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

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From: Bruce W. Marler (BMarler@WooshCom.com)
Date: Thu Jan 13 2000 - 15:37:19 PST


Daisy chaining won't work because any board can drive the bus.
Bruce
----- Original Message -----
From: Jon Keeble <jkeeble@alpha.net.au>
To: <si-list@silab.eng.sun.com>
Sent: Thursday, January 13, 2000 2:25 PM
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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