ADS8168EVM-PDK Operation
18
SBAU291 – November 2017
Copyright © 2017, Texas Instruments Incorporated
ADS8168EVM-PDK
6.3
Spectral Analysis Tool
The spectral analysis tool is intended to evaluate the dynamic performance (SNR, THD, SFDR, SINAD,
and ENOB) of ADS8168 SAR ADC through single-tone sinusoidal signal FFT analysis using the 7-term
Blackman-Harris window setting.
For dynamic performance evaluation, the external differential source must have better specifications than
the ADS8168 itself to ensure that the measured system performance is not limited by the performance of
the signal source. Therefore, the external reference source must meet the source requirements mentioned
in
Table 5. External Source Requirements for Evaluation of the ADS8168
Specification Description
Specification Value
Signal frequency
2 kHz
External source type
Single ended
External source common-mode
Vref/2, nominally 2.048 V
Maximum noise
14.5 µV
RMS
Minimum SNR
100 dB
Maximum THD
–110 dB
Figure 14. Spectral Analysis Tool
