Sorry for the confusion what i meant is connecting a single crystal = resonator to two oscillators within a chip Hope that clarifies my question=20 -----Original Message----- From: Joseph Wang [mailto:JYWANG@xxxxxxxxxx] Sent: Tuesday, June 28, 2005 3:02 PM To: Rohan Hubli; ray.anderson@xxxxxxxxxx Cc: si-list@xxxxxxxxxxxxx Subject: RE: [SI-LIST] Re: Single crystal driving two different inputs of a chip=20 Should not be a problem. In my previous board design, we connect four clock inputs together to a signal oscillator, running 33MHz. Well, you have to know what you are doing. In rare case, the oscillator has very weaker drive strength. The clock inputs pins on the chip should be close enough, not to rise up SI issue, etc. Anyway, the concern about the jitter is too pessimistic to me. Any reason why and failing case? Regards, Joseph Wang -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Rohan Hubli Sent: Tuesday, June 28, 2005 2:46 PM To: ray.anderson@xxxxxxxxxx Cc: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: Single crystal driving two different inputs of a chip=20 I am talking about onnecting a single quartz oscillator to two clock inputs -----Original Message----- From: Ray Anderson [mailto:ray.anderson@xxxxxxxxxx] Sent: Tuesday, June 28, 2005 2:42 PM To: si-list@xxxxxxxxxxxxx Cc: Ray Anderson Subject: [SI-LIST] Re: Single crystal driving two different inputs of a chip=3D20 Are you asking about connecting a single crystal resonator to two oscillators within a chip (I hope not...) or connecting a single quartz oscillator to two clock inputs? -Ray -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Rohan Hubli Sent: Tuesday, June 28, 2005 2:38 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Single crystal driving two different inputs of a chip Folks,=3D3D3D20 Can a single crystal be driving two different inputs of a chip that feed =3D3D3D into=3D3D3D20 two sensitive analog blocks within a chip. Has anyone had any experience =3D3D3D doing this kind of a thing on the board ?=3D3D3D20 We are facing an issue where a 27Mhz crystal clock needs to be hooked up =3D3D3D to drive=3D3D3D20 two sensitive analog cores.=3D3D3D20 If we make the connection internal to the chip then the jitter due to = =3D =3D3D =3D3D3D (trace delay + buffer delay + process variations)=3D3D3D20 has significant impact on the audio quality. Not to mention the fact that any issues that surface and subsequent =3D =3D3D3D fixes with this approach will have significant=3D3D3D20 respin costs for the chip.=3D3D3D20 Your inputs would be greatly appreciated.=3D3D3D20 Thanks Rohan=3D3D3D20 ------------------------------------------------------------------ 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: =3D3D20 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 =3D3D20 ------------------------------------------------------------------ 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: =3D20 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 =3D20 ------------------------------------------------------------------ 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: =20 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 =20 ------------------------------------------------------------------ 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