I am designing a front end for an Audio A2D who required differential input from a single ended source, I am considering 2 approach for the front end :
the first approach is to use a discrete 3 OP-AMP who convert a single ended (audio source) into a differential signal required by the A2D
The 2nd approach is to use one fully differential OP-AMP like the AD8138 using the as an input and the(-) connected to GND.
Both design is powered by +/- 15V and 2.5V reference
Please help me to choose the best approach from the S/N and quality point of view.