[SI-LIST] Re: Clock-recovery for Dummies?
- From: John Coupland <coupswork@xxxxxxxxxxxxx>
- To: jkeeble@xxxxxxxxxxxx
- Date: Mon, 19 Aug 2002 09:33:52 -0700
Steven,
I have successfully used the Micrel-Synergy
SY87701 clock recovery chip. The data sheet
provides good information. They have other parts
too and APP notes.
Regards,
John Coupland
Talon Instruments
Jon Keeble wrote:
>
> Manufacturers are a good starting point.
>
> For some history, TI has an application note for a digital PLL in their
> document sdla005b.pdf (March 1997).
>
> Philips has an implementation of the Alexander phase detector coupled with a
> ring oscillator (622 Mbits)
> http://www.semiconductors.philips.com/acrobat/datasheets/TZA3004HL_2.pdf
>
> Some parts will work within a tight range of bit rates centred on standard
> comms frequencies (155 / 622 etc) over +-100pm.
>
> Others, like the Cypress Hotlink parts function at any speed upto an upper
> limit (some parts 200 Mbits).
>
> FPGAs from Altera include analog PLLs and CDR (an130.pdf).
>
> Generally, FPGAs from Xilinx have digital PLLs (DLLs) and don't support the
> recovery of clock and data. However, there is a method of sampling the data
> at a slightly higher frequency than the bit rate that recovers data without
> recovering the clock (XAPP244), and there is a recent note XAPP250 (April
> 2002) that discusses CDR at upto 450 MHz in VirtexII parts in conjunction
> with an external VCO (for instance Maxim parts 2605 - 2609).
>
> Regards
>
> Jon Keeble
>
> ----- Original Message -----
> From: "Steven Kan" <steven@xxxxxxxxxxxxxxxxxxxx>
> To: "SI-List" <si-list@xxxxxxxxxxxxx>
> Sent: Saturday, August 17, 2002 3:51 AM
> Subject: [SI-LIST] Clock-recovery for Dummies?
>
> >
> > Can someone recommend a good online introduction to practical applications
> > of clock-recovery chips? We currently know nothing about these except for
> > what goes in and what comes out :-)
> >
> > Thanks!
> >
> >
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