AD7795BRUZ

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Data Acquisition can be defined as a process of conversion of actual physical fields\' values into numerical values. In order to ensure accurate conversion of real physical properties, Analog to Digital Converters (ADC) are used extensively in this regard. One of the commonly used ADC devices is the AD7795BRUZ. AD7795BRUZ is an ultra-high speed and low power SAR-based, 0 to 20 V annotated single-supply ADC device. It supports both single-ended and differential input design. It is designed to offer a quick conversion from analog input signals to digital output code. The device is optimized for precision, low power, and high speed and is suitable for low cost; industrial, medical, and instrumentation applications.

The key features of the AD7795BRUZ design include a high sampling rate of up to 1 MSPS, a 12-bit resolution, a differential input stage and adjustable offset and gain trimming, a SPI and I2C interface, an input stage outperforming all other competing products, and a low power mode. It also includes on-chip temperature sensing and power-down mode, thus making it very versatile.

In terms of application fields and working principle, the device is used mainly in signal conditioning, data acquisition, and motor-control applications. It is also used in a wide range of industrial, medical and instrumentation applications, such as automated process control, machine vision, medical imaging, and environmental monitoring. Moreover, it is suitable for test and measurement, automotive, home and industrial automation and power management.

The working principle of the device is based on the circuitry of its internal ADCs, it applies a successive approximations idea). The wiring diagram of the AD7795BRUZ is illustrated in figure 1, where the device includes an excitation source which supplies an input voltage to the device and a control unit to accept the control signals. In a successive approximation A/D conversion, the input voltage is compared and fed into an internal Analog-to-Digital Converter (ADC) that consists of a voltage reference, a sample-and-hold circuit, a successive-approximation register and a 12-bit comparator. Comparing the input voltage to the reference voltage, the output code is determined by a successive-approximation procedure. The device also features an on-board, 12-bit voltage reference as well as an easy-to-use SPI or I2C-compatible interface.

In summary, the AD7795BRUZ is an ultra-high speed and low power SAR-based, 0 to 20 V annotated single-supply ADC device. Its key features include a 12-bit resolution, a differential input stage and adjustable offset and gain trimming, a SPI and I2C interface, an input stage outperforming all other competing products, and a low power mode. It is mainly used in signal conditioning, data acquisition and motor-control applications, and also in a wide range of industrial, medical and instrumentation applications. It works on the basis of successive approximation A/D conversion and includes an excitation source which supplies an input voltage to the device and a control unit to accept the control signals.

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