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Source impedance of ADuC7060/7061 DAC?

Question asked by Lars on Sep 20, 2011
Latest reply on Sep 26, 2011 by Lars

I am using the DAC on an ADuC7060 to provide a reference voltage for a current source similar to this:

http://www.analog.com/library/analogDialogue/archives/43-09/img15_bb.gif

While the circuit works, in the process it is pulling the voltage on th DAC up to almost 3V which causes all sorts of problems with the ADCs on the ADuC7060.    My question is, what is the source impedance on the DAC (I am using the buffer), so I can figure out how to isolate the DAC from the current source.

 

Thanks,

Lars

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