Hi! On page 25-25 in the MCF52223RM, it says
"
The ADC consists of a cyclic, algorithmic architecture using two recursive sub-ranging sections (RSD#1
and RSD#2), shown in
clock, resulting in an overall conversion rate of two bits per clock cycle. Each sub-ranging section is
designed to run at a maximum clock speed of 5.0 MHz. Thus a complete 12-bit conversion takes 6 ADC
clocks (1.2ms), not including sample or post processing time."
I'm guessing that it should be µs, instead of ms 
just in case you want to change it!
I found no other way of contacting freescale, save starting a support errand...
