Once the bugs are fixed, how do you make the CX31993 sound better than a $200 portable DAC?
Always pull I²C lines high (2.2kΩ to 3.3V) even if you don’t use it. The chip floats otherwise. cx31993 datasheet fix better
| Register | Function | Useful values | |----------|----------|----------------| | 0x03 | HP amp gain | 0x00 = -6dB, 0x02 = 0dB, 0x03 = +6dB | | 0x06 | Mixer control | Bit 3 = HP enable | | 0x0A | LED/GPIO | 0x01 = LED on | | 0x10 | PLL config | Default 0x88 for 44.1/48kHz | Once the bugs are fixed, how do you
Addressing Deficiencies in the CX31993 Datasheet: A Case for a Complete Public Technical Reference | Register | Function | Useful values |
| Feature | CX31993 (Fixed) | Apple A2049 (C100) | Realtek ALC5686 | | :--- | :--- | :--- | :--- | | | 32-bit | 24-bit | 32-bit | | Max Sample Rate | 384kHz | 48kHz (locked) | 384kHz | | Output Impedance | ~2Ω (very good) | ~0.9Ω (better) | ~10Ω (worse) | | Power Draw | 35mA (fixed) | 25mA | 45mA |
No. The CX31993 uses the standard USB Audio Class 2.0 driver built into Windows, macOS, Linux, Android, and iOS. If a device fails to recognize it, the issue is a hardware USB handshake failure or a damaged cable, not a missing driver.
Note: A "better" community firmware exists that disables the LED blink on sample rate change, saving 5mA of power.