Ummm... Analog and digital are equivalent. They are merely two different coding schemes for the same information. Digital can have all the resolution of analog and vice versa. In practice though, digital actually has higher resolution due to limitations in the resolution of analog recording mediums. It is a commonly held myth that there is some fundamental difference between the two that stems mostly from a lack of understanding of the relationship between analog and digitally coded forms of a signal. I know this is a little off-topic, but it is an old myth that needs to be squashed (sooner better than later).
Digital IS analog!
(You've got to have a real good d/a and comparator first: all analog.)