[SI-LIST] Re: Connector for LVDS
- From: bala iyer <balamiyer@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 19 Mar 2002 12:03:08 -0800 (PST)
Michael,
Does the frequency at which Mr.steve is planning to
run the interface (@33 MHz) makes this easier (i mean
less careful about the connector selection okay)????
Thanx
bala
--- Michael_Greim@xxxxxxxx wrote:
>
> Hi Steve,
>
> Well there are number of ways to skin this
> cat. The reason that I say that is that given
> short runs this link could work with any number
> of connectors. I have seen folks run lvds signals
> through Din, cpci, pci, mictor etc connectors and
> the link
> still hold together. With my perfect world SI hat
> on, I might advise you to specify a connector that
> provides 100 ohm differential impedance where every
> pair is shielded from the other pairs. Most of the
> connector mfgs have connectors of this sort,
> AMP/Tyco,
> Teradyne, Molex, Fuji takimisawa, are examples of
> this. You could also specify insertion and
> reflection
> loss for the connector. You could also specify a
> crosstalk budget. For alot of folks cost is a
> driving
> factor as these differential optimized connectors
> can be costlyish on a per link basis compared to say
> a edge finger connector.
>
> Then again you could just pick your personal
> favorite
> connector, run a coupled spice sim, and if the eye
> looks good, just specify that connector.
>
> Depending on your system needs, the connector can
> be specified in any number of ways but given your
> short links you will probably be able to use a
> loosely spec'd inexpensive connector and have things
> work just fine.
>
> I hope that this is somewhat helpful.
>
> best regards,
>
> Michael Greim
>
> -----Original Message-----
> From: Steve Wolcott [mailto:swolcott@xxxxxxxxxx]
> Sent: Tuesday, March 19, 2002 11:31 AM
> To: 'si-list'
> Subject: [SI-LIST] Connector for LVDS
>
>
>
> I have a circuit that will be connected through LVDS
> terminated with 100
> ohms. I am only running Clk, Data In, Data Out and
> Sync signals @ 33MHz. The
> LVDS drivers are driven from Xilinx CPLD. The
> connections on board are short
> and direct from the connector. I need to specify the
> connector and have
> little experience with si. Can someone make a
> suggestion, please as to an
> appropriate connector and manufacturer. Your help
> would be greatly
> appreciated. Thank you, Steve
>
>
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