12 frequency domain information, 1 frequency, 2 magnitude – Cirrus Logic CDB5464U User Manual

Page 24: 3 s/pn, 4 sinad, 5 s/d, Figure 15. fft, Cdb5464u

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CDB5464U

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).