Fft Analysis - Texas Instruments ADS86 EVM-PDK Series User Manual

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7.5.2

FFT Analysis

The FFT analysis page in the GUI performs the fast fourier transform (FFT) of the captured data and
displays the resulting frequency domain plots. This page also calculates key ADC dynamic performance
parameters, such as signal-to-noise ratio (SNR), total harmonic distortion (THD), signal-to-noise and
distortion ratio (SINAD), and spurious-free dynamic range (SFDR).
analysis display. The input channel (AINx) for FFT analysis can be selected from the channel drop-down
menu and the data capture settings can be entered in boxes on the left side of the graph. The FFT
calculated parameters are shown on the bottom side of the graph.
Input signal frequency for FFT analysis:
• The GUI analyses the FFT to provide signal power (dBFs), SNR, SINAD, THD, SFDR, and ENOB
numbers.
• The GUI uses a 7-term Blackman-Harris window to minimize spectral leakage.
SBAU245A – June 2015 – Revised July 2015
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Figure 26. FFT Analysis
Copyright © 2015, Texas Instruments Incorporated
ADS86xxEVM-PDK Kit Operation
Figure 26 shows the FFT performance
ADS86xxEVM-PDK Evaluation Module
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