[SI-LIST] Re: Crystal datasheet!!
- From: "Moeller, Merrick" <mmoeller@xxxxxxxxxxxxxxx>
- To: <ashish.panpalia@xxxxxx>
- Date: Wed, 24 Nov 2004 08:45:59 -0600
Crystal Effective Series Resistance in the
operating region between series resonance and
Anti-resonance is governed by the following.
Re =3D R1 ((CL+Co)/CL)2
Re ESR
R1 Motional arm resistance
CL Capacitive Load
Co Crystal Mounting Electrode Capacitance.
Typical Values for your range of crystal operating on the
first overtone are.
R1 100 ohm
Co 4pf
CL Is what load is presented to crystal. Determines frequency of
operation.
The best way is to get in touch with a crystal builder and
get some specific specs. These parameters can change greatly.
Try www.conwin.com Connor-Winfield Corp.
Merrick
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Ashish PANPALIA
Sent: Wednesday, November 24, 2004 5:22 AM
To: reanderson@xxxxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Crystal datasheet!!
Thank you Ray,
The sites are really useful. But I have one query regarding crystal=20
model. For simulation of crystal oscillator I need the crystal model.=20
Though L and C value I can estimate based on my requirement what should=20
be the range of R value for crystal in my application?
regards,
Ashish
Ray Anderson wrote:
> There is a ton of data on modeling quartz crystals available from many
> sources. Check out the following URL's to get started:
>=20
> http://www.maxim-ic.com/appnotes.cfm/appnote_number/2127
> http://moon.pr.erau.edu/~lyallj/ee412/xtal_imp.html
>
http://www.circuitcellar.com/pastissues/articles/bujanos91/Bujanos-91.pd
f
>
http://www.industrycommunity.com/myforum/moazzam_mahmood/messages/340.ht
ml
> http://www.hy-q.com.au/crystals/crystals-theory.htm
> http://www.foxonline.com/tech3031.htm
>=20
> They aren't data sheets (which usually do not contain the kind of info
> you are after), but are app-notes and tutorials on the topic.
>=20
>=20
> -Ray Anderson
> Senior Signal Integrity Staff Engineer
> Xilinx Inc.
>=20
>=20
> Ashish PANPALIA wrote:
>=20
>=20
>>Hello,
>>I want to design a crystal oscillator of range 4MHz-8MHz. Can anybody=20
>>provide me with the 4MHz-8MHz crystal datasheet with the help of which
I=20
>>can model the crystal in my simulations.
>>
>>regards,
>>Ashish
>>
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>=20
>=20
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