CS5571 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CS5571' PDF : 32 Pages View PDF
3/25/08
10:56
CS5571
Figure 18 illustrates a test signal of 5.55 kHz, 116.3 dB down, which is only 6.3 microvolts peak to peak,
or about 1/10 of a code width. The converter can reliably digitize this signal because of its excellent DNL
and proper dither.
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Frequency (Hz)
Figure 18. Spectral Performance, -116.3 dB
Dither On
Figure 19 is a spectral plot of the converter with its input grounded. The spectral information is on a log-
arithmic frequency axis as this illustrates the very low frequency behavior of the converter. Figure 19 was
produced from averaging the results of 16 FFT outputs using 2 million samples each. This plot also illus-
trates that the converter noise floor is free of spurious components that may be present in other converters
due to on-chip digital interference.
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0.1
Shorted Input
2M Samples @ 100 kSps
16 Averages
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10
100
1k
Frequency (Hz)
Figure 19. Spectral Plot of Noise with Shorted Input
10k
50k
DS768PP1
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