You use this out of your lightning port to your DAC's USB cord:
Amazon.com: Apple Lightning to USB3 Camera Adapter
This will let you charge and listen to up to 24/192 at the same time (or above if your DAC will handle that). It works on both iPhone and iPad but is big and clunky so best for non-mobile applications.
Amazon.com: Apple Lightning to USB3 Camera Adapter
This will let you charge and listen to up to 24/192 at the same time (or above if your DAC will handle that). It works on both iPhone and iPad but is big and clunky so best for non-mobile applications.