If you are talking modern consoles: Playstation, Playstation 2, Xbox, Gamecube, Dreamcast you can use the XArcade BYOA kit and console adapters. The BYOA kit has a button press (mode change) that will allow you to use digital controls for use in games that use analog controls. Given that it is a sort of emulation in that it is open or closed and not pressure sensitive like true analog it will make games playable but maybe not the same feel as true analog.
Hope it helps
-Goz