Spectral Analysis Tool; External Source Requirements For Evaluation Of The Ads8168 - Texas Instruments ADS8168EVM-PDK User Manual

ADS8168EVM-PDK Operation
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.
Table 5. External Source Requirements for Evaluation of the ADS8168
Specification Description
External source common-mode
18
ADS8168EVM-PDK
Signal frequency
External source type
Maximum noise
Minimum SNR
Maximum THD
Figure 14. Spectral Analysis Tool
Copyright © 2017, Texas Instruments Incorporated
Specification Value
2 kHz
Single ended
Vref/2, nominally 2.048 V
14.5 µV
RMS
100 dB
–110 dB
SBAU291 – November 2017
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