ADuM2401 output driving 2m cable

Document created by analog-archivist Employee on Feb 23, 2016
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I have to drive a long cable (about 2m) with the ADuM2401 output  signals,
synchronuos transmission and low speed (1Kb/s); any driving problems (cable
capacitance, current, ringing,...) ? Any suggestions  ?

 

The maximum recommended output capacitance is 15 pF  (a typical 2m cable might
have a capacitance of 200 pF). The part can actually source a decent DC load,
so higher capacitance at very low data rates might be OK. However the output
edge rates are relatively fast (2-3 ns) so there would likely be reflections.

You may want to consider an interface device specifically designed to drive
cables.

Please also have a look into the following documentation :
http://www.analog.com/en/interface-isolation/lvds/products/index.html#LVDS_Drive
rs-Receivers
http://www.analog.com/static/imported-files/application_notes/AN-1177.pdf
http://www.analog.com/static/imported-files/circuit_notes/CN0256.pdf

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