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Altera_Forum's avatar
Altera_Forum
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12 years ago

Locking period of a Femto crystal to give a stable output frequency

Hi all,

I'm working on PCR, so i'm using a femto crystal to generate 27MHz frequency by controlling the duty cycle passed to the crystal.

I wanted to know how long will it take for the crystal to produce a stable frequency upon supplying a certain duty cycle.

The crystal is a Femto clock VCXO ICS810001-21.

Thank you,

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    I think that's a question for IDT. However, they're immediately going to ask you how much of a step you're intending to put on it from which it needs to settle.

    A quick scan of the datasheet didn't reveal anything obvious...

    You might consider the 'Lock time' stated. I appreciate this is from power up, but if you can design for a fraction of such a delay then I think you'll be on the right lines.

    Cheers,

    Alex