vaibhavpawar
Junior Member level 1
Input RC filter design for analog pin of ADC
I am implementing ADC filter for AD7705 ( Sigma Delta ADC - Analog Devices Chip ). Input to ADC is constant DC voltage. So, what will be cut-off frequency I should consider to implement RC filter at analog input.
If we are designing RC filter, then by assuming C value ( typ 0.1uF ) and cut-off frequency above which we are trying to block signals (ripples) , we can calculate R value. Is this a approach which we consider for filter design? Am I correct in my consideration.
So for DC input at ADC pin, what should be ideal or practical cut-off frequency I should consider for designing RC filter.
Thank you in advance.
I am implementing ADC filter for AD7705 ( Sigma Delta ADC - Analog Devices Chip ). Input to ADC is constant DC voltage. So, what will be cut-off frequency I should consider to implement RC filter at analog input.
If we are designing RC filter, then by assuming C value ( typ 0.1uF ) and cut-off frequency above which we are trying to block signals (ripples) , we can calculate R value. Is this a approach which we consider for filter design? Am I correct in my consideration.
So for DC input at ADC pin, what should be ideal or practical cut-off frequency I should consider for designing RC filter.
Thank you in advance.