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What is the AD5391-3 Channel Output Voltage?

Question asked by dougcl on Jun 16, 2018
Latest reply on Jun 22, 2018 by dougcl

I can't believe I have to ask this here, but I can't seem to make sense of the datasheet. 

 

On page 8 in the spec table, it says 0/AVDD (which is what I want)

On page 23 it says VOUT=(2)(VREF)(x2/2^n) which gives 2.5V at x2=4095 because VREF is 1.25V

 

 

My AVDD is 3.3V. What do I need to do to get 0/3.3V out of the channels? Is it even possible?

 

Is the idea that you run a 2.5V internal VREF and then use the gain trim to scale it down to AVDD? Or is an external VREF at 1.65V the way? Sheesh.

 

Thanks
Doug

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