Advanced. Check the box for "Allow applications to take exclusive control of this device" .
: Users frequently report that the CX31993 produces crackling, popping, or choppy sound on laptops, Raspberry Pis, and Android phones. This often indicates a data underrun error, where the USB bus is not delivering data quickly enough.
The CX31993 is a highly popular, low-cost USB Type-C digital-to-analog converter (DAC) chip. It powers countless portable headphone dongles and DIY audio projects. However, engineers and hobbyists frequently run into a major roadblock: errors, omissions, and contradictions in the official CX31993 datasheet. Cx31993 Datasheet Fix
is a "black box" chip—highly capable but poorly documented. For now, the best "datasheet fix" is to lean on the community-driven data from the Framework forums Facebook audio groups
When designing a new revision of a Cx31993 circuit board, adhere to these layout rules to permanently avoid the need for post-production fixes: Requirement / Specification Minimum 4-layer PCB recommended Separates digital signals from analog audio routes Grounding Strategy Split AGND and DGND, joined at a single star point Advanced
Before sending your PCB design to production, verify your implementation against this audited checklist derived from verified working implementations: Target Parameter Factory Datasheet Spec Corrected Production Spec Unspecified Ωcap omega resistors in series with HPL/HPR Microphone Bias (MIC_BIAS) Internal Pull-up Add external 2.2k Ωcap omega pull-up to AVDDcap A sub cap V cap D cap D end-sub for stability Clock Source Internal RC Oscillator External 24MHz Crystal (10ppm) for low jitter USB Resistors No external pull-downs Ωcap omega pull-downs on CC1/CC2 for Type-C detection
The reference design sometimes omits the mandatory 5.1kΩ pull-down resistors on the Configuration Channel ( CC1 and CC2 ) lines of the physical USB-C port. Without these, modern host devices (like iPads, MacBooks, or newer Android phones) will not supply power ( VBUS ). This often indicates a data underrun error, where
If a website claims to offer “CX31993 official drivers,” it is almost certainly malware. The only Microsoft-signed driver available is the inbox usbaudio2.sys (dated 2019 or later). A “datasheet fix” that involves downloading an executable is a scam.
A hub with an external power supply can sometimes provide cleaner power than a laptop's USB port. 3. Firmware Flashing (The "Deep" Fix)
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