AD7890AR-4

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Data acquisition is an important task in systems design, especially in applications that require precision measurements. The choice of device and data converter will affect the quality of the acquired data, and hence the quality of the system results. The Analog Devices AD7890AR-4 is a special purpose data acquisition device that can provide precision measurements for a variety of applications. This article will discuss the application field and working principle of the AD7890AR-4.

Application Field of AD7890AR-4

The Analog Devices AD7890AR-4 is a precision mixed signal front-end device for 16-bit delta-sigma measurements, with an analog-to-digital conversion resolution of up to 20 bits. This device is suitable for a wide range of applications, such as industrial and Automotive automation, medical and life sciences, audio and video electronics, data acquisition, and laboratory test and measurement systems. It is also compatible with existing signal acquisition and signal conditioning systems, and can be used in conjunction with a wide variety of analog signal sources and signal conditioning circuits.

The main features and benefits of the AD7890AR-4 include:

• Ideal for low power and Industrial Automation applications
• Dual 16-bit delta-sigma type A/D inputs
• High precision: up to +/-0.002% resolution
• Input ranges up to 0-7V
• High SNR: up to 110dB
• Low power consumption: 2mA
• Selectable sample rate: 75kS/s to 300kS/s

The AD7890AR-4 is an excellent choice for applications that require precision measurements with low power consumption.

Working Principle of AD7890AR-4

The working principle of the AD7890AR-4 is based on a two-stage delta-sigma converter. This device uses a differential input stage with dual 16-bit delta-sigma A/D converters on each input. The two delta-sigma converters are coupled together, and their outputs are then combined and fed into a low pass filter. The low pass filter then produces an analog signal which is converted to digital values by a 16-bit digital to analog converter (DAC).

The AD7890AR-4 measures the input signal at the input stage and then stores the data in its internal memory. The data is then processed by the delta-sigma converter, and the result is passed to the low pass filter. The filtered signal is then converted to a digital representation by the DAC, and the result is presented at the Interface Bus (I/O) of the device. From there, the data can be read out and processed by the external system.

The AD7890AR-4 is a highly accurate device for data acquisition and provides a resolution up to 20 bits. It also offers various features such as selectable sample rate, low power consumption, and a high signal-to-noise ratio (SNR). The device also integrates several features that make it ideal for industrial and other automation applications.

Conclusion

The Analog Devices AD7890AR-4 is a special purpose data acquisition device that is designed for precision measurements with low power consumption. Its application field covers various applications such as industrial and Automotive automation, medical and life sciences, audio and video electronics, data acquisition and laboratory test and measurement systems. The working principle of the device is based on a two stage delta-sigma converter and the device is capable of providing a resolution up to 20 bits as well as a high SNR. The AD7890AR-4 is an excellent choice for applications that requires highly accurate and low power consumption data acquisition.

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