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Combining two DAC to double resolution (AD5439 or ?)

Question asked by Cat on Jul 12, 2013
Latest reply on Jul 15, 2013 by EstiS

I am unable to find a 20 bit DAC that's small enough, daisy-chaineable, with single supply, etc.

I'm thinking of using two 10 bit DACs and add their outputs with the right weighting (1:1024).

I think I know how to do this with voltage output DACs but am unsure how I can do it with the AD5439, mainly because it has the feedback resistor output and I don't know what to do with it when summing currents.

If there was one output outputting the current I could just connect them in the feedback loop resistors of the output Current to Voltage converter.

 

My space is very limited; I hardly have space for ONE external OpAmp and 3 resistors so I'm not looking for "by the book" solutions.

 

Alternatively, are there any SMALL 10-12 bit, Buffered Voltage Output, daisy-chaineable, external reference, single supply (~5V) DACs?

Ideally pins would be: V+, GND, Data In, Data Out, CLK, REF, Out.

 

Thanks,

 

Cat

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