CDB5460A Datasheet, PDF (19/28 Pages) Cirrus Logic – Evaluation Board and Software

CDB5460A
2.13.4 MEAN
Indicator for the mean of the data sample set. The
mean is calculated using the following formula:
Mean =
n-1
Σ ^Xi
i=0
n
2.13.5 MINIMUM
Indicator for the minimum value of the collected
data set.
2.13.6 STD. DEV.
Indicator for the Standard Deviation of the collect-
ed data set. The Standard Deviation is calculated us-
ing the following formula
StDev =
n-1
Σ ^{(Xi - Mean)2}
i=0
n
2.13.7 VARIANCE
Indicates the Variance for the current data set. The
variance is calculated using the following formula:
Var =
n-1
Σ ^{(Xi - Mean)2}
i=0
n
2.14 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 Time Domain / FFT / Histogram selec-
tor to FFT (Figure 7).
2.14.1 FREQUENCY
Displays the x-axis value of the cursor on the FFT
display.
2.14.2 MAGNITUDE
Displays the y-axis value of the cursor on the FFT
display.
2.14.3 S/D
Indicator for the Signal-to-Distortion Ratio, 4 har-
monics are used in the calculations (decibels).
2.14.4 S/N+D
Indicator for the Signal-to-Noise + Distortion Ratio
(decibels).
2.14.5 SNR
Indicator for the Signal-to-Noise Ratio, first 4 har-
monics are not included (decibels).
2.14.6 S/PN
Indicator for the Signal-to-Peak Noise Ratio (deci-
bels).
2.14.7 # of AVG
Displays the number of FFT’s averaged in the cur-
rent display.
2.15 Time Domain Information
The following controls and indicators are associat-
ed with Time Domain Analysis. Time domain data
can be plotted in the Data Collection Window by set-
ting the Time Domain / FFT / Histogram selector to
Time Domain (Figure 6).
2.15.1 COUNT
Displays current x-position of the cursor on the
time domain display.
2.15.2 MAGNITUDE
Displays current y-position of the cursor on the
time domain display.
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