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AD7718 R-C Filtering on AIN/REF inputs

Question asked by wineisgud4u on Feb 26, 2018
Latest reply on Feb 28, 2018 by JellenieR



I'm using the AD7718 ADC and I'm not sure the best way to filter the AIN inputs, REF+ inputs and AVDD/DVDD inputs. My issue is that I'm going to be using both Single Ended and Differential type sensors but I need to have the flexibility of using either/or on any input. So, I'm not sure the best way to apply and RC Filter, if any. Same question about the REFIN+ input. The attached diagram shows essentially what types of sensors I'm dealing with and the voltages. I was thinking of keeping it simple and just putting a 1k resistor on each AIN input followed by a 0.1uF cap to ground, but my concern was that the caps will be mismatched creating issues for the differential inputs. Any help is much appreciated.