: 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.
Despite this, the CX31993 remains one of the best budget audio solutions on the market for its superior audio performance, making the slight thermal management worth the effort.
If you are building a custom board, ensure there is a thermal pad or copper pour connected to the ground pins of the CX31993 to act as a heatsink. Community Post Draft Title: 🚀 CX31993 DAC: The Specs & The "Heat" Fix
Similarly, users of the JCALLY JM7 reported: "It didn't heat up at all after testing for a long time; it's cold." . So, if you hold the casing and it feels physically painful to the touch, something is definitely wrong. cx31993 datasheet fix hot
Understanding the CX31993 Datasheet and Fixing Heating Issues
is designed for low power consumption, but high-intensity use—such as high-fidelity audio playback on PCs or driving demanding IEMs—can cause the small chip to dissipate significant heat.
Some cheap AliExpress clones have defective EEPROMs that fail to put the chip into standby mode when idle. The CX31993 is supposed to draw <1mA when muted, but a bad firmware flash keeps the amp biased to Class A. : While many standard CX31993 implementations run cool,
Conexant CX31993 is a widely utilized, high-performance Class G audio DAC (Digital-to-Analog Converter) chip often integrated into affordable USB-C dongles. While praised for its 32-bit/384kHz sampling rate and neutral sound signature, some users experience overheating issues, which can lead to audio artifacts like static or hiss.
The official Conexant (now Synaptics) CX31993 datasheet lists the chip as a "high-performance, low-power audio codec." The keyword is low power . The sheet claims a typical current consumption of for the digital-to-analog conversion.
Increase the USB buffer size. This reduces the number of interrupts the DAC has to process. Community Post Draft Title: 🚀 CX31993 DAC: The
Do this if you see HF ripple or the chip heats up even with no audio.
This reduces idle current from 18mA to 9mA. Requires a microcontroller to send at boot. Not for beginners.
Check the signal path, including input and output connections, for any signs of damage, oxidation, or poor contact.