CDB5471 Datasheet, PDF (20/26 Pages) Cirrus Logic – Evaluation Board and Software

CDB5471
3.2.7.4. Minimum
Indicator for the minimum value of the collected
data set.
3.2.8 Frequency Domain Information
The following section describes the indicators as-
sociated with FFT (Fast-Fourier Transform) analy-
sis. Refer to Figure 8. FFT data can be plotted in
the Data Collection Window by setting the Time
Domain / FFT / Histogram selector button to
“FFT.”
3.2.8.1. Frequency
Displays the x-axis value of the cursor on the FFT
display.
3.2.8.2. Magnitude
Displays the y-axis value of the cursor on the FFT
display.
3.2.8.3. S/D
Indicator for the Signal-to-Distortion Ratio, 4 har-
monics are used in the calculations (decibels).
3.2.8.4. SINAD
Indicator for the Signal-to-Noise + Distortion Ratio
(decibels).
3.2.8.5. SNR
Indicator for the Signal-to-Noise Ratio, first 4 har-
monics are note included (decibels).
3.2.8.6. S/PN
Indicator for the Signal-to-Peak Noise Ratio (deci-
bels).
3.2.8.7. FS-PdB
Not using windowing, how far down from zero the
peak voltage input value is (decibels).
Figure 8. Data Collection Window (FFT)
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DS480DB1