[SI-LIST] Re: Crystal datasheet!!
- From: Ashish PANPALIA <ashish.panpalia@xxxxxx>
- Date: Thu, 25 Nov 2004 13:49:23 +0530
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
>>
>>
>
>
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