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AD7175-2 Eval Board Noise Test

Question asked by vanaja on Oct 3, 2016
Latest reply on Oct 11, 2016 by JellenieR


   I have AD7175-2 Evaluation Board(EVAL-AD717x-2SDZ(Rev-E)) and carried out Noise test with two different analog inputs derived from on board Reference(ADR4450) as below Fig.1 & Fig.2 and observed ADC Signal variation (for 1000 Sample data's)


Note: Both Fig(1 & 2) ADC Register Configurations are same
   1. ODR = 250 KSPS
   2. ADC Mode - Continuous conversion mode
                                             Fig - 1



                                                Fig - 2



Why ADC signal variation is 250uV in Fig-1 Analog input Configuration? Please Explain.