[SI-LIST] Re: Single crystal driving two different inputs of a chip
- From: "Dimiter Popoff" <dp@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 29 Jun 2005 00:58:29 +0300
Drivig two CMOS inputs should be no problem - they present much less load
than AS and F chips used to present in the past (somewhat more capacitance,
but should be no issue).
However, given the analog nature of the signal, the jitter this aproach will
introduce will likely be much greater than it would be if just buffering the
signal.
------------------------------------------------------
Dimiter Popoff Transgalactic Instruments
http://www.tgi-sci.com
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-------Original Message-------
> From: "Rohan Hubli" <Rohan.Hubli@xxxxxxxxxxxxxxxx>
> Subject: [SI-LIST] Single crystal driving two different inputs of a chip
> Sent: Jun 29 2005 00:37:52
>
> Folks,=20
>
> Can a single crystal be driving two different inputs of a chip that feed =
> into=20
> two sensitive analog blocks within a chip. Has anyone had any experience =
>
> doing this kind of a thing on the board ?=20
>
> We are facing an issue where a 27Mhz crystal clock needs to be hooked up =
> to drive=20
> two sensitive analog cores.=20
>
> If we make the connection internal to the chip then the jitter due to =
> (trace delay + buffer delay + process variations)=20
> has significant impact on the audio quality.
>
> Not to mention the fact that any issues that surface and subsequent =
> fixes with this approach will have significant=20
> respin costs for the chip.=20
>
> Your inputs would be greatly appreciated.=20
>
> Thanks
> Rohan=20
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