This is really hard to find and the first time I bought a dac I ended buy the wrong one.
This dac has a 3.5mm input and output for both sides of the dac. But finally I found a dac that not only give great output, but is is actually usual able.
YSTech: http://ystech.org
YSTech Link: http://ystech.org/unnlink-dac-unboxing
Unnlink Dac:
UnnLink Dac Review
-YS