Please take a look at the remote control crystal oscillator ?

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928928
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Posts: 3
Joined: Wed Nov 28, 2018 4:24 am

Please take a look at the remote control crystal oscillator ?

Postby 928928 » Fri Dec 14, 2018 7:41 am

Knowing the basic of crystal oscillators helps users ask the right questions when choosing a device for their designs.
Recently, I read an article about crystal oscillator, which talked about the functions and working principles of the crystal oscillator. I think it's useful, and It helps me a lot when I studied the crystal oscillator(to know more about this article, one can visit the website:http://www.apogeeweb.net/article/147.html).
However, now I am meeting a problem. which is in the following picture.
Is this active or passive? Can I replace it with another brand? What does 13.000 79.79 mean? 
It makes me confused. So if anyone knows the answer, could you please share it to me? Thanks a lot.
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mon2
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Joined: Thu Jun 10, 2010 11:43 am

Postby mon2 » Tue Dec 18, 2018 2:24 pm

Hi. This is a SMD oscillator or crystal. Here are some ideas to determine which...

review the following pinout of this part:

oscillator.png


Power down this product. Be sure there is no power to the PCB (wait 5 minutes to discharge all capacitors on the PCB if required).

Check with a meter if there is a contact between pins 2 & 4 - if yes, then this is a CRYSTAL @ 13.00 Mhz frequency.

If this is a crystal, here is the internal view:

smd_crystal.png



If there is no contact between pins 2 & 4, then confirm that pin 2 = Ground and that pin 4 = +voltage. Check with the meter, carefully with RED lead of your meter on pin 4 and BLACK lead of your meter to ground. What voltage do you read? Guessing +3v3 but could be other values. This confirms this part is an active oscillator with internal crystal (may be a MEMS oscillator = solid state version) + logic to drive the clock output.

If this part is an oscillator then often:

pin #1 = OE = output enable. Typically, if logic high, then a clock is enabled on pin # 3.
pin #2 = ground
pin #3 = clock_output
pin #4 = power (+voltage and may be +3v3 or +1v8, etc.)

Next, measure the size of the body of this device which may be 3225 or similar = 3.2mm x 2.5mm smd (surface mount device). This part is often < $2 for most variations in low volume and even lower in volume of a few thousands of pieces. We are starting to use more and more MEMS oscillators at our company and the surface looks very similar to this component.

There are many such suppliers around the world but you can check around for the graphic logo (lower left corner) on the component. The specs of part may define the quality of your audio or whatever this device is.

Good luck!
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