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Old 16th July 2002, 04:00 PM   #1
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Default TCXO source

Hi there,
I am looking for TCXO (temperature-compensated crystal ocillator) to reclock my DAC.
Anybody know where I can get the precise ones? any frequency
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Old 16th July 2002, 09:01 PM   #2
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Default TCXO source

Search under crystal in "Business Equipment/Test and Measurement" -- there are always sellers of HP TCXO's -- usually these are pulled from HP5328 frequency counters with option 10. Occasionally you will see an HP5334 with same. Lastly, some HP3586's (Selective Level Receiver) have a very stable oven - in this series the option is 004 -- all the above use 10 MHz. You can even buy a rubidium frequency source on EBay if you look frequently enough.

You can also try www.hamtronics.com or www.isotemp.com.
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Old 18th July 2002, 06:20 PM   #3
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Default TCXO and PLL discussion in Analog Dialogu

The new issue of Analogue Dialogue has a lengthy discussion of PLLs and a brief mention of tcxo's -- points out some of the problems using A-T cut crystals

http://www.analog.com/library/analog...pll/index.html

if you're wondering where all the low-noise ampls are coming from , read the article on Ultrasound in the same issue.
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Old 18th July 2002, 08:26 PM   #4
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Question AT cut crystals

Hi Jackinnj,
Where exactly did you find the remark about the AT cut crystals? I could't find it.
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Old 18th July 2002, 08:58 PM   #5
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I snipped from the article below:

<em>Q. Iíve selected my synthesizer based on the output frequency required. What about
choosing the other elements in the PLL?
A. Frequency Reference: A good, high quality, low-phase-noise reference is crucial to a stable
low-phase-noise RF output. A square wave or clipped sine wave available from a TCXO crystal
offers excellent performance, because the sharper clocking edge results in less phase jitter at the
R-counter output. The ADF4206 family features on-board oscillator circuitry allowing low cost
AT-cut crystals to be used as the reference. <b>While predictable AT crystals cost one third as
much as TCXOs, their temperature stability is poor unless a compensation scheme with a
varactor is implemented.</b></em>

I have one of those 10e-9 ovenized sources that I run my counter and synthesizer from.
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