Before reaching for a soldering iron, confirm the cause.
: Excessive heat can occur when the DAC draws more power than the internal thermal management can dissipate, especially on desktop PC ports that may lack strict current limiting.
The Conexant CX31993 has become the industry's go-to solution for portable, high-resolution USB audio. As the successor to the CX21988, this chip is not just an incremental update but a significant leap forward, designed to bring studio-quality sound to everyday mobile devices. To understand any thermal issues, we must first look at what the chip claims to do. cx31993 datasheet fix hot
Check continuity between the chip's thermal pad (exposed copper underneath) and main ground. If open → missing thermal vias.
Since an official datasheet is hard to find, technical communities rely on these verified parameters: 32-bit / 384kHz SNR (Signal-to-Noise Ratio): >128dB DNR (Dynamic Range): >120dB THD+N: 0.0003% (-95dB) Output Power: 65mW (dual channel) Amplifier Class: Class G Why it Gets "Hot" (Common Causes) Before reaching for a soldering iron, confirm the cause
Implement these fixes, and your CX31993 will return to its intended state: low power, cool to the touch, and sounding excellent.
The QFN-20 package has an exposed thermal pad (pin 21, center). The datasheet mandates: "The thermal pad must be soldered to a ground plane with at least 6 vias to the opposite layer." Most low-cost PCBs have no vias, only a small pad. Heat gets trapped inside the chip. As the successor to the CX21988, this chip
If your CX31993 dongle is running too hot or experiencing issues, here are the most effective solutions gathered from community testing and DIY fixes. 1. The "Idle" Heat Fix