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It was last year, I've got an idea to add to a DAC THD analyzer working on the same principle as APx555(analog notch filter +DSP and some "photoshop" to turn notched FFT plot to a normal view). The very first proto I made was on a mono PCB, and had unsolvable current loops problem(probably 6...

Hi everyone, I keep playing with my proto DAC+HPA project and found abnormally high THD(.002%@1kHz 0..-20db pretty much the same) with SPDIF input and default reg#0 = 0x00 i.e. clk_gear = XI/1. If clk_gear = XI/2 or XI/4 either XI/8 the THD becomes better, and XI/8 THD have the lowest value...