Cirrus-logic CS5560 Manuale Utente Scaricare il pdf (Pagina 22)

CS5560

22 DS713PP2

5/4/09

Figure 17 illustrates the noise floor of the converter from 0.1 Hz to 25 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 16 illustrates a noise histogram of 32,768 samples.

-180

-160

-140

-120

-100

-80

-60

0.1 1 10 100 1k 10k

25k

Frequency (Hz)

Shorted Input

1M Samples @ 50 kSps

64 Averages

Figure 17. Spectral Plot of Noise with Shorted Input

100

200

300

400

500

600

700

800

Output (Codes)

Std. Dev. = 19.0

Max - Min = 178

Figure 18. Noise Histogram (32k Samples)

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

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Cirrus-logic CS5560 Manuale Utente Pagina 22