TPA3255: DC-coupling into TPA3255 – input CM level?

Tool/software:

Hi TI,

I’d like to DC-couple a PCM1795 (diff I/V with OPA1632) into TPA3255 (no input coupling caps).

Plan: set VOCM ≈ AVDD/2, derived from AVDD via thin-film divider → OPA1642 buffer → 49 Ω → OPA1632 VOCM. TPA inputs then see ~AVDD/2 CM, ~0 V diff DC. 

Questions:

1. What DC input CM do you recommend at INPx/INNx when DC-coupled? Is AVDD/2 correct, and what tolerance band is safe?

2. I see the issues with this approach when using PFFB (vs the traditional AC-coupled input), any ideas on how to mitigate that?

3. If DC-coupling is not recommended, what specific capacitor series/parts do you suggest for best performance and availability  given many “audio-grade” electrolytics are discontinued?

Thanks!