AD7745ARUZ

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In the field of data acquisition, ADCs/DACs and special purpose devices are used to convert analog signals into digital signals for processing. AD7745ARUZ is one of these devices, a wide variety digital interface 16-bit ADC, which is used for precision analog signal measurements. This article discusses the application field and working principle of AD7745ARUZ.

1. Application Field of AD7745ARUZ

The AD7745ARUZ is a low-power high-accuracy ADC which measures 16-bit voltage signals and provides a digital interface. It achieves its industry-best performance by using Cadence\'s patented Sigma-Delta conversion technology. This makes it ideal for applications such as portable instrumentation, medical instrumentation, data logging, process control, and embedded systems.

AD7745ARUZ combines an analog front end and a high-resolution encoder with a flexible digital back end that supports both SPI and I2C interfaces. It supports the full-scale input range of 2.5V, 12-bit resolution or 4V, 16-bit resolution. It has an overload characteristics ideal for high-frequency noise environments and a high-speed sampling rate which make it suitable for a variety of applications. The AD7745ARUZ also has programmable settings for digital filtering and gain. All settings can be changed via the control registers, making it ideal for system integration, optimization, and calibration.

2. Working Principle of AD7745ARUZ

The AD7745ARUZ uses a Sigma-Delta conversion technique to convert an analog voltage signal into a digital signal. This technique utilizes a single-bit Analog to Digital Converter (ADC) at the input end of the device. The single-bit ADC is then combined with a digital filter which is known as a “Delta-Sigma Modulator” or “DSM”. The DSM filters and modulates the single-bit output of the ADC, receiving the analog signal into the device and outputting the digital value.

The single-bit ADC and the DSM modulator together form the Sigma-Delta conversion block of AD7745ARUZ. The DSM is used to control the gain and offset errors on the single-bit ADC output by adjusting the values of digital filter coefficients. The DSM also performs digital signal noise-shaping, guaranteeing a high dynamic range, low power dissipation, and low noise. The final output of the Sigma-Delta conversion block is a digital signal.

The AD7745ARUZ has several control registers which can be programmed through the SPI or I2C interface. These registers give the user control over the device clock, data rate, gain, offset, digital filter, and configurable range settings.

The AD7745ARUZ is an excellent choice for applications requiring precision and high performance along with high speed sampling rates. By employing an innovative Sigma-Delta conversion technique, high levels of accuracy and dynamic range can be achieved in a small footprint, low-power device.

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