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The (now often produced under the Synaptics umbrella following acquisitions) has become the gold standard for affordable, high-fidelity USB-C to 3.5mm audio adapters. While the public datasheet is restricted under NDA for manufacturers, extensive reverse engineering and community testing have allowed us to reconstruct a "functional datasheet" of its core specifications and electrical characteristics.
If you are debugging a board with this chip: cx31993 datasheet
| Parameter | Conditions | Min | Typ | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | | | A-Weighted, 48kHz | 106 | 109 | - | dB | | THD+N | 1kHz, 32Ω load | 0.0015% | 0.003% | 0.005% | % | | Output Power | 32Ω, 1% THD | - | 30 | - | mW | | Output Power | 16Ω, 1% THD | - | 55 | - | mW | | Crosstalk | 1kHz | -85 | -80 | - | dB | | Output Impedance | - | - | < 2 | 2.5 | Ω | | Frequency Response | 20Hz – 20kHz | ±0.1 | - | ±0.3 | dB | The (now often produced under the Synaptics umbrella
) is a highly popular, low-cost Hi-Fi USB DAC/AMP chip. While a formal, full manufacturer datasheet is difficult to find publicly, technical specifications from retailers like Concept Kart and Amazon provide a clear picture of its capabilities. Technical Specifications Conexant (CX-Pro) CX31993 USB-C Amp/DAC Review While a formal, full manufacturer datasheet is difficult