Users frequently report a buzzing or "hissing" sound, especially with sensitive In-Ear Monitors (IEMs). Conexant (CX-Pro) CX31993 USB-C Amp/DAC Review
: Approximately 0.0003% (-95dB), ensuring minimal harmonic distortion.
By cross-referencing verified chip specifications with community hardware solutions, this guide provides a functional engineering summary, hardware fixes for common circuit limitations, and steps to extract better audio performance from CX31993-based devices. Core Hardware Specifications cx31993 datasheet fix better
Add a 3rd-order LPF after the CX31993 output pins (HP_OUT_L/R):
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[USB-C Power Input] ──> [Poor Decoupling Capacitor] ──> [CX31993 DAC] ──> [Idle Noise / Hiss] [RF / Phone Signal] ──> [Unshielded Trace Layout] ──> [MAX97220 Amp] ──> [EMI Buzzing] 1. High-Frequency Idle Hiss (The Sensitivity Mismatch)
For USB-C iPhones or Android devices, is the main problem. Core Hardware Specifications Add a 3rd-order LPF after
On Windows 10/11, the native generic UAC2 driver sometimes mismanages the chip's power states. Go to Device Manager , locate the CX31993 device, uninstall it, and let Windows reinstall the generic driver. Alternatively, install the official Synaptics/Conexant ASIO drivers if you require low latency.
The reference design uses no output filter, leading to >0.008% THD+N at 20kHz.