~117 dB to 130 dB (depending on implementation) Total Harmonic Distortion + Noise (THD+N): -95 dB Output Power: ~30mW into 32 ohms Interface: USB Type-C (UAC 2.0 compliant) Pinout and Signal Topology
Feedback pins. These must be routed back from the headphone jack terminals to provide active DC offset correction and load sensing.
Place a low-capacitance ESD protection diode array (such as the USBLC6-2SC6) directly behind the USB Type-C receptacle. Keep trace lengths to the D+ and D- pins perfectly symmetrical to maintain impedance matching. Eliminating the 1kHz USB Packet Hum
I can provide targeted troubleshooting steps or component values for your specific application. Share public link Cx31993 Datasheet Fix
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
Add to both CC1 and CC2 pins on the USB-C plug. Intermittent Audio Dropouts USB power sagging or high ESR caps.
A dual-channel USB audio codec designed for low power consumption and high integration in mobile devices. Compatibility: ~117 dB to 130 dB (depending on implementation)
(changing IEM eartips) or using specific headphones to balance the slightly rolled-off highs. Power Limitations:
The CX31993 features a capless headphone driver architecture. Do not place large DC-blocking capacitors in series with the audio output. The outputs are referenced to a virtual ground.
Fixing issues with the (a popular high-performance Conexant USB-C DAC chip) typically involves addressing "datasheet" errors in how the operating system or player app interprets the hardware's capabilities rather than a physical modification. 1. Fix Audio Static & Stuttering (Bit-Perfect Mode) Keep trace lengths to the D+ and D-
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To manage expectations, it's helpful to know how the CX31993 compares to other popular chips. The following table summarizes the key differences: