how does the FPGA control and correct the R2R ladder?
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I think Halo or someone does something similar, some sort of feedback correction to get accurate resistor tolerances. Just noticed it has a TCXO (temperature controlled) clock as well, with (PCM / DXD / DSD Native support.
Being done by Audio GD it could be one to look out for for doing RedBook pcm, certainly priced right at $2.5k. Shipping prices from these guys are always cheap.