Datasheet | Cx31993
While the absence of an official public datasheet presents challenges for engineers seeking absolute certainty in their designs, the chip's widespread adoption and consistent positive performance across dozens of products serve as powerful validation of its capabilities. When paired with a quality amplifier and implemented with careful PCB layout, the CX31993 remains one of the most compelling choices in the budget portable DAC market.
The CX31993 typically comes in a small package, making it ideal for the slim profiles of USB-C dongles.
Eliminates bulky DC-blocking coupling capacitors on the headphone outputs. This flattens low-frequency bass extension and saves valuable PCB surface area. 2. Technical Specifications & Parametric Benchmarks
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. cx31993 datasheet
Years later, when the startup had grown and the original glider had become a fleet, younger engineers would ask how they’d achieved such reliable timing with discontinued parts. Mara would hand them the framed page, point to her margin scribbles, and say, “Read it. Build what it tells you.”
If a visual block diagram were present in the official datasheet, it would show the following internal architecture:
Supports external MCU control for custom features or LED indicators. 3. Pin Configuration and Package While the absence of an official public datasheet
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Integrating high-quality audio into Raspberry Pi or Arduino-based media centers. 6. CX31993 vs. Competitors (ALC5686 / ES9280)
Today’s target was a salvage haul from a sunken drone carrier. Mostly rusted hull plating and fried servo motors. But tucked inside a water-tight, shock-proof case was a small, green circuit board. their labels rubbed by time.
The CX31993 is engineered to transition raw digital audio packets from a host processor over a USB bus into pristine analog signals capable of driving standard transducers. Simultaneously, its integrated ADC framework captures microphone line signals, packing them into digital frames back to the host.
The CX31993 is designed for a variety of portable audio applications:
One night the supply manager burst in with news: a batch of salvaged CX31993s had been found in a recycler’s crate. They were mixed with obsolete sound chips and obsolete microcontrollers, their labels rubbed by time. “You want them?” he asked. Mara looked at the printouts tacked on the board and then at a dog-eared page of the datasheet—on it, a peculiar note: “Tolerance may vary with temperature; intended for non-critical timing.” It felt like a warning tucked into a friendly letter.
-95 dB (0.0018% into 32 Ωcap omega Output Power: ~31 mW per channel into 32 Ωcap omega ADC Performance (Recording/Microphone) Resolution: 16-bit, 24-bit PCM Sampling Rates: 44.1 kHz to 96 kHz THD+N (Mic Input): -90 dB Microphone Bias Voltage: Programmable from 1.8V to 2.8V Power Consumption