Is AD9746 monotonic?

Question

I'm interested in using the AD9746 (14bit DAC) for a new design, but I need a DAC whose output is monotonic. The datasheet has the typical DNL as 0.5, but does not specify a max DNL or show a plot of the DNL. Is this part monotonic? Is there a spec for the max DNL or a plot of the DNL over the full range? 
 
 Thanks, 
 
 Ben

JMMina · Accepted Answer

Yes, all the generics in this device family are monotonic. Typical High-speed CMOS devices like this use a current-steering DAC architecture (2 differential outputs IOUTP and IOUTN), which makes the DAC by design inherently monotonic. The &plusmn;2.0 LSB DNL for AD9747 does not cause non-monotonicity, it just means less optimal linearity values. The DAC will be non-monotonic if the DNL is less than &ndash;1 LSB at any transition (i.e. its transfer characteristic contains one or more localized maxima or minima). 
 Regards, 
 Marco)

JMMina · Answer

Hi Ben3 , 
 The AD9746 DAC is inherently monotonic by design. They are guaranteed to be monotonic once they're released to the market. There's no INL/DNL graph for AD9746, only the typical values found in Table 2. 
 
 Regards, Marco

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Is AD9746 monotonic?