Does volume control setting affect THD+N ?

Question I have tried to find some information about the volume control in this circuit. How it is made. Is it a digital shift of the signal or does it work without reducing the S/N level? My question is: Does the volume setting influence on the THD+N specification? Answer The volume in the AD1955 is linear. It is the same as described on page 9 of the AD1853 data sheet. I have confirmed with our factory audio converter applications engineers that the THD+N is not measurably affected ( it will be only a 3rd order effect). In the AD1955 it is a digital scaler and would have a similar effect on S/N as a traditional potentiometer volume control. The main contributor to the THD+N is in fact the actual DAC section of the AD1955 (rather than the interfaces and the "bells and whistles").

AD1955: Independency of the channels

Question I have a question about AD1955 Stereo D/A converters. I am wondering that if we are able to use the left and right channels of this DAC as if they are indepent channels. That is, can we say that we have a single chip having two independent DACs for different purposes (dual output DAC)? Answer No, this is not possible. The left and right channels are not totally independent and AD1955 can not be used as a standard 2 channel DAC. This device can be used in stereo or in mono mode. To switch to mono mode, the 2 outputs should be cross coupled as shown in fig 12. The DAC is then is set to Mono Mode, Left or Right channel, using bits 11:10 in DAC Control Register 0. The chip sends the selected channel to the left output straight and to the right channel inverted. The user does not have to do anything to the incoming stereo data.

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AD1955 Production
The AD1955 is a complete, high performance, single chip stereo digital audio playback system comprised of a multi-bit sigma-delta modulator, digital interpolation...
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AD1955 on Analog.com

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- Does volume control setting affect THD+N ?
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