1. General Introduction

The AD698APZ is a precision linear variable differential transformer (LVDT) signal conditioner manufactured by Analog Devices. LVDTs are widely used in industrial and measurement applications to measure linear displacement accurately. The AD698APZ simplifies the process of converting the LVDT's analog output into a useful and accurate measurement signal.

2. Key Features

2.1 High - Precision Signal Conditioning

The AD698APZ is designed to provide high - precision signal conditioning for LVDTs. It can accurately convert the small, differential AC signals from the LVDT into a DC output voltage that is proportional to the linear displacement of the LVDT core. This high - precision conversion ensures accurate measurement of displacement, which is crucial in applications such as industrial automation, aerospace, and automotive testing.

2.2 Built - in Oscillator

It features a built - in oscillator that provides the excitation signal for the LVDT. The oscillator can generate a stable AC signal with a selectable frequency, typically in the range of 1 kHz to 20 kHz. This eliminates the need for an external oscillator, simplifying the circuit design and reducing the component count.

2.3 Adjustable Gain and Offset

The AD698APZ allows for adjustable gain and offset of the output signal. The gain can be adjusted to scale the output voltage according to the specific requirements of the application, while the offset can be adjusted to zero the output at a particular displacement position. This flexibility makes it suitable for a wide range of LVDT sensors with different sensitivities and measurement ranges.

2.4 High - Input Impedance

The device has a high - input impedance, which means it draws very little current from the LVDT. This is important because it minimizes the loading effect on the LVDT, ensuring that the LVDT can operate accurately and that the measurement results are not affected by the signal conditioner.

2.5 Low - Noise Performance

The AD698APZ offers low - noise performance, which is essential for accurate displacement measurement. Low noise helps to improve the signal - to - noise ratio (SNR) of the output signal, making it easier to detect small changes in displacement and reducing measurement errors.

3. Applications

3.1 Industrial Automation

In industrial automation systems, the AD698APZ can be used to measure the position of mechanical components such as pistons, valves, and slides. It provides accurate displacement measurement, which is used for control and monitoring purposes. For example, in a robotic arm, the AD698APZ can be used to measure the position of the arm joints, allowing for precise control of the arm's movement.

3.2 Aerospace and Defense

In aerospace and defense applications, the AD698APZ can be used in aircraft landing gear systems, missile guidance systems, and other critical applications where accurate displacement measurement is required. The high - precision and reliability of the device make it suitable for use in these demanding environments.

3.3 Automotive Testing

In automotive testing, the AD698APZ can be used to measure the displacement of engine components, suspension systems, and braking systems. It helps to ensure the proper functioning and performance of these components, contributing to the safety and reliability of vehicles.

3.4 Laboratory Instruments

In laboratory instruments, such as material testing machines and coordinate measuring machines (CMMs), the AD698APZ can be used to measure the displacement of test specimens or the position of the measuring probe. It provides accurate and reliable displacement measurement data for research and quality control purposes.

4. Electrical Specifications

4.1 Supply Voltage

The AD698APZ typically operates with a dual - supply voltage, usually in the range of ±5V to ±18V. This dual - supply configuration allows for a wide range of output voltage levels and provides the necessary power for the internal circuitry.

4.2 Output Voltage Range

The output voltage range of the AD698APZ can be adjusted, but it is typically in the range of 0V to 10V or ±5V, depending on the specific application requirements and the gain and offset settings.

4.3 Oscillator Frequency

The built - in oscillator frequency can be adjusted from 1 kHz to 20 kHz. The appropriate frequency can be selected based on the characteristics of the LVDT and the application requirements.

4.4 Operating Temperature Range

The device is designed to operate within a temperature range of - 40°C to 85°C. This wide temperature range ensures its reliable performance in various environmental conditions.

In summary, the AD698APZ is a high - performance LVDT signal conditioner that offers high - precision signal conditioning, built - in oscillator, adjustable gain and offset, and other useful features for a wide range of displacement - measurement applications in different industries.