This reduces idle current from 18mA to 9mA. Requires a microcontroller to send at boot. Not for beginners.
: If the dongle becomes "burning hot" almost instantly, it likely has a manufacturing defect or internal short. In these cases, it is safer to return the unit for a replacement. Common Specs & Performance Specification Sampling Rate 32-bit / 384kHz Power Output My solution to overheating DAC dongles - HifiGuides Forums cx31993 datasheet fix hot
Heat issues are common when the chip is paired with a secondary amplifier, such as the MAX97220 . This reduces idle current from 18mA to 9mA
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. : If the dongle becomes "burning hot" almost
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.
Remember: In consumer electronics, . Every degree Celsius above the datasheet's nominal operating point represents inefficiency, reduced lifespan, and compromised audio quality. Fix the heat, and you unlock the true potential of the CX31993.