AD5170BRM100-RL7

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Data Acquisition – Digital Potentiometers

Digital Potentiometers are widely used in data acquisition, with applications ranging from voltage adjustment to variable gain control. The AD5170BRM100-RL7 from Analog Devices is a popular digital potentiometer with a wide operating range, durability, accuracy, and very low power consumption. This article will discuss the application and working principle of the AD5170BRM100-RL7 as a digital potentiometer.

Application

The AD5170BRM100-RL7 is a single-channel, constant-current source digital potentiometer that is capable of producing electrical signals across a wide range of resistance values, from 1KΩ to 1MΩ. Its single-channel design makes it suitable for applications involving voltage adjustment, data acquisition and gain control. Its 1MΩ resistance range is ideal for linear control of power consumption in applications such as adjustable lighting, haptic feedback and touch sensors. The device is also ESD-hardened, making it suitable for applications with harsh environmental conditions.

Working Principle

The AD5170BRM100-RL7 is driven by a byte-wide serial interface. This allows for finer control of the resistance output, which is numeric and represented as a binary code. The device has an integrated digital-to-analog converter that allows the user to select a segment of the resistance range with a resolution of 8 bits (1/256th of the full range). The resolution can be increased to 10 bits (1/1024th of the full range) by using the device’s on-chip digital to analog converter. The device also has an integrated error correction that provides better results when adjusting resistance in terms of current accuracy. The device is powered by a 5V supply and draws very low active power of only 60µW, increasing the system’s efficiency.

Conclusion

The AD5170BRM100-RL7 has a wide operating range of up to 1MΩ and can be used in many data acquisition applications, including voltage adjustment, data acquisition, and gain control. The device has an integrated 10-bit resolution D/A converter, allowing for precise control of the resistance output. The device is powered by a single 5V supply, making it suitable for battery-operated applications. It is also ESD-hardened and draws very low active power.

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