Cx31993 Datasheet Today
The datasheet figures reveal a limitation: the CX31993 is optimized for IEMs (In-Ear Monitors) and low-impedance headphones. With a max output of 1.2Vrms, it struggles to drive high-impedance studio headphones (e.g., Sennheiser HD600 series at 300Ω). On a 300Ω load, the power output drops to roughly 0.5mW, resulting in low volume.
Independent measurements of commercial dongles using the CX31993 (e.g., Avani, Abigail, JCALLY JM6) show:
| Parameter | Measured Value | | --- | --- | | Output Impedance | < 2 Ω | | Max Output (32Ω load) | 1 Vrms (~31 mW) | | Max Output (no load) | 2 Vrms | | SNR (A-wt) | 119 dB | | Crosstalk | -85 dB @ 1 kHz | | Frequency Response | ±0.1 dB (20 Hz – 20 kHz) | | Jitter (USB bus-powered) | < 50 ps RMS | cx31993 datasheet
The datasheet would provide a detailed pinout describing each pin's function, such as:
While the full NDA-protected datasheet is restricted, publicly available specifications and reverse-engineered data reveal the following key parameters: The datasheet figures reveal a limitation: the CX31993
Official datasheets typically include pinout diagrams, register maps, and thermal characteristics. For the CX31993, the core logic is contained in a QFN-16 or WLCSP package. Pin 1 is usually the VBUS detection (5V input), while Pins 7 & 8 handle the USB D+/D- differential pair.
To fully appreciate the CX31993 datasheet, one must compare it to the market alternatives. Output Power:
| Feature | CX31993 | Realtek ALC5686 | Realtek ALC4042 | | :--- | :--- | :--- | :--- | | Max Sample Rate | 384 kHz | 384 kHz | 96 kHz | | SNR | 124 dB | 120 dB | 104 dB | | THD+N | -93 dB | -95 dB | -85 dB | | Output Power (32Ω) | 30 mW | 33 mW | 40 mW | | DSD Support | DSD128 | DSD128 | No | | Typical Use | Mid-range dongles | High-end dongles | Budget dongles |
Conclusion: The CX31993 is superior to old Realtek ALC4042 chips (found in Google’s first dongle) but is technically beaten on sheer power by the ALC5686. However, the CX31993 has better noise immunity (124dB SNR), making it the king of black background silence.
In the wake of the smartphone headphone jack removal and the shift toward ultra-thin laptops, the humble USB-C to 3.5mm adapter has become an essential daily driver for millions of users. At the heart of many of the best-performing, budget-friendly dongles lies a specific integrated circuit: the Conexant CX31993.
For engineers and audio enthusiasts searching for the "CX31993 datasheet," the goal is usually the same: to verify power output (mW), Total Harmonic Distortion (THD+N), and compatibility with high-impedance headphones. While the full manufacturer datasheet is often restricted under NDA (Non-Disclosure Agreement) with Synaptics (which acquired Conexant), this article aggregates the publicly available technical specifications, electrical characteristics, and circuit design implications of the CX31993.