? An open collector output is just that, open collector. You need to terminate it at the lead end with resistor according to the voltage you're using, to the positive rail. Terminating with a 100R to ground is simply a poor configuration.
Regards Roland 2009/7/17 Jon Elson <el...@pico-systems.com> > Peter C. Wallace wrote: > > One difference is that the TTL inputs have an RC filter, the differential > > inputs have none. > > > > I wonder if your index outputs can drive the termination resistor. Have > you > > measured you index and /index outputs for reasonable differential output > > voltage when terminated by the 7I29? > > > Very good point! Some of these open collector encoders with puny 1 K > (or even higher) pull-up resistors will not give a whole lot of signal > with a 100 Ohm termination. > It wouldn't take a lot of electrical noise to reduce that noise margin > to zero. > > Jon > > > ------------------------------------------------------------------------------ > Enter the BlackBerry Developer Challenge > This is your chance to win up to $100,000 in prizes! For a limited time, > vendors submitting new applications to BlackBerry App World(TM) will have > the opportunity to enter the BlackBerry Developer Challenge. See full prize > details at: http://p.sf.net/sfu/Challenge > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
