>From the Stereophile article, it seemed they used a spectrum plot to estimate the jitter value and this would roughly be the cumulative jitter over some unspecified interval. Estimating this from the analog output could add the DACs errors into the jitter value. Actually measuring the cumulative jitter on the data edges, you actually can see the effects of poor oscillator power supply filtering when using a SMPS. Attached is one example which the 33MHz from the PCI bus was one key source of jitter, but there are other cases where the 150kHz of the SMPS was obvious.
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