Re: [SI-LIST] : Physcially-small far-end LVDS terminations?

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From: Jim Freeman (freeman@broadcom.com)
Date: Fri Dec 17 1999 - 15:44:17 PST


Hi dan,
    OptEM has such an animal and they pride themselves on it's accuracy.

Jim Freeman

Dan Bostan wrote:

> Milt,
>
> Do you know by any chance where may I find a differential impedance
> calculator?
> Thank you.
>
> Dan Bostan
> Engineer
> Corvia Networks e-mail: dan@corvia.com
> 212 Gibraltar Dr. ph: 408.752.0550/x111
> Sunnyvale, CA 94089 fax: 408.752.0551
>
> ----- Original Message -----
> From: Milt Schwartz x3261 <schwartz@galaxy.nsc.com>
> To: <si-list@silab.eng.sun.com>
> Sent: Wednesday, December 15, 1999 3:06 PM
> Subject: Re: [SI-LIST] : Physcially-small far-end LVDS terminations?
>
> > Eric,
> > You only need one resistor (typ 100 ohms) between the differential driver
> Pair.
> > The resistor should be equal to the differential impedance of the driver
> traces.
> > The LVDS Driver can be used with resistor values from 90 to 120 ohms and
> provide the specified VOC.
> > The manufacturers use split resistors so the VOS specification in TIA/EIA
> 644 can be monitored.
> >
> > regards milt
> >
> > Milt Schwartz
> > National Semiconductor
> > Interface Applications.
> >
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