[SI-LIST] Re: Crystal datasheet!!

Ashish-

Perhaps these numbers will be of use to you. These are some typical  
parameters for a few assorted AT cut crystals in the 3-10 MHz range.

Freq     Lm (H)    Cm  (pF)    Co  (pF)      ESR (ohms)        Q
 3.58      0.13          0.0152      3.35              58               
    50,000
 5.0        0.098        0.0134      2.275            12.8             
240,000
10.0       0.020         0.0126     2.8                  6.3             
200,000


        ---+---Lm-----Cm-----ESR---+----
              |                                           |
              +---------Co---------------+

Depending on the quality of  the crystals the ESR and Q can vary quite a 
bit with high quality commercial and communications quality parts having 
much lower ESR and higher Q as compared to the common mass produced 
consumer parts. As I mentioned these parameters are for AT cut crystals. 
Other cuts may have somewhat different characteristics.

-Ray Anderson    WB6TPU

Senior Signal Integrity Staff Engineer
Xilinx Inc.


Ashish PANPALIA wrote:

>Thank you Ray,
>The sites are really useful. But I have one query regarding crystal 
>model. For simulation of crystal oscillator I need the crystal model. 
>Though L and C value I can estimate based on my requirement what should 
>be the range of R value for crystal in my application?
>
>regards,
>Ashish
>  
>
 
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