Electronics > Projects, Designs, and Technical Stuff
Measuring time span very precise
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HendriXML:
A summary action list without a level shifter would be:
1) Program CKSEL Fuse to 0000
2) Cut traces to XTAL1 and XTAL2
3) Add clock output of TCXO Oscillator to XTAL1
4) Add power and components to Oscillator

I think I'll glue the TCXO Oscillator to the Atmel chip, in that case it would be very easy to solder the output to XTAL1.
HendriXML:

--- Quote from: HendriXML on September 09, 2019, 01:49:33 pm ---I think I'll glue the TCXO Oscillator to the Atmel chip, in that case it would be very easy to solder the output to XTAL1.

--- End quote ---

Glueing the oscillator to a heat source might not be the best of idea. So will do it on the board. 
Kleinstein:
The external oscillator should also work with the clock setting for the crystal currently used. Chances are even better than that it works with 3.3 V level. In this case one needs cut the XTAL2 line. With fuse setting 0000 (that is external clock) one could get away without cutting the trace at XTAL2 as the pin would be unused in this case.

The board just below the µC  is probably the better position than on top of the µC.
magic:
Desolder the resonator instead of cutting traces. Put a big blob of solder on each end and melt them both at the same time by applying soldering iron to the side.

Then you will realize it's easier to put an SMD quartz there instead of modding the board for active generators.
HendriXML:
I also searched for a different TCXO Oscillator:
https://nl.mouser.com/ProductDetail/ECS/ECS-TXO-5032-160-TR?qs=GSXfdiLIrOFsAHbhYZImDw%3D%3D
The previous one was shockingly small 2.0 x 1.6 mm.., this one 5.0 x 3.2 mm that's a bit better. I guess the pictures didn't match the smaller component.

I understand now what Ian meant with the small s..t caps.

They don't show not much info on how to implement this component. Would a normal THT ceramic bypass cap of 100 nF be ok? Or does it need to be SMT for its "short" legs?
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