AD7781CRUZ

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Introduction

Data acquisition refers to the process of collecting data from physical sources and then transforming it into digital form for further processing, analysis and storage. In this process, analog to digital converters (ADC) are used to convert analog signals into digital signals that can be understood and used by digital systems. The AD7781CRUZ is an analog-to-digital converter (ADC) manufactured by Analog Devices. It is a monolithic sampling capacitor array capable of converting 4-20mA current signals from industrial sources with resolutions up to 24-bit. In this article, we will take a look at the application field and working principle of the AD7781CRUZ ADC.

Application Field

The AD7781CRUZ is primarily used for industrial current signal conversion. Its dedicated circuitry and wide dynamic range makes it ideal for isolation, signal conditioning and scaling of low-level current signals. The 4-20mA current signal is frequently used in industrial settings as it provides a safe and reliable analog signal that can travel long distances without significant attenuation or signal distortion. After conversion, the current signal can be used for data logging, process control and system automation tasks.

The AD7781CRUZ works best in applications with current sources ranging between 4 and 20 mA. However, the ADC also works for signals outside of this range. For low signals, the ADC can be configured to scale the signal down to the desired range. For higher signals, the ADC can be configured to scale the signal up to the desired range. Additionally, the ADC can also be used for RTD (Resistance Temperature Detector) sensing and other industrial applications that require accurate signal conversion.

Working Principle

The AD7781CRUZ uses a sampling capacitor array and a delta-sigma ADC to convert the input current signal into a digital signal. The sampling capacitor array is composed of 16 individual capacitors which are configured in parallel to sample the input current. The delta-sigma ADC then converts the sampled signal into a 24-bit digital word. This digital word is then transferred to an output port for further processing.

The AD7781CRUZ’s sampling capacitor array is dynamically resized to optimize the ADC’s performance. The capacitance of the individual capacitors is adjusted depending on the input current so that the signal is accurately sampled and converted into a 24-bit digital word. This feature allows the ADC to accurately and reliably convert signals with high levels of precision and accuracy.

The AD7781CRUZ also features a programmable reference voltage and a power-down mode. The programmable reference voltage allows the user to set the reference voltage for the ADC, thus setting the output resolution. The power-down mode allows the user to put the ADC in a low-power operating state when it is not in use. This feature improves overall power efficiency and reduces power consumption.

Conclusion

The AD7781CRUZ is an analog-to-digital converter (ADC) manufactured by Analog Devices. It is a monolithic sampling capacitor array capable of converting 4-20mA current signals from industrial sources with resolutions up to 24-bit. The AD7781CRUZ is ideal for industrial current signal conversion applications and can be used for RTD sensing and other industrial applications that require accurate signal conversion. It uses a sampling capacitor array and delta-sigma ADC to sample and convert the input signal into a 24-bit digital word. Its programmable reference voltage and power-down mode further improve its performance and efficiency.

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