Cirrus-logic CS5581 Bedienungsanleitung PDF herunterladen (Seite 22)

CS5581

22 DS796PP1

3/25/08

14:34

Figure 16 illustrates the noise floor of the converter from 0.1 Hz to 100 kHz. While the plot does exhibit

some 1/f noise at lower frequencies, the noise floor is entirely free of spurious frequency content due to

digital activity inside the chip.

Figure 17 illustrates a noise histogram of 4096 samples.

-160

-140

-120

-100

-80

-60

-40

-20

0.1 1 10 100 1k 10k

100k

Frequency (Hz)

Shorted Input

2M Samples @ 200 kSps

16 Averages

Figure 16. Spectral Plot of Noise with Shorted Input

100

200

300

400

500

600

700

800

900

-8-7-6-5-4-3-2-1012345678

Mean = -0.61

Std. Dev = 2.33

Output (Codes)

Figure 17. Noise Histogram (4096 Conversions)

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 31 32

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Cirrus-logic CS5581 Bedienungsanleitung Seite 22