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A digital output is more desirable than an analog output in noisy environments (e.g. automotive, washing machines,etc.) and remote sensing applications (building controls,industrial applications, etc.) because a digital signal inherently has better noise immunity compared to analog signals.Additional applications requiring a sensor with a digital output include microcontroller–based systems that have no A/D in the system or that have no A/D channels available for the sensing function. For these applications, there is no otheroption but a digital output to further process the signal.
