[SI-LIST] LVDS vs RS422
- From: Pauric Hennessy <Pauric.Hennessy@xxxxxxxxxxx>
- To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 9 Aug 2002 08:08:49 +0100
Hi all, have just subscribed and would greatly appreciate your advice on
the following.
We are currently utilising a linescan camera to upload data in RS422 @
20MHz to a host PC. I haven't alot of information on the interconnect cable
except that its 32 pairs of twisted pair in a Shielded cable running a
length of 15 metres. We are having ongoing problems with signal integrity,
manifesting itself as crosstalk, resulting in noisy images being
transferred. The camera is available with an LVDS option as well. Given the
obvious speed advantages of LVDS, and low levels of transmission, are there
any downsides to running LVDS over such a distance.We are endeavouring to
re-layout the RS422 receiving(Host) end and adopt hight speed layout
techniques which may be a source of a lot of our current problems, but am
wondering if LVDS technology will improve things further -it will obviously
tighten up propagation delays and allow a greater timing margin on the
receiver side.
Thanks in advance
Pauric Hennessy
Design Engineer,
Vigitek LTD.,
Limerick
Ireland
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