramount.

The AD629 is offered in both die and packaged forms, with convenient 8-lead PDIP (Plastic Dual In-Line Package) and 8-lead SOIC (Small Outline Integrated Circuit) packages available. Regardless of the chosen package type or grade, the AD629's performance is guaranteed to meet stringent specifications across the industrial temperature range, spanning from -40°C to +85°C.

AD629 difference amplifier redefines precision in challenging electrical environments, offering versatility, stability, and robustness for a wide array of applications, all while simplifying designs and reducing costs when galvanic isolation isn't a prerequisite.

Specifications

Functional block diagram

Features

The AD629 is a high-performance difference amplifier equipped with a comprehensive set of features that make it a valuable choice for precision signal processing. 

• Improved Replacement: The AD629 serves as an improved replacement for the INA117P and INA117KU amplifiers, offering enhanced performance and functionality.
• Wide Common-Mode Voltage Range: It boasts an impressive common-mode voltage range of ±270 V, allowing for the precise measurement of differential signals even in the presence of extremely high common-mode voltages.
• Robust Input Protection: The AD629 is designed with robust input protection, safeguarding against common-mode voltages of up to ±500 V and differential mode transients of ±500 V, ensuring the safety and reliability of the device.
• Wide Power Supply Range: The amplifier operates over a wide power supply voltage range, spanning from ±2.5 V to ±18 V, providing flexibility in various voltage conditions.
• Output Swing: It can achieve a ±10 V output swing when powered with a ±12 V supply, allowing for a wide dynamic range of signal output.
• Low Power Consumption: With a maximum power supply current of 1 mA, the AD629 is energy-efficient, making it suitable for power-conscious applications.
• High Accuracy DC Performance: The AD629 excels in delivering high accuracy DC performance with the following specifications:

Maximum gain nonlinearity of 3 ppm (AD629B)
Maximum offset drift of 20 μV/°C (AD629A) and 10 μV/°C (AD629B)
Maximum gain drift of 10 ppm/°C
Excellent AC Specifications: The amplifier offers impressive AC specifications, including:

• Minimum CMRR (Common-Mode Rejection Ratio) of 77 dB @ 500 Hz (AD629A) and 86 dB @ 500 Hz (AD629B)
  A bandwidth of 500 kHz, allowing it to handle high-frequency signals with ease.

Pin configuration

Equivalent Parts

Application

AD629's versatility and exceptional performance characteristics make it a valuable component in applications that demand precision signal processing and measurement, particularly in situations involving high common-mode voltages and challenging electrical environments.

High Voltage Current Sensing: The AD629 is well-suited for high voltage current sensing applications where accurate measurement of current is required in the presence of high common-mode voltages. This is particularly valuable in power electronics, industrial equipment, and energy management systems.

Battery Cell Voltage Monitors: In battery-powered devices and systems, monitoring individual battery cell voltages is critical for battery management and ensuring safe and efficient operation. The AD629's ability to handle high common-mode voltages makes it an ideal choice for battery cell voltage monitoring applications.

Power Supply Current Monitors: Precise monitoring of power supply currents is essential in various electronic systems to optimize power usage and ensure reliable operation. The AD629's high accuracy and wide common-mode voltage range make it suitable for power supply current monitoring.

Motor Controls: In motor control applications, accurate measurement of current and voltage is crucial for efficient and safe operation. The AD629 can be employed in motor control circuits to monitor current and voltage, enabling precise control and protection features.

Isolation: While the AD629 is not an isolation amplifier, its ability to operate with high common-mode voltages can be valuable in applications that require signal conditioning before isolation. It can be used in conjunction with isolation components to ensure accurate data transmission and safety in electrically noisy environments.

Industrial Automation: The AD629's robust performance and ability to handle high common-mode voltages make it a valuable asset in industrial automation systems. It can be used for precise data acquisition and control in manufacturing and process automation.

Instrumentation: Precision measurement and instrumentation applications benefit from the AD629's high accuracy and wide voltage range. It can be employed in data acquisition systems, test and measurement equipment, and other instrumentation solutions.

Energy Management: In energy management systems, the AD629 can play a crucial role in monitoring current and voltage in power distribution and renewable energy applications, helping optimize energy usage and ensure system reliability.

Absolute maximum ratings

Manufacturer

Analog Devices, Inc. (ADI) stands as a global leader in the semiconductor industry, renowned for its commitment to delivering high-performance analog, mixed-signal, and digital signal processing (DSP) integrated circuits (ICs) that power a wide spectrum of applications.

Analog Devices, Inc. was founded in the year 1965, marking the beginning of a journey characterized by innovation, quality, and technological advancement. With a legacy spanning decades, ADI has contributed significantly to shaping the modern electronics landscape. The company is headquartered in Norwood, Massachusetts, a hub of technological innovation and development. From this strategic location, ADI manages its global operations, research, and customer engagement.

As a leader in the analog and mixed-signal IC industry, ADI drives technological progress and provides innovative solutions to some of the world's most complex challenges. Their expertise and commitment to excellence have solidified their position as a trusted partner across industries.

Dimensions

Lead Plastic Dual In-Line Package [PDIP]
(N-8)
Dimensions shown in inches and (millimeters)

Lead Standard Small Outline Package [SOIC_N]
(R-8)
Dimensions shown in millimeters and (inches) 

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Specifications