I see the DNL
The data from **broken link removed** **broken link removed**
and he say
Differential Nonlinearity (DNL) is a measure of the separation between adjacent levels
measured at each vertical step (% or LSB).
DNL = (Dcx - 1) LSBs
where Dcx is the size of the actual vertical step in LSBs.
but I see the other image is different
It like this
I confused with it's one of horizontal and the other is vertical
which is right?
DNL should be related to the analog input signal for ADC and analog output signal for DAC. That is why DNL can be a factional number (like 0.7LSB). Therefore, you should use the second plot.
there are two different defination of DNL;
one is define the max (step size - 1LSB) as the DNL of the circuit
the other is give every setp the defination of DNL as (step size -1LSB )
There are not two definitions, it is only one, the second. The other one is called Maximum DNL. It is true though that people forget sometimes to put maximum in front when they characterize chips (in datasheets).
both ways are ok to quntify DNL. Only diffrence is that in first plot you can quantify only discreet levels. where as in second you can quntify the fractional DNL also. Now choice is yours i prefer second one.