[SI-LIST] Re: LVDS Transmission Problem

Baris,
Your data rate is quite low, so I do not suspect ISI.  More than likely, 
your issues arise from standing waves in the transmission line, and/or 
excessive DC offset between the chassis'.  For a sizeable cable, even mode 
termination is pretty much a must.  If you exceed the CM range of the 
receiver life will be bad.

Steve.
At 03:32 PM 9/27/2005 +0300, Baris Duzgun wrote:
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>From: "Baris Duzgun" <bduzgun@xxxxxxxxxxxxxxxxxxx>
>To: <si-list@xxxxxxxxxxxxx>
>Subject: LVDS Transmission Problem
>Date: Tue, 27 Sep 2005 15:32:48 +0300
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>Hi
>
>
>
>We have a system which is build up two subsytem. Data signals between the
>subsystems are in LVDS format. Between these two subsystems there is 10m
>cable. LVDS data signals are carried using shielded twisted pair cables.
>Inside these two subsystem LVDS signals also passed through backplanes and
>flexes . We use national LVDS transmitter and receiver. (DS90LV032ATM &
>DS90LV031ATM) . The data rate of the LVDS signals are 34MHz. The problem is
>for some data patterns the transmitted and received data is not same?  As
>the  cable length is shortened to 3m and frequency of LVDS signals is
>reduced the problem somewhat lowered but we have still the problem. What
>could be the reasons for this problem?
>
>
>
>  <mailto:r@xxxxxxxxxxxxxxxxxxx>
>
>M.Baris DUZGUN
>
>Hardware Senior Expert Engineer
>
>ASELSAN INC. MGEO Division
>
>P.K. 30 06011
>
>Etlik ANKARA
>
>TURKEY
>
>Tel : +90 312 847 53 00 / 4534
>
>Fax : +90 312 847 53 20
>
>e-mail : bduzgun@xxxxxxxxxxxxxxxxxxx <mailto:bduzgunr@xxxxxxxxxxxxxxxxxxx>
>
>
>
>
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>
>Hi
>
>
>
>We have a system which is build up two subsytem. Data = signals between 
>the subsystems are in LVDS format. Between these two subsystems = there is 
>10m cable. LVDS data signals are carried using shielded twisted pair = 
>cables. Inside these two subsystem LVDS signals also passed through 
>backplanes = and flexes . We use national LVDS transmitter and receiver. 
>(DS90LV032ATM & DS90LV031ATM) . The data rate of the LVDS signals are 
>34MHz. The problem = is for some data patterns the transmitted and 
>received data is not same?  = As the  cable length is shortened to 3m and 
>frequency of LVDS signals is reduced the = problem somewhat lowered but we 
>have still the problem. What could be the = reasons for this problem?
>
>
>
>=
>
>M.Baris = DUZGUN
>
>Hardware Senior = Expert Engineer
>
>ASELSAN INC. MGEO = Division
>
>P.K. 30 = 06011
>
>Etlik = ANKARA
>
>TURKEY
>=
>
>Tel : +90 312 847 53 00 / = 4534
>
>Fax : +90 312 847 53 = 20
>
>e-mail : bduzgun@xxxxxxxxxxxxxxxxxxx
>
>
>
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