After all software fixes, some CX31993 dongles are simply defective due to:
Based on reliable retailer and community data, here are the verified specifications to "fix" or complete your datasheet: Resolution & Sample Rate 32-bit / 384kHz Signal-to-Noise Ratio (SNR) (often cited as -128dB). Dynamic Range (DNR) Total Harmonic Distortion + Noise (THD+N) (approx. 0.0017%). Output Power into 32Ω. Output Voltage (standard) to (when paired with external op-amps like the MAX97220). Output Impedance (Standard implementations are often around 0.5Ω). Power Consumption : Low power; roughly during playback. Functionality : Supports inline microphones and volume controls. Audio Science Review (ASR) Forum Common Issues and "Fixes" Cx31993 Datasheet Fix