Cx31993 Datasheet Fix Hot Jun 2026
Comprehensive Guide to Fixing Overheating in CX31993 USB-C DACs: Datasheet Analysis and Solutions The Conexant CX31993 Go to product viewer dialog for this item.
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| Problem | Likely Cause | The "Datasheet" Fix | | :--- | :--- | :--- | | | Buffer Underrun / Driver Interrupt | On Raspberry Pi or Linux, increase the ALSA buffer size. For Windows, disable "Audio Enhancements" in Sound Settings to reduce CPU load on the USB pipeline. | | Audio Cutting Out / Static | USB Host Power Management | Go to Device Manager > Universal Serial Bus Controllers > USB Root Hub > Properties > Power Management . Uncheck "Allow the computer to turn off this device to save power". | | No Sound (Stuck at 16-bit) | Windows Spatial Audio Conflict | Windows Spatial Audio (Dolby/Sonic) is incompatible with 32-bit/384kHz streaming. Set Windows Sound Properties to 24-bit, 192000 Hz (Studio Quality) rather than the max 32-bit to keep the connection stable. | | DAC Only Works on One Side (Mono) | Cold Solder Joint | The CX31993 is a 4-wire output, but many cheap dongles have poor soldering. Apply gentle pressure near the USB-C housing. If sound returns, replace the dongle (quality control issue). | | High Power Drain | Misconfigured USB Mode | The datasheet specifies low power draw. If your phone battery drains fast, the DAC is stuck in "High Speed" mode. In Developer Options, toggle "USB Debugging" ON/OFF to reset the power handshake. | cx31993 datasheet fix hot
The reference design ties analog and digital grounds through a ferrite bead, but cheap dongles omit this. High-frequency switching noise from the USB bus leaks into the analog output, adding a 2–3dB rise in perceived treble roughness above 8kHz.
Because it’s an integrated budget chip, it may exhibit electrical noise above 20kHz, which can contribute to minor thermal overhead during complex decoding. Comprehensive Guide to Fixing Overheating in CX31993 USB-C
Do this if you see HF ripple or the chip heats up even with no audio.
According to the manufacturer's datasheet specifications, here is how the chip is designed to perform: For Windows, disable "Audio Enhancements" in Sound Settings
Which (Windows, Android, iOS) are you using with the DAC?
Any "hot fixes" should be approached with caution and are ideally done by someone with a good understanding of electronics and the risks involved (e.g., potential for further damage).
: While many standard CX31993 implementations run cool, units paired with a MAX97220 op-amp for higher power output (up to 125mW) are more prone to heating up.