Can anyone tell me the different between analogue and digital ground and how do i know which components are fall under which side??
"That is a question which is bigger than this forum." And entirely off-topic: this forum is for discussing Keil Software tools - not the details of circuit design! http://www.keil.com/forum/ I suggest you go to the support sites of the major ADC manufacturers - eg, Analog Devices, National Semiconductor - and check out the design materials there...