CS5317 datasheet(16/32 Pages) CIRRUS

16 / 32 page

Full - scale signal - to - noise - plus - distortion

[S/(N+D)] is calculated as the ratio of the rms

power of the fundamental to the sum of the rms

power of the FFT’s other frequency bins, which

include both noise and distortion. For the

CS5317, signal-to-noise-plus-distortion is shown

to be better than 81 dB for an input frequency

range of 0 to 9.6 kHz (fs/2).

Harmonic distortion characteristics of the CS5317

are excellent at 80 dB full scale signal to THD

(typical), as are intermodulation distortion char-

acteristics, shown in Figure 8. Intermodulation

distortion results from the modulation distortion

of two or more input frequencies by a non-linear

transfer function.

DNL Test

Figure 9 shows a plot of the typical differential

non-linearity (DNL) of the CS5317. This test is

done by taking a large number of conversion re-

sults, and counting the occurrences of each code.

A perfect A/D converter would have all codes of

equal size and therefore equal numbers of occur-

rences. In the DNL test, a code with the average

number of occurrences is considered ideal and

plotted as DNL = 0 LSB. A code with more or

less occurrences than average will appear as a

DNL of greater than or less than zero. A missing

code has zero occurrences, and will appear as a

DNL of -1 LSB.

The plot below illustrates the typical DNL per-

formance of the CS5317, and clearly shows the

part easily achieves no missing codes.

Signal

Amplitude

Relative to

Full Scale

Input Frequency (Hz)

S/I.M.D.: 84.7 dB

0dB

-20dB

-40dB

-60dB

-80dB

-100dB

-120dB

800

1450

9600

Figure 9. CS5317 DNL Plot

Figure 8. CS5317 Intermodulation Distortion

65,535

Codes

32,768

-1

+1/2

-1/2

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CS5317

DS27F4

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