The Octopre ADC specs are:

• 0dBFs = +22dBu
• S/N = -109dBfs measured with A-weighting filter at 48Khz sample frequency.
• THD = <0.003% at 0dBfs with 1KHz signal measured with 20Hz/22Khz band pass filter.
• A/D Clock Jitter = 200 pico seconds measured using 700Hz to 100kHz bandpass filter.
• External wordclock jitter = <2 nano seconds measured using 700Hz to 100kHz bandpass filter.