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7.4 Frequency-Domain Display
Figure 7-5
shows the spectral analysis tool that evaluates the dynamic performance (SNR, THD, SFDR, SINAD,
and ENOB) of the ADS1258. This dynamic performance is calculated by single-tone sinusoidal signal FFT
analysis using the 7-term Blackman-Harris window setting. The FFT tool includes windowing options that are
required to mitigate the effects of non-coherent sampling (this discussion is beyond the scope of this document).
The 7-term Blackman-Harris window is the default option and has sufficient dynamic range to resolve the
frequency components of a 24-bit ADC. The None option corresponds to not using a window (or using a
rectangular window) and is not recommended.
Figure 7-5. ADS1258EVM GUI Frequency Domain Display Page
SBAU126E – MAY 2007 – REVISED JUNE 2023
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EVM Operation and GUI
ADS1258EVM-PDK Evaluation Module
17
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