AD977CRS

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Analog to digital converters (ADCs) are renowned for their ability to quickly and accurately convert analog signals into digital signals. The AD977CRS is a wideband sigma-delta analog-to-digital converter that uses a single-channel architecture to achieve its high performance. This guide will provide an overview of the AD977CRS application field and working principle.

The AD977CRS features a wide range of input frequencies from 4kHz up to 400kHz, making it suitable for a wide variety of applications. It is optimized for battery operated equipment, providing low quiescent current, high channel-to-channel isolation, and low signal leakage current. Its high-speed, low-noise performance makes it well-suited to data acquisition applications such as medical imaging, instrumentation, and signal analysis.

The AD977CRS utilizes a sigma-delta architecture that employs feedback loop concept where the signal is sampled by the converter, digitized by a set of single-bit successive approximation registers, and then passed through an oversampling integrator. This architecture provides a high signal-to-noise-and-distortion ratio, ensuring accurate signal reconstruction and sufficient resolution for accurate data conversion.

In addition, the AD977CRS features a fully-differential, high-accuracy low-noise analog input, providing excellent signal-to-noise ratios and low input-referred noise. This ensures that a wide dynamic range is maintained even at the highest sampling rates. The AD977CRS also features low-distortion output clocking with programmable clock dividers, which enables multi-channel operation with low crosstalk and noise.

The AD977CRS also features a two-stage calibration algorithm that corrects for the non-idealities found in the high-precision analog-to-digital converters. This allows the converter to continually monitor the input signal and apply corrections on a per-channel basis. This ensures the highest level of accuracy and eliminates the need for external calibration circuitry.

The AD977CRS incorporates many features and capabilities that make it a very attractive choice for data acquisition applications. Its wideband performance, high-accuracy, and low-noise characteristics make it well-suited for medical and instrumentation applications. Furthermore, its calibration features ensure excellent accuracy and performance over the long term.

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