sounds quieter on Android compared to PCs. This is usually due to the Android system's internal volume mixer capping the output to protect your hearing. Use a "Bit-Perfect" music player like USB Audio Player Pro (UAPP)

The CX31993 is capable of and 0.002% THD+N —but the datasheet hides that behind sparse documentation. Apply these fixes and you’ll outperform many off-the-shelf dongles.

It is highly probable that is a misinterpretation of CS51983 or a confusion with Cortex-M3 part numbers (which often follow similar naming conventions).