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Crystal Oscillator Operation

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electronicsman

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Yes very basic question please help me to understand how crystal oscillator works. It has got two pins OSC1 and OSC2 what those pins indicate whether I need to give 5v to both of them? What is the sequence of steps to make the crystal oscillator to work? At least the proper links for understanding. I am unable to make a small oscillator to work.:cry: or at least find the root cause.
 

Look up the datasheet for the chip you are using at the manufacturer's website.
 

Hi
Is it oscilator or crystal? you say there is only 2 pins , OSC1,OSC2. what about Out and VCC.Can you share oscillator part number?
 

probably uses a schmitt trigger invertor. the crystal is connected from the input to the output of the invertor. Typically each side of the crystal as a small capacitor to ground. The value of the capacitor depends on the crystal, they will have a spec, 18pf, 30pf etc. The value you use, has to take in the capacitance of the IC input/output pins.

Say you have a 18 pf crystal, and the IC has 6pf to ground. The crystal would see 3 pf across it (6pf in series with 6pf). that means you need another 15 pf. If you tie a 30 pf cap to ground on each end of the Cap, you get 15pf (30pf series 30 pf=15pf)
 

electronicsman said:
I am sorry it is a crystal not an oscillator.
Click to expand...
A crystal is a passive part and cannot oscillate by its own.
For oscillating purposes, it needs a surrounding circuitry with an an amplifier (opamp or transistor).
 

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