4.4 Spectral Analysis
The
Spectral Analysis
tool shown in
is intended to evaluate the dynamic performance (SNR, THD,
SFDR, SINAD, and ENOB) of the ADC through 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
all ADCs included in
. The
None
option corresponds to not using a window (or using a rectangular
window) and is not recommended.
Figure 4-4. Spectral Analysis in the ADS704X-5XEVM GUI
As noted in step 4.a in
, Texas Instruments offers the
as a precision signal generator if
such a source is otherwise unavailable to the user. The PSIEVM can be used to generate clean sinusoidal input
signals for the ADS704X-5XEVM to verify AC performance specifications.
EVM Operation
16
ADS7042EVM-PDK, ADS7049-Q1EVM-PDK, and ADS7057EVM-PDK
Evaluation Module
Copyright © 2021 Texas Instruments Incorporated
