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AD7634 - Histograms near the extremity of the scale

Question asked by ito.rafael on Nov 16, 2016
Latest reply on Nov 16, 2016 by Gnib

Hi,

 

I'm currently working with the AD7634 and I have a question about the thickness of the histogram when working at the extremity of the scale.

 

Looking at the figure 7 of the datasheet (page 12), attached to this message, it is possible to see that the histogram shows a thickness of 7 (min: 0x20000 and max: 0x20006) and a standard deviation of 0.80. If we look at the figure 10 we can also see a thickness of 7 (min: 0x1FFFE and max: 0x20004), but a standard deviation of 0.75.

 

But for both histograms the measure was acquired at the center of the scale, i.e., near the code 0x20000 and I didn't find in the datasheet further details about the results when working outside of the center of the scale.

 

This way, I'd like to know what I should expect in terms of thickness of the histogram and standard deviation, when working near the codes 0x00000 and 0x3FFFF.

 

Another doubt: the description of both figures 7 and 10 says "Histogram of 261,120 Conversions of a DC Input...", but when I sum all of the counts of the histogram the result is 131,072. This way, I would like to know what this "261,120 Convertions" means.

 

Thanks in advance.

Best regards,

 

Rafael Ito

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