The cleanest public reference is the , but it omits many details above. For actual design fixes, refer to the JCALLY JM06 schematic (leaked, but verified) or the USB-IF test report for VID 0x262A (Conexant’s USB audio class descriptor).
Let’s be clear from the start: You cannot “fix” your dongle by downloading a PDF. However, the search for this keyword usually stems from a deeper problem: Windows, macOS, or Android failing to recognize the device, audio dropouts, blue screen errors, or poor volume scaling.
Because many manufacturers copy generic, unoptimized reference schematics, several systematic flaws plague Cx31993 implementations. If you are experiencing audio dropouts, poor microphone quality, or device recognition failures, use these verified hardware fixes.
A Closer Look at the CX31993 Datasheet Fix – Clarifying the Specs for a Popular USB DAC Chip Cx31993 Datasheet Fix
. Since this is a Class G chip, this isn't "switching noise" like a Class D amp. The best fix is implementing a low-pass filter
The Conexant (now Synaptics) CX31993 is a highly popular, low-power USB Type-C digital-to-analog converter (DAC) chip. It powers countless budget audiophile dongles, headphones, and custom DIY audio boards. However, hardware engineers, hobbyists, and DIY enthusiasts frequently run into a major roadblock: the lack of a comprehensive, easily accessible public datasheet, combined with confusing reference designs that lead to hardware failures, poor audio quality, or recognition issues.
Example corrections likely needed (concise) The cleanest public reference is the , but
Ensure the output coupling capacitors (if using an AC-coupled configuration) are rated for at least 220µF to prevent low-frequency roll-off. For DC-coupled designs, double-check that the virtual ground plane is completely isolated from the digital ground (DGND). 2. Firmware and Register Initialization Fixes
If your DAC is not initializing, the problem usually stems from incorrect USB-C CC line configurations or unstable core voltages.
The document also includes a from a working Tenhz T4 dongle, serving as a golden reference. However, the search for this keyword usually stems
If you are still experiencing issues, you may want to check if the device works on a different operating system, such as FreeBSD, as suggested by some users, to rule out a hardware failure.
Which and operating system are you connecting the DAC to? Share public link