Cx31993 Datasheet Fix Hot

Users often report higher temperatures when connected to a PC compared to a phone, likely due to the PC's more robust (and sometimes noisier) USB power supply. Top Fixes for Overheating and Noise

You use 8-16 Ohm IEMs at high volume for hours. In that case, buy a dongle with a discrete op-amp (e.g., the JCALLY JM20 or the Apple USB-C dongle, which runs ice cold).

The CX31993 lacks an internal heat pad on its QFN package. Unlike desktop DACs that dissipate heat via the PCB ground plane, the CX31993 relies entirely on the dongle’s epoxy casing. If the manufacturer used a 2-layer PCB (most cheap dongles do), heat has nowhere to go. The chip thermally throttles at ~85°C, but the plastic case will burn your fingers long before that. cx31993 datasheet fix hot

Exceeds 128 dB in optimal setups. DNR (Dynamic Range): Over 120 dB . THD+N: 0.0003% (-95 dB).

The datasheet suggests a properly designed PCB should dissipate heat efficiently. Yet, the "hot" issue suggests many OEM dongles are operating at 100°C+ , far exceeding specs. Users often report higher temperatures when connected to

Class G (efficient power switching based on signal level). Total Harmonic Distortion (THD+N): 0.0003%. Fix: Why is it running "Hot"?

: A poor-quality USB-C cable can cause unstable power delivery, leading to the chip throttling or overheating. Check for Shorts The CX31993 lacks an internal heat pad on its QFN package

The CX31993 requires a 1.8V digital core and a 3.3V analog supply. Most dongles use a cheap LDO (Low Dropout Regulator) to step down USB’s 5V to these voltages. If the LDO is inefficient (e.g., a 1117 clone), it burns off 1.7V as pure heat before the power even reaches the DAC. This is the primary culprit.