08-08-2011 04:01 PM
I have a ISG 1394 firewire line scan camera that I want to use in line scan mode. I understand that I need to use a differential TTL pulse, to convert the traditional 5V TTL pulse to differential TTL I am to use the circut listed in http://zone.ni.com/devzone/cda/tut/p/id/6033
I have a TI sn65hvd3082e IC with the logic diagram attached. My understanding is I send the 5V ttl into pin D, then the differential TTL comes out on pins A and B. This doesn't seem to work. How can I wire this up and what would a differential TTL look like on an oscilloscope.
Thanks
08-09-2011 09:58 AM
Hi aricks,
How do you know that "This doesn't seem to work"? How are you currently measuring the signal.
All a differential TTL signal means is that if the difference between pins A and B is 5 V, it registers as a high, and if it's around 0 V, it registers as a low.
You should be able to measure this with an oscilloscope by simply setting the oscilloscope up for a differential measurements and measuring across pins A and B.
Have a great day,
Chris V
08-09-2011 11:05 AM
Apologies for my ignorance, what you described is what I was doing. Do I need to power the IC? The diagram from the NI website just shows a ttl and inverting and non-inverting buffers, which I tried and couldn't get 5V accross a and b with a 5v ttl in.
08-10-2011 08:02 AM
Yes, you must power the IC. You need to also add a bypass capacitor.