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Thread: Signal impedance for teensy 3.5 / 4.1

  1. #1
    Junior Member
    Join Date
    Jun 2019
    Posts
    7

    Signal impedance for teensy 3.5 / 4.1

    Dear all,

    I am currently running a OCXO at 10Mhz without issue on a teensy 3.5 : I am a using the FTM1 counter to count the pulses accurately.

    I would like to replace it with this product or similar / https://ww1.microchip.com/downloads/...DS50003041.pdf (p.16)
    However, as I am not an expert on signal (impedance etc,) I wanted to get your thoughts regarding the RF output (10mhz and 1pps) of this module which is high impedance.

    --> Does the teensy can read and count this RF source accurately as it is, as it did for my current OCXO ? (this one : https://fr.dhgate.com/product/1pc-10...49644801.html)

    Many thanks for your help!

  2. #2
    Senior Member
    Join Date
    Jul 2014
    Posts
    3,466
    I was once using a CSAC on a Teensy (3.3V, don't recall Teensy model) and it was working fine (maybe there is still trace of it on Forum),
    Never used it afterwards as these particular CSAC was known to lose vacuum when getting over 30C

  3. #3
    Junior Member
    Join Date
    Jun 2019
    Posts
    7
    thank for your feedback ! So you confirm that the signals (10Mhz and PPS), directly connected to the teensy, are recognized and can be used ?

    Morever, it is a shame that a miliatry grade product lose vaccuum over 30C .... I hope they have corrected that !

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