LVDS without termination

Kolja Sulimma <news@sulimma.de> wrote:
> Gabor wrote:
> > Kolja Sulimma wrote:
>  >>Now 0.5mm single in line resistor packs would be
> >>great (Pinout A1-A2-B1-B2-....). But dual in line resistor packs are
> >>rather useless unless I can route a signal between the pins.
> > 
> > Check out Bourns CAT16-PT4F4 or CAT16-PT2F2.  These are 0.8mm, not 0.5
> > but they route through nicely on the surface (they're DIP but work like
> > a SIP because opposite pads connect together).

> You are aware that I need to do parallel termination, not series 
> termination? I use these resistor arrays a lot, but as you can not route 
>   between the pins they are really inconvenient for LVDS parallel 
> termination.

> But we are really OT for this group now. Is there a sci.pcb.layout 
> newgroup or something?
> ;-)

Have a look at digikey. They have a lot of special footprints, e.g. 
RT1710B6P.

Hope this helps
-- 
Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------

Kolja Sulimma wrote:
> Gabor wrote:
> > Kolja Sulimma wrote:
>  >>Now 0.5mm single in line resistor packs would be
> >>great (Pinout A1-A2-B1-B2-....). But dual in line resistor packs
are
> >>rather useless unless I can route a signal between the pins.
> >
> > Check out Bourns CAT16-PT4F4 or CAT16-PT2F2.  These are 0.8mm, not
0.5
> > but they route through nicely on the surface (they're DIP but work
like
> > a SIP because opposite pads connect together).
>
> You are aware that I need to do parallel termination, not series
> termination? I use these resistor arrays a lot, but as you can not
route
>   between the pins they are really inconvenient for LVDS parallel
> termination.
>

Look at the data sheet.  The connection looks like:

1 --------------- 8
         |
         R
         E
         S
         |
2 --------------- 7

and so on, where all RES are 100 ohms.  It is really made for this type
of termination.  The only thing you would like is finer pitch.

> But we are really OT for this group now. Is there a sci.pcb.layout
> newgroup or something?
> ;-)
> 
> Kolja