CS5101A datasheet(25/40 Pages) CIRRUS

25 / 40 page

code with more or less occurrences than average

will appear as a DNL of greater or less than zero

LSB. A missing code has zero occurrences, and

will appear as a DNL of -1 LSB.

Figures 15 and 16 illustrate the code width distri-

bution of the DNL plots shown in Figures 11 and

13 respectively. The DNL error distribution plots

indicate that the CS5101A and CS5102A cali-

brate the majority of their codes to tighter

tolerance than the DNL plots in Figures 11 and

13 appear to indicate.

FFT Tests and Windowing

In the factory, the CS5101A and CS5102A are

tested using Fast Fourier Transform (FFT) tech-

niques to analyze the converters’ dynamic

performance. A pure sinewave is applied to the

device, and a "time record" of 1024 samples is

-0.65

-0.55 -0.45 -0.35 -0.25 -0.15 -0.05 0 0.05 0.15 0.25

0.35 0.45 0.55

0.65

115

481

3708

15570

25248

15499

3959

714

175

DNL Error in LSB

# of Missing Codes: 0

Total # of

Codes Analyzed: 65534

Figure 15. CS5101A DNL Error Distribution

-0.45

-0.35

-0.25

-0.15

-0.05 0 0.05

0.15

0.25

0.35

0.45

1775

16047

31047

14592

1892

DNL Error in LSB

# of Missing Codes: 0

Total # of

Codes Analyzed: 65534

Figure 16. CS5102A DNL Error Distribution

CS5101A CS5102A

DS45F2

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