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Digital Ground (DGND) and Analog Ground (AGND) connect at a single point (star ground) under the chip using a 0-ohm resistor or net tie. Audio & Controls HPLcap H cap P cap L HPRcap H cap P cap R
Many online sources (forum posts, low-cost dongle schematics) incorrectly label the CX31993’s pins, confusing it with the older or generic USB audio codecs. Based on the actual verified application in popular dongle DACs (e.g., JCALLY JM6, UGreen HiFi):
in your circuit design to clean up the output before it hits the jack. Improving the "Dull" Sound: Early reviews on suggest the has a "warm, analogue-like" signature
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Highly recommended for anyone tired of shouting into a void of silent driver buffers. Cx31993 Datasheet Fix
Fix 1: Resolving the "Missing Pull-Down" USB-C Recognition Error
Physical movement of the cable or sudden audio transients cause the chip to reset.
Add a low-capacitance ESD protection diode array (less than 0.5pF capacitance to prevent signal distortion) to protect the differential lines from static discharge during hot-plugging.
), which is more efficient than Class AB but cleaner than typical Class D. Resolution: Supports up to 32-bit / 384kHz Typically rated at , providing a "black background" with minimal floor noise. 3. Common "Fixes" & Troubleshooting Digital Ground (DGND) and Analog Ground (AGND) connect
Understanding the Cx31993 Datasheet: Common Document Errors and Fixes
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Modify the detection network resistance. In many schematics, placing a 10kΩ resistor in series with the detection pin stabilizes the feedback loop, preventing false-positive shutdowns during demanding audio passages. 4. Software and Firmware Optimization
To troubleshoot the Cx31993 effectively, you must understand its core operating parameters. The chip integrates a USB 2.0 controller, a high-resolution DAC, an analog-to-digital converter (ADC) for microphone input, and a headphone amplifier onto a single die. Key Performance Metrics Up to 32-bit / 384 kHz Improving the "Dull" Sound: Early reviews on suggest
This chip is widely used in a plethora of products, from simple dongles to more advanced portable DACs offered by brands like JCALLY, BQEYZ, and Kinera.
Understanding the chip's baseline performance is crucial before implementing any technical fixes: Any link to the cx31993 datasheet? - Facebook
The standard datasheet schematic swaps several critical pins, leading to immediate hardware failure or unrecognised USB devices if followed blindly. 1. USB Data Lines (D+ / D-)
Fix 4: Sudden Disconnections Under Heavy Bass (Impedance Triggers)