Cirrus Logic CDB5461AU - Manual (Page 24)

CDB5461AU
24 DS661DB1
2.8.12 Frequency Domain Information
The following describe the indicators associated with FFT (Fast Fourier Transform) analysis. FFT data can be plot-
ted in the Data Collection window by setting the Time Domain / FFT / Histogram selector to FFT (Figure 14).
Figure 14. 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
Indicator for the signal-to-peak noise ratio (decibels).
2.8.12.4 SINAD
Indicator for the signal-plus-noise-plus-distortion to noise-plus-distortion ratio (decibels).
2.8.12.5 S/D
Indicator for the signal-to-distortion ratio, 4 harmonics are used in the calculations (decibels).