Cx31993 Datasheet | Fix

Ensure you have two separate 5.1kΩ resistors (one on CC1 to GND, one on CC2 to GND). Never tie CC1 and CC2 together to a single resistor.

When a Cx31993 circuit deviates from optimal layout practices, it typically exhibits one of four distinct failure modes:

Example corrections likely needed (concise) Cx31993 Datasheet Fix

Lack of decoupling capacitors near the chip’s power input, leading to USB noise bleeding into the audio signal.

By implementing these hardware modifications and layout guidelines, you can overcome the common limitations of the stock reference designs. This ensures the Conexant Cx31993 operates with the high audio fidelity, low noise floor, and thermal stability it is capable of delivering. To help tailor this technical information, let me know: Ensure you have two separate 5

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| Incorrect Claim | Correct Information | |----------------|----------------------| | Pin 7 = Analog GND | Pin 7 = (headphone detection, active low) | | Pin 11 = VDDIO | Pin 11 = VOUT_REF (common mode reference for output) | | Pin 14 = MIC bias | Pin 14 = VBUS (USB 5V input – shared with pin 13) | | Supports 32-bit/384 kHz natively | Max 32-bit / 384 kHz but only via USB 2.0 HS; many dongles limit to 96 kHz due to crystal choice | This link or copies made by others cannot be deleted

Always connect the DAC directly to the computer to minimize electromagnetic interference (EMI). 2. Tackling Noise/Hiss (The Hardware "Datasheet" Fix)