Hi Chaitanya,
Thank you for using ADi products and sorry for the delay of response.
About your questions.
- Yes, as what the datasheet stated, the device will convert ac voltage (or AC plus DC) to its equivalent DC voltage. The input of AD636 can go up to +/-12Vpp continuous non destructive input and 200mV rms continuous rms level.
- Yes, It can work on single supply. AD636 can be used with unipolar supplies as low as 5 V and up to 24 V. You can refer to the datasheet for proper connection of the supply (page 10 of 16).The device will work the same with single supply as with dual supply for AC input however it is impractical when you have DC or DC plus AC input due to the resultant dc level shift at the input. I suggest that you power the device in dual configuration if you have ac plus dc input.
On the other hand, would it be okay if you could tell me your application? Let me know if you have any more concerns.
Regards,
Phil