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Hi Sebastian,
Let me look into this reference design a little for you, I'm curious to see what the outcome is without using the OPAs and INAs:
TIDA-01576 — High accuracy analog input module reference design with 16-bit 1-MSPS dual simultaneous-sampling…
Part Number: ADS8688A Other Parts Discussed in Thread: TIDA-01576 , ADS8688 Didn't know how to address this but in the current datasheet between figures on pg.3 under Section 6 - "Pin Configuration and Functions" and pg.71 figure 128, pins 3 and 4 are flipped…