[SI-LIST] Re: Crystal datasheet!!

Hello
Is there any relationship between the Q factor and frequency tolerance 
of a crystal? Can I assume both to be the same quantity?

-Ashish

Raymond Anderson wrote:
> 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
>> 
>>
> 
>  
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> 
> or to administer your membership from a web page, go to:
> http://www.freelists.org/webpage/si-list
> 
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> 
> List FAQ wiki page is located at:
>                 http://si-list.org/wiki/wiki.pl?Si-List_FAQ
> 
> List technical documents are available at:
>                 http://www.si-list.org
> 
> List archives are viewable at:     
>               http://www.freelists.org/archives/si-list
> or at our remote archives:
>               http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
>               http://www.qsl.net/wb6tpu
>   
> 


------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List FAQ wiki page is located at:
                http://si-list.org/wiki/wiki.pl?Si-List_FAQ

List technical documents are available at:
                http://www.si-list.org

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: