While the official datasheet remains an exclusive document, the public performance metrics paint a clear picture. The is a high-fidelity, low-power workhorse. It is not built for massive power (it won't drive planar magnetic headphones), but for the 99% of users with standard earbuds and IEMs, its 124dB SNR and DSD128 support offer audiophile-grade sound for less than $10 per dongle.
Headphone ground return line, featuring ground-loop isolation or impedance sensing circuitry. Microphone & Control Group (ADC / GPIO) MIC_IN: Microphone analog input path.
CX31993 Function: Predictive Heuristics & Autonomous Decision Matrix Voltage: 3.3V (Active) / 0.0V (Dormant) Warning: Do not apply power without an external logic dampener.
| Parameter | Condition | Min | Typ | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | | | USB-C Spec | 4.4 | 5.0 | 5.5 | V | | Quiescent Current | No audio | - | 15 | 25 | mA | | Dynamic Current | 1Vrms output | - | 35 | 45 | mA | | Output Load Impedance | Stereo out | 16 | 32 | 600 | Ω | | Output Voltage (RMS) | 1% THD limit | - | 1.0 | 1.2 | Vrms | | Crosstalk | 1kHz signal | - | -85 | - | dB | | Frequency Response | 20Hz - 20kHz | +/-0.1 | Flat | +/-0.5 | dB | cx31993 datasheet
The chip operates directly off the USB VBUS supply voltage but utilizes internal low-dropout (LDO) regulators to generate clean analog rails, minimizing the impact of source power supply noise. Digital Core Voltage (Internal) Analog Supply Voltage (Internal) Active Playback Current Standby / Suspend Current 4. Pin Configuration and Functions
"Come on, you little dark horse," she urged, recalling the old forum posts that called it a budget giant.
The technical data presented here is aggregated from public test measurements (AudioScienceReview, L7Audiolab), reverse engineering efforts, and application notes. For mass production, sign an NDA with Synaptics to obtain the full, official CX31993 datasheet. While the official datasheet remains an exclusive document,
Regulated voltage output to power electret condenser microphones.
is a high-performance, low-power USB Type-C digital-to-analog converter (DAC) chip frequently used in high-fidelity (Hi-Fi) audio dongles and expansion cards. It is designed to provide high-resolution audio decoding for mobile devices and computers that lack a dedicated 3.5mm headphone jack. Framework Community Core Specifications Any link to the cx31993 datasheet?
The CX31993 is engineered to meet modern high-resolution audio standards while maintaining a minimal thermal and power footprint. Digital-to-Analog Converter (DAC) Specifications Up to 32-bit PCM | Parameter | Condition | Min | Typ
The datasheet figures reveal a limitation: the CX31993 is optimized for 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.
The CX31993 integrates a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), a high-efficiency headphone amplifier, and a USB 2.0 full-speed/high-speed controller onto a single silicon die. This high level of integration eliminates the need for an external microcontroller or a separate audio bridge chip, minimizing the overall printed circuit board (PCB) footprint and reducing bill-of-materials (BOM) costs. 2. Key Architecture and Pin Configuration