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Need help with input filter frequency cutoff for AD7799

Question asked by scottdky on Jun 10, 2017
Latest reply on Jul 5, 2017 by scottdky

I would like to design an RC input filter for the AD7799 for a load cell application. I have read this article: Front-End Amplifier and RC Filter Design for a Precision SAR Analog-to-Digital Converter | Analog Devices , but I am having trouble determining the proper specs (e.g. conversion time and input capacitance) in order to apply the same equations to the AD7799.I suspect the equations for an SAR ADC are different from what they need to be for a sigma-delta ADC.


I am taking measurements at the 19.6Hz rate. What should the Fc be for my RC filter for this chip at that rate? What are the equations I should be using?