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Level-translate the output of a TCXO crystal oscillator module
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floobydust:
I need to level-translate the output of a 10MHz crystal oscillator module.
These things are a bit odd, the module runs off 3VDC and outputs "clipped sine wave, DC-cut, 0.8Vpp"
TCXO oscillator module ECS VC-TCXO-39SM 10MHz datasheet pdf

It needs to feed a frequency counter IC 5V CMOS with 3V/0.8V logic levels.

I could try a transistor amplifier or logic gates but not sure.



Alex Nikitin:

--- Quote from: floobydust on July 07, 2017, 07:30:53 am ---I need to level-translate the output of a 10MHz crystal oscillator module.
These things are a bit odd, the module runs off 3VDC and outputs "clipped sine wave, DC-cut, 0.8Vpp"
TCXO oscillator module ECS VC-TCXO-39SM 10MHz datasheet pdf

It needs to feed a frequency counter IC 5V CMOS with 3V/0.8V logic levels.

I could try a transistor amplifier or logic gates but not sure.

--- End quote ---

A good way to do it is to use a suitable fast comparator, something like LT6752, for example.

Cheers

Alex
hcglitte:
I have done this with an unbuffered inverter with a feedback resistor.

http://www.taitien.com/wp-content/uploads/2015/12/AP20100105-Utilize-Clipped-Sine-Waveform-in-Circuit-Design.pdf
Alex Nikitin:

--- Quote from: hcglitte on July 07, 2017, 07:49:25 am ---I have done this with an unbuffered inverter with a feedback resistor.

http://www.taitien.com/wp-content/uploads/2015/12/AP20100105-Utilize-Clipped-Sine-Waveform-in-Circuit-Design.pdf

--- End quote ---

The problem with a "simple" approach is that you don't know how much jitter/phase noise you add to the signal. And usually the point of using an oscillator with a clipped sine output is to get a low phase noise.

Cheers

Alex
BrianHG:
Just following the example 74HC04 illustration in the .pdf is fine.  You only need a single 74HC04 gate in a sot23-5 package, like this guy:
https://www.digikey.com/product-detail/en/fairchild-on-semiconductor/NC7S04M5X/NC7S04M5XCT-ND/673380
Just power the 04 inverter with the voltage you want to drive your logic at.
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