Sigma-Delta Convertor: Functions & Advantages/Disadvantages

[propergomper]

hi i was wondering if anyone could tell me about a sigma-delta convertor

what its general functions and the advantages/disadvantages over other ADC's?

thanks

 

[berkeman]

The wikipedia.org article on ADCs includes the sigma-delta converter, along with a comparison to other topologies of ADCs:

http://en.wikipedia.org/wiki/Analog-to-digital_converter