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TAS5731M: IDF post scale register

Part Number: TAS5731M
Other Parts Discussed in Thread: TAS5753MD

Hi,

What is IDF? What is purpose of IDF post scale register?
I think that IDF post scale register may be out of DAP Process Structure, because there is not 0x62 address in Figure 45.
Does 'SRC' or '4th-Order Noise Shaper and PWM' block of Fig.43 have a IDF?
If this register value needs not change, I hope the datasheet will describe this as a reserved register and remove the word of IDF.

Best regards,

Akio Ito