Resonators or Crystals

[Ron]

Hi,

I have designed a small PIC board and have chosen a resonator with built in CAPs.

Here is the resonator I have chosen to use, I think the data sheet states +/- .3% Freq Stability

http://www.abracon.com/Resonators/awcr.pdf

Are typical crystals more accurate?

Thanks

Ron

[Benj]

Hello Ron

A standard crystal will have an accuracy of +/- 20ppm or 0.002% , resonators are much less accurate in general.

[Ron]

Hi,

OK, so I want to use a crystal, what type of caps are required?

Will these work http://www.mouser.com/Search/Refine.asp ... 180J-TB-RC

The crystals I want to user are http://www.mouser.com/Search/ProductDet ... 9Z2EojU%3d

Thanks

Ron

[Benj]

Hello

I normally use a value of 22pF but im sure the 18pF caps there will work fine. Your crystals look fine.

[Ron]

Hi,

I will check to see if I can get this cap in a 22pf version.

Thank you,

Ron

[Ron]

Hi Ben,

How accurate are the internal OSC on the newer PICs, 16F887, 18F2620? I could not locate anything regarding this ini the datasheets.

Thanks

Ron

[Dan81]

you can find this data page 256 (or 257) for the 16F887

Daniel