[SI-LIST] Re: ppm(parts per million)-Crystal OSC

  • From: bala <balaseven@xxxxxxxxx>
  • To: Jayaprabakaran <jayaprabakaran.k@xxxxxxxxxxxxxxxxxxx>
  • Date: Mon, 2 Jan 2012 19:11:02 +0530

Are tolerance and accuracy same?
bala

On Thu, Dec 15, 2011 at 2:15 PM, Jayaprabakaran <
jayaprabakaran.k@xxxxxxxxxxxxxxxxxxx> wrote:

> Hi Hilal and Vikas,
>
>
> Thanks for the clarification.
>
>
>
> Regards,
>
> Jp
>
>
>
>  _____
>
> From: vikas dhanda [mailto:vikasdhanda7@xxxxxxxxx]
> Sent: Thursday, December 15, 2011 1:14 PM
> To: Jayaprabakaran
> Cc: si-list@xxxxxxxxxxxxx
> Subject: Re: [SI-LIST] Re: ppm(parts per million)-Crystal OSC
>
>
>
> Frequency tolerance (in ppm)=>The Frequency Tolerance of a crystal or
> oscillator is defined as the initial deviation of the crystal or oscillator
> frequency as compared to the absolute at 25°C like it designed for 25Mhz
> but
> measured is 24.999946Mhz So this is the frequency tolerance.
>
>
>
> Where the
>
>
> Frequency stability is the frequency deviation compared to the measured
> frequency at 25°C over the defined operating temperature and voltage
> range.Here we consider 24.999946Mhz as actual frequency (as Measured) and
> calculate PPM with this Frequency but don't consider  25Mhzfor calculation.
>
>
>
>
>
> Regards,
>
> Vikas Dhanda
>
> On Thu, Dec 15, 2011 at 10:25 AM, Jayaprabakaran
> <jayaprabakaran.k@xxxxxxxxxxxxxxxxxxx> wrote:
>
>
> Most of the crystals have two ppm values.
> Frequency tolerance (in ppm) and Frequency stability (in ppm).
> What are the difference b/w two parameters?
>
> Regards,
> Jayaprabakaran
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On
>
> Behalf Of Mike Poorman (Cascade Engineering Svcs Inc)
> Sent: Wednesday, December 14, 2011 11:22 PM
> To: 'si-list@xxxxxxxxxxxxx'
> Subject: [SI-LIST] Re: ppm(parts per million)-Crystal OSC
>
> Think of PPM as a tolerance on the frequency.  The smaller the PPM number
> the more accurate and stable the crystal frequency will be.
>
> Mike Poorman
> EMC Technician
> Cascade Engineering Services, Inc.,
> Email:  v-mipoor@xxxxxxxxxxxxx
>
> This email message may contain confidential and proprietary information.
> Any unauthorized use is prohibited.  If you are not the intended recipient,
> please contact the sender by reply email and destroy all copies of the
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>
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On
> Behalf Of bala
> Sent: Wednesday, December 14, 2011 2:17 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] ppm(parts per million)-Crystal OSC
>
> Hi all,
> I have a little confusion on PPM vs frequency of Crystal Oscillators.How
> important is the term 'ppm' than frequency.Why all the datasheets have both
> units,ppm and Hz.Please clarify,Also how much important is the value of ppm
> on the Signal integrity side,if any.Thanks for your time.
>
> --
> bala
>
>
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-- 
bala

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