Was hoping the OP would reply with iPhone or Android/Other before I replied. But........
Anyway, I have no idea for an Android phone. However, for an iPhone, I know you can get a bit-perfect digital output from the iPhone, without it going through the DAC. Apple pretty much controls everything iPhone and I believe that originally you had to use a product licensed by Apple to get bit-perfect output. One such device was the Nuforce Icon iDo. I have one of these and it works perfectly with both a late Gen-x iPod/iPhone the used the 30 pin cable. It also works with later Gen iPod/iPhones that use the Lightning cable. It takes a bit perfect digital stream from the iPod/iPhone and sends it through a box that have a volume control, DAC and analog outputs. It also has a coax and optical digital output that can go to a DAC and outputs the bit-perfect digital stream. Works great.
I think you can now output bit-perfect digital from a late generation iPod/iPhone (w/lighting cable) using Apple's "Camera Kit". It's a lightning to USB cable that I believe outputs bit-perfect digital stream from the iPod/iPhone.
I would recommend you go over to Computeraudiophile and do a search on Apple Camera Kit and see what they say. I think the camera kit will output bit-perfect digital from the iPhone.
Sorry, I don't know how to do it with Android.....
