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.

 

What application are you using the VCTCXO? A typical TCXO performance parameter would be phase noise.

 

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.

 

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.

Are you going to phaselock the TCXO to the GPS reference?

 

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