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Data Acquisition - Digital Potentiometers

The AD8403WARZ50-REEL is an adjustable linear-taper digipot with 16 bits of digitally adjustable resolution. It is a solid-state device that functions as both a potentiometer and an analog switch. It is a component of multiple types of solutions, from instrumentation and industrial control to automotive and defense applications.

Overview

The AD8403WARZ50-REEL is a 16-bit DigiPot, or digital potentiometer. It is designed to reduce the size and cost of solutions requiring variable resistance elements, while still retaining the same functional operation as a mechanical potentiometer. The device is operated using a 16-bit control word, which allows for low-voltage adjustment of its wiper position, as well as high-frequency switching of its analog output voltage division ratio.

Functional Description

The AD8403WARZ50-REEL provides a digitally controlled resistor-divider with a linear taper. When two or more of these devices are connected, it creates a topology with various features such as gain, offset, and zero balance. In addition, the device also has low-voltage operation, high frequency response, low power consumption and low resistance linearity.

The device consists of a resistor network that provides a digitally adjustable wiper resistance between one end of the resistor network and the output. The adjustable wiper resistance is controlled with a serial word applied at the device\'s input. The multiplicity of this serial word can be either serial error detection or calibration codes, which are use to reduce adjustment errors.

The output of the device is a voltage that is proportional to the resistance division between the two sides of the resistor ladder. The output voltage is only active if the WEN bit is set. The output is internal to the device, allowing for device-to-device connection with no external connection required. The device can be programmed with the wiper setting and the gains and offsets.

Applications

The AD8403WARZ50-REEL can be used in instrumentation and control applications, industrial automation, automotive control and engine control systems, as well as medical, aerospace and defense applications. It is often used in systems where very remote or small adjustments have to be made and as part of power controllers. Some of the applications that make use of this device include: programmable gain amplifiers, adjustable low-pass filters, adjustable voltage dividers, ADCs and DACs, current limiters, peak detectors, voltage regulators, temperature controllers, motor control systems, and servo control systems.

Limitations

The AD8403WARZ50-REEL is not suitable for some applications because of its limited accuracy and resolution. It has a relatively large temperature coefficient, which means that its linearity will be affected by temperature changes. Additionally, the temperature range should be limited to the range of -40ºC to +85ºC because it is not rated for operation outside of that temperature range.

Conclusion

The AD8403WARZ50-REEL, from Analog Devices, is a 16-bit digitally adjustable linear-taper digipot. It is used in instrumentation and control applications, industrial automation, automotive and defense systems. It has low-voltage operation and low resistance linearity, making it suitable for use in a variety of applications. The device has a limited accuracy and resolution, as well as a relatively large temperature coefficient, but is still a good choice for many applications.

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