interface an external high precision low noise delta-sigma ADC with Arduino

and you think that i have not searched enough about it and directly coming to this forum asking the question?
i have definitely looked all those libraries and tutorials but in my case the input signal is time varying and require greater samples at the output which i am unable to receive. so my question was in regard to that if anyone else has worked with similar kind of adc to capture ac signals , that can be a help to me.
btw thanks for letting me know how to use google and type on it!