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While Sinking and Sourcing is primarily used for digital modules, the same concept can be applied to analog modules.For example, the NI-9266 Datasheet contains the figure below. The figure below shows that the current flows from the Vsup pin connected to the external power supply to the AO pin. Additionally, from the datasheet we can see that the current range of the NI-9266 is from 0 mA to 20 mA. With these two pieces of information, we know that the NI-9266 can only source current, it cannot sink current from its Analog Out pins.
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