Cx31993 Datasheet Fix -
Add a low-capacitance ESD protection diode array (less than 0.5pF capacitance to prevent signal distortion) to protect the differential lines from static discharge during hot-plugging.
The datasheet specifies a maximum operating voltage of 3.6V, but you're experiencing issues with the chip operating above 3.3V.
Despite its importance, the Cx31993 datasheet can be prone to errors, inconsistencies, and omissions. Some of the most common issues include:
To troubleshoot the Cx31993 effectively, you must understand its baseline capabilities and operating parameters. Up to 32-bit / 384 kHz Signal-to-Noise Ratio (SNR): ~130 dB Dynamic Range (DNR): ~117 dB Total Harmonic Distortion + Noise (THD+N): -95 dB Output Power: 1Vrms @ 32 Ohms (roughly 31 mW) Power Consumption: ~40 mA active, near-zero standby
: Hearing a constant white noise, static, or an audible noise floor can be frustrating and distracting during quieter passages of music. Cx31993 Datasheet Fix
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: Some copied schematics include 220µF electrolytic capacitors on the outputs, which severely rolls off the bass response and wastes board space. Microphone and Jack Detection (MIC / HP_DET) The headset microphone line ( MICcap M cap I cap C ) and plug detection line ( ) are highly sensitive to impedance. The Fix : Add a 2.2kΩ pull-up resistor from the MICcap M cap I cap C bias pin to the internal MIC-LDO voltage rail. For the
This comprehensive guide serves as an unofficial datasheet fix, addressing the most common hardware implementation errors, missing register documentation, and circuit stability issues. 1. Hardware and Schematic Corrections
The Conexant/Synaptics Cx31993 is a highly popular, low-power, high-resolution USB-C digital-to-analog converter (DAC) and audio codec. It is widely used in portable headphone dongles, DIY audio repair projects, and custom audio hardware because of its excellent performance-to-cost ratio. However, because official datasheets for this integrated circuit (IC) are notoriously difficult to obtain outside of strict corporate Non-Disclosure Agreements (NDAs), engineers and hobbyists often struggle with integration errors. Add a low-capacitance ESD protection diode array (less
The dongle is recognized, but no sound comes out, or the sound cuts out intermittently. Audio may stutter or crackle during heavy system use.
When implementing this chip, three primary symptoms indicate a configuration error:
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Lowers DC resistance to maximize power delivery to headphones X7R or X5R dielectric materials only Some of the most common issues include: To
The cleanest public reference is the , but it omits many details above. For actual design fixes, refer to the JCALLY JM06 schematic (leaked, but verified) or the USB-IF test report for VID 0x262A (Conexant’s USB audio class descriptor).
The microphone input is completely dead, or it records with massive distortion and low gain.
Connect a separate 5.1kΩ pull-down resistor from CC1 to GND, and another 5.1kΩ pull-down resistor from CC2 to GND. Additionally, add a 10Ω resistor in series with the VBUS line before the decoupling caps to limit inrush current spikes that trip smartphone over-current protection (OCP). Fix 2: Audio Hiss, Whine, or High-Frequency Buzzing