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LME49710 vs LME49990

For our audio ADC modules, we will need to decide between the LME49710 and the LME49990. When coupled with the AK5397 ADC, the former will give us an SNR of 124 dB and an S/(N+D) of 108 dB, while the latter will give us a better SNR of 127 dB, but a much lower S/(N+D) of 100 dB. My hunch tells me that SNR matters more than S/(N+D), but I’m not entirely sure. One benefit of having our ADC modules on small SO-DIMM boards is that it should be fairly cost effective to try and compare both options.

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