The CX31993 (often branded by Conexant or Synaptics) is a popular budget USB-C DAC chip known for high-resolution audio (32-bit/384kHz) but frequently lacks an official, public datasheet. Users often report "hot" operating temperatures or overheating, especially when paired with an external amplifier like the MAX97220.
Procedure:
The CX31993 is a popular high-performance USB-C DAC chip frequently used in affordable "dongle" amplifiers like those from JCALLY, Audiocular, and Abigail. While it offers impressive specs like 32-bit/384kHz PCM decoding and a high signal-to-noise ratio (SNR) of over 128dB, users often report issues with the device becoming physically hot or producing static when used with a PC. CX31993 Key Technical Specifications cx31993 datasheet fix hot
To fix the "hot" problem, you must identify which plague your dongle suffers from. The CX31993 (often branded by Conexant or Synaptics)
…passively dampens the electrical treble resonance. The chip’s 2Vrms output drives them cleanly, and the headphones’ own impedance profile smooths the hot region without external parts. Pin Configuration: A detailed diagram showing the pin
Instead of modifying the dongle (which is impractical), fix the load. The goal is to reintroduce a gentle low-pass filter and impedance matching. Apply one of these two verified solutions: