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Video Isolation — Parallax Forums

Video Isolation

BTXBTX Posts: 674
edited 2015-06-06 05:01 in Propeller 1
Hi all.
Does anybody did a schema to isolating the video output from the Pchip ?
Or, any ideas of how to do it ?
Cheers.

Comments

  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2015-06-05 12:03
    A video isolator perhaps?

    -Phil
  • BTXBTX Posts: 674
    edited 2015-06-05 13:01
    Yes Phil.

    Just found the HCPL-4562 opto in DigiKey, I think it could be great !!
    Thx'u
  • Peter JakackiPeter Jakacki Posts: 10,193
    edited 2015-06-06 05:01
    BTX wrote: »
    Yes Phil.

    Just found the HCPL-4562 opto in DigiKey, I think it could be great !!
    Thx'u

    Hi Alberto!
    I did a couple of designs with this device and there is a little bit of tweaking necessary IIRC. If you want a copy of the circuit that works just let me know.Remember that you will need an isolated DC-DC converter with filtering or linear regulation to drive the output stage cleanly. However I would be more inclined to build in the isolation at the digital stage if that were possible. For instance, if it's composite video you could easily have 3 channel solid-state isolator chip with it's own built-in DC-DC converter. It's so much simpler and there is no need for any kind of trimming then. I've used ADUM5402s but there is quite a few to choose from these days.
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