Tuning of a VCTCXO

Discussion in 'General Electronics Chat' started by Yvanohe, Feb 28, 2011.

  1. Yvanohe

    Thread Starter New Member

    Feb 14, 2011
    6
    0
    Hello,
    I need to finely control a 10 MHz VCTCXO, with +/-5ppm pullability (1.5V +/-1V). I 'm looking for a DAC but I'm wondering what is the resolution I can expect... 16 bits: LSB= 15uV, 20 bits: LSB =953nV, 32 bits:232pV...
    L'AD5791 Low noise DAC, for example, has a Voltage noise of 7.8nV/sqrt(Hz). 32-bit resolution is discarded. Could I expect to use a 24-bits DAC(LSB=60nV)? 20 bits(LSB=953nV)? Less?
    How can I calculate an accurate voltage noise on the Voltage Control pin of the VCTCXO? What's the resolution It is reasonable to expect? Any other criteria I should consider?


    Thanks.
     
  2. lkgan

    Member

    Dec 18, 2009
    117
    0
    What application are you using the VCTCXO? A typical TCXO performance parameter would be phase noise.
     
  3. Yvanohe

    Thread Starter New Member

    Feb 14, 2011
    6
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    I need to tune my 10MHz TCXO to adjust a 292,xxx MHz clock for a the DAC of a Base-Band Modulator. I need to adjust my 10 MHz to a GPS reference.
     
  4. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    656
    Are you going to phaselock the TCXO to the GPS reference?
     
  5. Yvanohe

    Thread Starter New Member

    Feb 14, 2011
    6
    0
    yes. The GPS is the primary reference. If the signal disapear, It's replaced by the 10 MHz TCXO
     
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