RE: [SI-LIST] : High Speed Backplane Connector Recommendations

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From: John Ellis (jjre@ix.netcom.com)
Date: Fri Jan 14 2000 - 04:38:53 PST


FCI, Siemens and Fujitsu all make excellent connectors for BLVDS
applications and they fall at different price points depending on the bells
and whistles you want to pay for. Each of these companies had connectors
being considered by the "infiniband"(formerly fio/ngio) group. Spice models
are available.

John Ellis

Vice President
Signal Integrity and
Interconnect Business

TriCN Associates, LLC

> -----Original Message-----
> From: owner-si-list@silab.eng.sun.com
> [mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Jon Keeble
> Sent: Thursday, January 13, 2000 4:25 PM
> To: si-list@silab.eng.sun.com
> Subject: Re: [SI-LIST] : High Speed Backplane Connector Recommendations
>
>
> How 'bout daisy chaining the high speed signals (are there only 8 + the
> clock?) through the connector?
>
> This at least eliminates the stub and so maybe the cpci
> connectors could be
> used.
>
> At the very least I'd suggest a modeling exercise is called for -
> AMP supply
> spice models for their parts.
>
>
> Good luck!
>
> Jon Keeble
>
> -----Original Message-----
> From: Bruce W. Marler <BMarler@WooshCom.com>
> To: si-list@silab.eng.sun.com <si-list@silab.eng.sun.com>
> Date: Friday, January 14, 2000 4:57 AM
> Subject: [SI-LIST] : High Speed Backplane Connector Recommendations
>
>
> >I am designing a high speed digital backplane interconnect system and was
> >wondering if anyone had any recomendations about what manufacturer's
> >connectors I should be looking at - either connector to connector systems
> or
> >card edge connector systems.
> >
> >Our system is a multidrop system with up to 18 cards plugging into a
> >backplane. The bus is an 8 wide synchronous LVDS bus with a clock. Each
> >data channel has a rate of 200Mbps, and the clock is 200 MHz. Density is
> >not that great 60 to 80 signals within 3.5" of edge space.
> >
> >Each card will have only one load on it's stub from the main
> bakplane bus,
> >and that load will be mainly capacitive due to the receiver. I
> am looking
> >for connectors that will minimize the distance from the backplane to the
> >receiver chip. Controlled impedance on the connector is not
> that important
> >because I am keeping the length so short. But I do like it when
> connectors
> >have a separate grounding bus connection like the AMP MICTOR or their
> >Micro-Strip connectors.
> >
> >I also like surface mount solutions like the AMP Mictor connector as it
> >would enable me to route the backplane with minimal vias.
> However the AMP
> >Mictor connector is extremely expensive and does not have different pin
> >lengths for hot swapping.
> >
> >Does anyone have any recommendations on connnectors I should be
> evaluating?
> >
> >I have already looked at:
> >AMP MICTOR - very nice small connector 0.4" from backplane to pin - very
> >nice non-typical over-the-edge type connection for right angle
> connector -
> >very expensive - this is my favourite so far, but it's price and lack of
> >support for hot swapping are a problem.
> >AMP Micro-Strip - a little larger than Mictor - 0.6 " - fairly
> >expensive - nice but no support for hot swapping
> >AMP 2mmHM - very long distance from backplane to pins - 1" for farthest
> >pin - supports hot swapping - higher density than what I need.
> >Teradyne's connectors - very similar to AMPs 2mmHM
> >
> >Regards
> >
> >Bruce Marler
> >WooshCom Corporation
> >Denver, Colorado
> >bmarler@wooshcom.com
> >303-697-1577
> >
> >
> >
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