[SI-LIST] Re: Single crystal driving two different inputs of a chip
- From: "Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>
- To: "'Rohan.Hubli@xxxxxxxxxxxxxxxx'" <Rohan.Hubli@xxxxxxxxxxxxxxxx>, 'Joseph Wang' <JYWANG@xxxxxxxxxx>, "'ray.anderson@xxxxxxxxxx'" <ray.anderson@xxxxxxxxxx>
- Date: Tue, 28 Jun 2005 17:54:39 -0600
I would ask the resonator vendor. If you mess with the capacitive loading
the oscillator may simply not start!
Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Pager/Short Message: 3032042974@xxxxxxxx
Email: charles.grasso@xxxxxxxxxxxx;
Email Alternate: chasgrasso@xxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Rohan Hubli
Sent: Tuesday, June 28, 2005 4:10 PM
To: Joseph Wang; ray.anderson@xxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Single crystal driving two different inputs of a chip
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
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