[SI-LIST] Re: Single crystal driving two different inputs of a chip
- From: "Rohan Hubli" <Rohan.Hubli@xxxxxxxxxxxxxxxx>
- To: <ray.anderson@xxxxxxxxxx>
- Date: Tue, 28 Jun 2005 14:46:17 -0700
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=20
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,=3D3D20
Can a single crystal be driving two different inputs of a chip that feed
=3D3D
into=3D3D20
two sensitive analog blocks within a chip. Has anyone had any experience
=3D3D
doing this kind of a thing on the board ?=3D3D20
We are facing an issue where a 27Mhz crystal clock needs to be hooked up
=3D3D
to drive=3D3D20
two sensitive analog cores.=3D3D20
If we make the connection internal to the chip then the jitter due to =
=3D
=3D3D
(trace delay + buffer delay + process variations)=3D3D20
has significant impact on the audio quality.
Not to mention the fact that any issues that surface and subsequent =
=3D3D
fixes with this approach will have significant=3D3D20
respin costs for the chip.=3D3D20
Your inputs would be greatly appreciated.=3D3D20
Thanks
Rohan=3D3D20
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=3D20
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