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TAS5760MD: THD+N & External I2S Problem

Part Number: TAS5760MD
Other Parts Discussed in Thread: TAS5760XXEVM,

Hi Dear TI members,

I just trying to test TAS5760xxEVM and using the Pure Path Console Mother Board,  and i just found some problems, please referred the below, thanks.

1. According to  the TAS5760MD spec, at PVDD is 24V, load is 8ohm, using SW control the typical value of the THD+N is about 0.04% at 1W output, but from the "typical characteristics" waveform, the measurement result is about 0.018%, so what`s wrong about the difference? Chip variation? Or?........... So which spec can let me reference?  

2. Currently, my Pure Path Console Mother Board version is F, so how to directly use the external PSIA I2S signal from the Audio Precision? Currently, the Optical and Coaxial input signal is not for using to test.

So appreciate for the answer

Best regards