Pseudo-differential DAC output to single ended
The CS43198_F1 data sheet has a certain vague section called Analogue Signal Conditioning on page 10 with a dashed outline that could shed light on the application if the details of how the REFA and REFB pins were connected through were shown. 

The CS4353_F3 data sheet hints on page 12 with a similarly positioned and shaded section that the AOUT_REF pin is directly connected to the headphone ground. 

Both datasheets do show ground connections at the headphone jack.  The question is must this ground be floating (is it even ESD safe to propose such a thing) or can it be tied to some local ground.

The second datasheet on page 13 makes a strong case for the use of the AOUT_REF being rather flexible including connecting it to a local ground point.  If one can extrapolate the functionality from a single to a double reference pin and assume Cirrus Logic means the same thing in both products with their term Pseudo differential then we might be forgiven for thinking that single ended operation is quite possible.