[SI-LIST] Re: Connector for LVDS
- From: Michael_Greim@xxxxxxxx
- To: swolcott@xxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Tue, 19 Mar 2002 13:28:25 -0600
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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