[Ether]

Originally Posted by slijin

The QEI can handle a rate of up to 12.5 MHz (see 1.1 & 18 of this doc for more deetails).

^^^that's from the Jag's microcontroller chip datasheet

this is from the datasheet for the Jag itself:

Originally Posted by Bryscus

If you look at the datasheet for the black jaguar, it says 1e6 transitions per second. If you consider that there are 4 transitions used for quadrature encoding you get 250,000 lines per second. With a 100 click per rev encoder you'd get 2500 revs per second.