• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 2 answers
  • Subscribers 34 subscribers
  • Views 204 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AM26C32: encoder feedback -this ic possible or not in long input traces via cable

krishnaprasad MB
Prodigy 70 points
Part Number: AM26C32

I m selected this part for receiving differential signal from encoder feedback from motor.motor is located 8 meter from controller pcb .layout guidlines of this ic says the input traces are most critical part .(short length is important). I need clarification for this application .another option is to use SN65HVD3088.please give me a best one

  • 0
    Guru 316470 points

    These are general guidelines. The two differential traces in a pair should be routed parallel to each other, but differential transmission is designed for long distances.

    The AM26C32 and SN65HVD3088 (and any other RS-422 receivers) behave the same in this regard.

  • 0
    TI__Guru 52052 points

    Hi Krishna,

    So 8 meters is not an issue for the differential trace length (especially with termination) . What this is trying to say is that you should make the traces take the most direct path possible (i.e. the shortest) . You should try to take the most direct path that they can and they should have very high routing priority comparatively to other components that may be near these traces.  Part of this is to minimize impedance discontinuities at the receiver which will help mitigate potential SI issues.  

    RS-422 like this device is designed for long distance wired communication - but the traces should take as direct of a pathway as possible. 

    Please let me know if you have any other questions (either device will be fine - the first one you have picked is 100% okay as the advice would stay consistent across our RS-4## type devices).

    Best,

    Parker Dodson