How to: 1.4v TCXO - diyAudio
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Old 18th August 2012, 03:12 PM   #1
cdfr is offline cdfr  United States
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Default How to: 1.4v TCXO

I have a 3.3v 25Mhz ultra low jitter TCXO but I actually need 1.2 or 1.4v clock output.
I could not find 25Mhz TCXO operating at less than 3.3v.

I am currently using a couple of resitors to get 1.4v but the result is hardly satisfactory.
Does anybody know what I should use to lower the clock Vout?

Are there some IC that would preserve low jitter and do the job?
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Old 19th August 2012, 09:10 AM   #2
marce is offline marce  United Kingdom
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Level shifting IC will do the job.
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Old 21st August 2012, 09:08 PM   #3
cdfr is offline cdfr  United States
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Thanks. Do you have any IC ref that would do the job and be ultra lowe jitter?

How about using a fast AOP (which)?
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Old 22nd August 2012, 07:45 AM   #4
marce is offline marce  United Kingdom
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I know there are dedicated clock driver IC's for driving long lines, I would have thought they do a level shifting version, I'll have a look.
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Old 25th August 2012, 06:14 PM   #5
cdfr is offline cdfr  United States
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I found the TI SN74AVCH1T45 which will take my 3.3v click signal and translate it to 1.2, 1.5 or 1.8v but the performance don' appear stellar (If I interpret correctly).
Switching characteristics, between 0.4 to 4.7ns.

The clock I use is a 25Mhz TCXO from Connor and windfield DF75F with 1pS jitter and 0.5ppm stability.
The shifter from TI is going to ruin the performance....

I use the clock to feed a Marvell processor in an audio server application.
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Old 25th August 2012, 08:09 PM   #6
oshifis is offline oshifis  Hungary
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A series resistor and two diodes to the ground would not do the job?
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Old 28th August 2012, 01:16 PM   #7
marce is offline marce  United Kingdom
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Somthing similar to this with level shifting
Non-PLL Buffers - Single Ended - CDCV304 - TI.com


Level Translators - Maxim
Currently no internet at home so sorry for the limited responce.
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Old 28th August 2012, 10:23 PM   #8
cdfr is offline cdfr  United States
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Thanks Marce.
Yes may be the TI LMK00105 could do the job. i am going to read this in detail.
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