Cirrus-logic CDB5464U Manuel d'utilisateur télécharger pdf (Page 24)

CDB5464U

24 DS847DB1

2.8.12 Frequency Domain Information

The following describe the indicators associated with FFT (Fast Fourier Transform) analysis. FFT data

can be plotted in the Data Collection Window by setting the analysis type selector to FFT (Figure 15).

Figure 15. FFT Analysis

2.8.12.1 FREQUENCY

Displays the x-axis value of the cursor on the FFT display.

2.8.12.2 MAGNITUDE

Displays the y-axis value of the cursor on the FFT display.

2.8.12.3 S/PN

Indicates the signal-to-peak noise ratio (decibels).

2.8.12.4 SINAD

Indicates for the signal-plus-noise-plus-distortion to noise-plus-distortion ratio (decibels).

2.8.12.5 S/D

Indicates for the signal-to-distortion ratio, 4 harmonics are used in the calculations (decibels).

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Cirrus-logic CDB5464U Manuel d'utilisateur Page 24