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RE: Capacitance question on JR CC89259/1506A IC

Posted by Jon Risch (B) on August 16, 2007 at 10:36:05

In Reply to: Capacitance question on JR CC89259/1506A IC posted by marchewd on August 16, 2007 at 09:50:01:

It depends on the actual spacing of the shield, and whether or not the filler pieces are put in, etc.

What I would consider a properly constructed cable, with shield ground as per my recommendations, runs approx. 17-20 pF per foot. If you skimp on the spacer material, etc., then it could run as high as 30-34 pF per foot. due to the closer proximity of the shield.

A naked twisted pair can be as low as 12-14 pF per foot, without any shielding present, and laid out in open air away from metallic objects.

Jon Risch

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