Up to 117dB to 124dB (depending on implementation and power filtering). Total Harmonic Distortion (THD+N): -95dB (0.0017%).
is a high-performance standalone DAC (Digital-to-Analog Converter) decoder chip designed for USB-C to 3.5mm/4.4mm adapters. It is frequently paired with independent amplifiers like the MAX97220 to boost its power output. Detail DAC Chip Conexant CX31993 (CX Pro Resolution Up to 32-bit / 384kHz PCM SNR Dynamic Range (DNR) THD + N 0.0003% (-95dB) Output Power 65mW @ 32Ω (typically 2Vrms) Microphone Support ADC 24-bit / 96kHz recording DSD Support DSD 64/128 (PCM) Common Issues and How to "Fix" Them 1. Low Volume or "Capped" Output Users often find that the
A well-organized and formatted datasheet is essential for easy navigation and understanding. Consider the following:
: Use a dedicated USB-A to USB-C adapter if the native port is unstable. cx31993 datasheet fix better
The Conexant CX31993 is a DAC chip that can dramatically improve the sound quality of your devices. However, its performance relies on correct implementation and configuration . By understanding its datasheet's strengths and knowing how to fix its common issues, you can confidently unlock a superior audio experience without spending a fortune.
The CX31993 is capable of and 0.002% THD+N —but the datasheet hides that behind sparse documentation. Apply these fixes and you’ll outperform many off-the-shelf dongles.
"CX31993" refers to the chip itself. "CX PRO" is a marketing term typically used by AliExpress sellers to denote a dual-chip implementation (including an amplifier). Unless the product listing explicitly shows the MAX97220 chip, the "PRO" label means nothing. Up to 117dB to 124dB (depending on implementation
Without an official corrected datasheet, designers rely on guesswork and trial. A community-driven "fixed" datasheet—based on actual hardware measurements and USB descriptor analysis—would significantly reduce development time for CX31993-based products. Synaptics should consider releasing a full public datasheet to support the growing USB-C audio ecosystem.
Lower the digital volume of the source device to 90% and use your media player's internal bit-perfect volume control. This prevents digital clipping and helps reduce the audible noise floor.
| Feature | Conexant CX31993 | Realtek ALC5686 | | :--- | :--- | :--- | | | Up to 32-bit/384kHz | Up to 32-bit/384kHz | | Signal-to-Noise Ratio (SNR) | >128dB (DAC) / 124dB (DAC+HP) | ~124dB | | Distortion (THD+N) | 0.0003% (-112dB) | Not widely published | | Key Strengths | Objectively superior specs, great for general reliability and "transparent" sound | Subjective "musical" sound profile, but may cause relay/popping noise on some devices | | Target Audience | Users who want measurable, distortion-free performance | Users who prefer a warmer, "analog-like" sound signature | It is frequently paired with independent amplifiers like
However, many enthusiasts and hardware developers face common implementation issues. Because the official CX31993 datasheet is notoriously difficult to source publicly, building or troubleshooting these devices can lead to persistent bugs. These include , hardware volume control loops, and an audible high-frequency background hiss when driving highly sensitive In-Ear Monitors (IEMs).
Without the datasheet, manufacturers often copy reference designs incorrectly. This leads to:
The Conexant CX31993 is a highly popular budget DAC chip known for its transparency and high-resolution support (32-bit/384kHz) in portable USB-C dongles