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Old January 21st, 2005, 07:59 AM   #11
Tom Jenkins
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Join Date: Apr 2002
Location: Milwaukee, WI
Posts: 6,032
It's not elegant, but I use a simple trick to remember how they work.

"Sink" means that the device, be it an input or an output, lets the current sink or disappear into it, implying that the power source is external. In the case of an analog output device that means it adjusts its internal impedence until the current passing through is the desired value.

"Source" means that the device is the source of the power and the current. That means that an analog output device adjusts the current it is producing until is is the desired value.
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