Please see the attached circuit. Can this be circuit connected to sigma delta adc. Does the reference voltge of the sigma delta adc needs to be the same as the comparator input 1.65V. I highly appreciated if you could give me idea about this. Thank you.

 

The ADC input range needs to be equal to or greater than the output voltage of your posted circuit, whatever that is.

 

The ADC input range needs to be equal to or greater than the output voltage of your posted circuit, whatever that is.

thank you for the reply. This is low current detection circuit. There is offset on this with 1.65V on to the U15 op amp.Does the Sigma delta ADC reference input needs to be twice than output voltage.