Does the ADA8824 (ADAT) 24-bit Eight Channel A/D-D/A Converter dither?
No, there is no dithering on either the AES3, S/PDIF or ADAT digital outputs. It is recommended that dithering be performed (by external equipment) subsequent to bit depth reduction. In practice, truncating to 20-bits produces very low levels (<114dBFS) of truncation distortion, which is beyond the SNR of the converters, and can often be performed without audibility. Truncation to 16-bits can product audible distortion, and is not recommended.