It uses the CS8414 Digital Receiver, CS website says reduces jitter to about 200 ps, that's if it's implemented well. Lavry wrote very nice postings in his sponsor forum that explains the impact of jitter, 200 ps maybe a lot when there are other alternatives reducing it to 50 or altogether like the Sabre DAC.
The DAC is the Burr Brown PCM1716E. It's a regular sigma delta 24/96 capable DAC. Can read up on more from DIY forums, every posting I read said, nothing interesting or spectacular.
The USB interface is the PCM2902. Seems to be USB input with SPDIF output, but I am not sure. I know the PCM2707 that other DACs use for usb input are converted via I2S instead. Guessing they do it this way for a reason, instead of using the 2902.
I wish I knew what OpAmp it used for the headphone output. Here is a picture of one of the 2 used. Maybe someone can help you out. But looks to me you can switch them out for something else.