Xtal as resonator

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DirkBroekhoven

New Member
Maybe a stupid question.

Today I went to an electronics component market here in Beijing.
I tried to find a 16MHz 3 pin ceramic resonator for my 28X1 controller. The only thing I found is a 2pin xtal at 16MHz.

Can I use these?
:confused:
 
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MartinM57

Moderator
Yes, but you also need 2 small capacitors from each pin to earth. Usualy 10pF to 22 pF or so, and the datasheet (what datasheet?) for your crystal will tell you what value to use.

If in doubt, go down the middle at about 15pF...

(a 3-pin resonator is just a crystal with two capacitors fitted internally :))
 
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leftyretro

New Member
MartinM57 said:
(a 3-pin resonator is just a crystal with two capacitors fitted internally :))
Click to expand...
In function but not in construction. A crystal resonator is made from quartz crystal and has a higher 'Q' specification and more accurate frequency. A ceramic resonator is made from well.. ceramic material. They work fine and do save some space.

Lefty
 
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leftyretro

New Member
DirkBroekhoven said:
Lefty,

so do I need to use them with or without capacitors? Or do I just connect the 2 pins without ground?
Click to expand...
Your question is not complete, but if your using a 2 pin crystal or 2 pin ceramic resonator then you need to use the caps wired to ground. If you use a 3 pin ceramic resonator then the caps are built in and you wire the center pin to ground and the other two pins to the crystal pins of the microcontroller chip.

Lefty
 
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