AD7781CRZ

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Analog-to-digital converters (ADCs) are among the most common components used in data acquisition applications, allowing analog signals to be transformed into digital signals which can then be analyzed and manipulated by microprocessors. The AD7781CRZ is a high-precision, low-power, integrated analog-to-digital (A/D) converter designed to measure ac and dc signals. It is commonly used in applications such as digitalized audio amplifiers, active filters, data acquisition systems, digital receivers, and motor control applications. This article will discuss the features, applications, and working principle of the AD7781CRZ.

Features of the AD7781CRZ

The AD7781CRZ is a 8-bit, 10 kSPS ADC that operates on a single 3.3 V supply. It features a reference voltage range of 0.3 V to 2.048 V, an input voltage range of 0.3 V to 4 V, and an absolute accuracy of ±1.0 LSB at 10 kSPS. It requires a settling time of 60 μs and a total current of 3.1 mA when sampling a 10 kHz signal. In addition, it offers a DR of 75 dB, a SNR of 74 dB, a THD of 68 dB, and a SFDR of 87 dB. It also offers many advanced features, such as digital calibration, fast settling time, eight levels of gain settings, digital output, compatibility with logic levels from 0.7 V to 3 V, high linearity, and low power consumption rates.

Applications of the AD7781CRZ

The AD7781CRZ is well-suited for applications such as digitalized audio amplifiers, active filters, data acquisition systems, digital receivers, and motor control applications. It offers excellent noise performance and low power consumption, making it ideal for battery-operated systems. It is also compatible with logic levels from 0.7 V to 3 V, enabling it to be used in many applications with different logic levels. Furthermore, its digital output allows it to be integrated into digital signal processing (DSP) applications, providing an easy way to interface with a microprocessor.

Working Principle of the AD7781CRZ

The AD7781CRZ is a single-slope integrating ADC which works by measuring the voltage across a capacitor that is discharged over a predetermined amount of time. When the ADC receives an analog input, it begins the conversion process by charging the capacitor. The time it takes for the capacitor to charge is proportional to the value of the input voltage. When the voltage reaches a reference level predetermined by the reference voltage selection pins, the charging is stopped and the capacitor is slowly discharged back to its starting point. The time it takes for the capacitor to discharge is then measured, and the time difference is used to calculate the input voltage.

Conclusion

The AD7781CRZ is a high-precision, low-power, integrated analog-to-digital (A/D) converter designed to measure ac and dc signals. It is commonly used in applications such as digitalized audio amplifiers, active filters, data acquisition systems, digital receivers, and motor control applications. It offers excellent noise performance, low power consumption, digital calibration, fast settling time, eight levels of gain settings, digital output, compatibility with logic levels from 0.7 V to 3 V, high linearity, and low power consumption rates. The AD7781CRZ works by measuring the voltage across a capacitor that is discharged over a predetermined amount of time, and the time difference is used to calculate the input voltage.

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