wait to burn-in
I think i will try Sparkos Labs discrete opamps in I/V stage.... with a good linear psu.
Yes, linear psu changes the game.
Other than that, analog part of ES9018K2M is powered some how not so good.
For example, Vref (I/V), AVCC_L (15), AVCC_R (16) & VCCA (17) are powered from single psu (3.3v). This is cheap enough, but is not good at all. So, I'm planing to build 3 more low noise linear psu (LP5907).
SPSU (1v) is powering XMOS. All in all a bit crazy
This is the price for ability to power all hardware by USB.
About OP amps...
Keep in mind that I/V stage needs fast OP amps (LME 49720 is good, but not fast enough - Gain Bandwidth 55MHz), so Sparkos are may be good for LPF, but not I/V (IMHO).
According Application Note Component Selection and PCB Layout (ESS), best OP amp for I/V is AD797 (LME49990 IMHO).