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ad5781, +- 10v output options

Question asked by andrewm on Aug 4, 2016
Latest reply on Aug 10, 2016 by msamera

Seems I have two options to generate a +- 10 volts from the AD5781B 18 bit DAC.

 

a) Feed +- 10 v ref into the ref inputs, and us the adc unity gain, preferably with the input bias current compensation

             as per data sheet fig 52.

or

 

b) feed VrefP with +10v, VrefN with 0v, and us the times two option. , as per CN-0177 fig 1.

 

In terms of components, they seem similar,

 

Any thoughts on which would give the least output noise and most accuracy / lowest temperature drift ?

 

My 'guess' is option (b) ,

 

Thanks

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