I'd like to ask if there is a typo for the S/(N+D) spec in the datasheet of the AD7661 ADC ?
In Table 2, the typical value is 89.3 dB for -0.5 dBFS while the typical value is 30 dB for -60 dB input.
However, in Fig. 16, the S/(N+D) value is shown to be almost constant down to -60 dB input.
If I'm not misreading the datasheet, can someone tell me which value is actually correct ?