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Filter stage in Signal Chain solution - Need & Selection


I am designing a high resolution and accuracy solution at a low frequency (<10kHz) and aiming to achieve the best possible stability. Checking out the signal chain solutions in the Precision Narrow Bandwidth webpage, there is a filter stage in the signal chain option I am planning to design.

Why do I need an RC filter in front of a precision ADC? How do I select the RC filter values?


Thanks in advance for your support.