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ADS131A04: Using XTAL2 to drive additional ADS131A04's

David Dudley
Expert 1280 points
Part Number: ADS131A04


I've got a project where I'm going to be using 7 ADS131A04 devices for sensor inputs.  Can I use a crystal on the first one, and drive the additional 6 with the XTAL2 pin from the first, or do I need a separate oscillator to drive all of them?

  • 0
    TI__Guru 66706 points

    Hi David,

    Thanks for your question! If you are using XTAL1 only as the clock input, then you must be using a single-ended crystal oscillator, which includes some buffer already, correct? My initial assumption will be that it is better to share the output of your clock buffer with the XTAL1 pins of all your A04 devices rather than rely on the drive strength on the internal clock buffer to drive the XTAL2 pins of other devices. I don't believe the internal clock buffer drive is intended to drive other clock inputs, but I would have to check with a designer to confirm. Let me know if you need me to.

    Besides the drive strength, you also need to be concerned with introducing phase delay between the converters. I imagine that you want all channels converting simultaneously, so you will want to keep the clock input path symmetrical for all devices for that reason as well.

    Best Regards,