The CX31993 is a highly integrated, low-power audio codec from Conexant (now part of Synaptics). It is designed primarily for USB Type-C wired headsets and dongles, enabling high-resolution audio playback and voice capture through a single connector. It is widely recognized in the consumer electronics market for offering superior audio quality compared to basic passive USB-C analog dongles.
The CX31993 datasheet lived on a cool, cluttered server in a forgotten lab—a tidy PDF among schematic diagrams and firmware notes. For most engineers it was a tool: pinouts, timing diagrams, electrical characteristics neatly boxed in monochrome tables. For Mara, it was a map.
Mara found it the night she couldn't sleep, finger tracing the silicon-era font of the table of contents. She worked as a hardware bring-up engineer at a small robotics startup, but lately the company had stalled on a stealthy, underwater glider project. The guts of the design had been outsourced years ago to a supplier who'd vanished when the venture faltered. Only one line in the bill of materials glowed with promise: CX31993 — a mixed-signal timing-and-control IC labeled “discontinued” but still mysterious.
She pulled the datasheet open and read the dry first page like a detective scans a file: “Low-power multi-channel synchronizer and analog switch. Precision timing, internal oscillator options, TTL/CMOS interfaces.” The features read like instructions to a different life. She saw, oddly, a rhythm—a heartbeat of electronic verbs: latch, switch, debounce, synchronize. Words that made wires sing.
Mara printed the pages and pinned them to a whiteboard, arranging callouts like constellations. Each waveform diagram became a star. The typical application circuit sketched a small island of parts — resistor networks, LEDs, a hermetic connector — and beneath it the hint of an idea: simplicity.
She started small. A breadboard, an old microcontroller, a handful of capacitors she scavenged from broken equipment. Late into the night, the CX31993’s oscillator hummed in translucent green on the scope, its timing edges neat as a metronome. The datasheet's “Absolute Maximum Ratings” page, which the less meticulous often ignored, had saved her a charred MOSFET and a migraine; its “Typical Operating Characteristics” page taught her patience. Each clause in the document folded into her routine—she measured propagation delay the way others measure coffee intake.
The glider problem had been power and timing. The actuators needed crisp, predictable pulses to change buoyancy; the comms module slept too deeply and woke late, missing windows for synchronized data bursts. The CX31993, with its multi-channel synchronizer and programmable timing, fit like a key she'd carved from observation. Where the partner board had relied on a labyrinth of discrete logic, this single chip offered something else: orchestration.
Weekends became experiments. She wrote firmware that treated the CX31993 as a conductor. The device’s internal oscillator could be nudged with a resistor; its timing registers could be held in temporary states with cleverly timed-enable pulses. Using the datasheet’s example of phase alignment, she coaxed the glider’s valves to open in gentle counterpoint, each current pulse spaced by microseconds. The wings of the craft folded and extended in a whisper instead of a shove. Power draw dropped; synchronization improved. The glider rose smooth as a drawn breath.
Word of her progress leaked in the office like ozone. Engineers clustered by the whiteboard to read the datasheet's annotated margins—Mara’s notes in blue highlighter, margin sketches of pulse trains annotated “try with 10k pull-down.” They loved the math (the datasheet’s timing curves were elegant), but what they loved most was the story she let them borrow: how a single datasheet, read with care, could rescue a stalled project.
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.
“Yes,” she said. “But we’ll test each one.”
The testing station became a ritual. Every chip was run through the datasheet’s gauntlet: stress tests across temperature ranges, jitter measurements against the specified maximum, behavioral checks for spurious oscillation. Some chips failed, skewing like small, rusty rowboats. Some performed better than spec—lucky survivors after a decade in crates. For the glider, only a handful were needed; for funding and pride, they needed many more.
As the prototype version two took shape—sleeker hull, quieter pump, CX31993s humming in a papered choir—the team began to see the datasheet differently. It was no longer a static document; it was a living manual, a relationship. They annotated it with things the manufacturer never intended: which batches had more tolerance to humidity, which pin combinations caused odd metastability. The “recommended operating conditions” box filled with notes like bits of advice passed between sailors.
At the launch, the glider slipped into a harbor at dawn. The team held their breath as it submerged, a dark pebble sinking then steadying. Hours later it surfaced at the right interval, flashed its burst of telemetry, and dove again, accurate to the second. The data streams arrived like postcards: buoyancy cycles matched predicted curves; comms windows were hit precisely; power consumption held below the budgeted line. They had turned a forgotten datasheet into a choreography.
Mara kept the original datasheet framed in her office. Beneath it she hung a small plaque engraved with one line from the document’s final page: “Designed for precision in constrained environments.” It read, to her, like a promise.
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.”
The datasheet—once a monochrome PDF among many—had become a story: of rescue, of careful reading, of patience and testing. It taught them to look for music where others saw only tables, and to believe that small, well-documented parts, treated with respect, could orchestrate something far larger than their datasheet boxes.
The glowing blue light of the CX31993 was the last thing Elara saw before the noise floor finally swallowed her world.
She was a "Sonic Archaeologist," a title she’d made up to justify spending her life digging through the digital remains of the 21st century. Her latest find was a small, silver-braided cable—a relic of an era when humans still used physical wires to pump sound directly into their skulls. At its heart sat the Conexant CX31993, a tiny piece of silicon that promised high-resolution salvation in a world of compressed static.
"Thirty-two bits," she whispered, her voice cracking in the dry air of the archive. "Three hundred and eighty-four kilohertz." The numbers felt like a prayer. cx31993 datasheet
In her time, audio was a luxury. The Great Muffling had left the atmosphere thick with electromagnetic interference, turning every song into a muddy mess. But according to the CX31993 datasheet, this little chip had a signal-to-noise ratio (SNR) of 128dB. It was a surgical tool designed to cut through the hum of the universe.
She plugged the ancient USB-C connector into her rig. Her console flickered, recognizing the device with a archaic ping. "UAC1.0 detected," the screen flashed.
"Come on, you little dark horse," she urged, recalling the old forum posts that called it a budget giant.
As the first track began to play, the "lean, neutral-to-slightly-bright" tonality the datasheet promised flooded her senses. The low-impedance IEMs in her ears didn't just play music; they reconstructed a lost reality. She could hear the distinct "air" between instruments, a transparency that the bulky, more expensive amplifiers of her era could never mimic.
But there was a catch—the datasheet warned of its limits. At 1V RMS, it was an efficient beast, but it lacked the "thrust" to drive the heavy, 150-ohm "cans" of the old-world titans. When she tried to push a bass-heavy anthem, the low end felt "flabby," exactly as the ancient reviewers had prophesied.
Suddenly, a spike of 200kHz noise—the "Class D ghost" mentioned in a late-century engineering forum—screeched through the line. Elara scrambled to adjust her filters, realizing the chip was more than just a DAC; it was a window.
The datasheet wasn't just a list of specs; it was a map to a frequency range humans had forgotten how to hear. In that moment, surrounded by the silence of a dead century, Elara realized that as long as the CX31993 held its steady 0.0015% THD+N, the past would never truly be silent. Audio Expansion Card - CX31993 Datasheet
Understanding the CX31993: High-Fidelity Audio in a Tiny Package
If you’ve been looking for an affordable way to upgrade your mobile audio, you’ve likely stumbled upon the CX31993. This small but mighty System-on-Chip (SoC) has become a staple in the "dongle DAC" world, known for punching far above its weight class in terms of clarity and power.
Here is a breakdown of the technical specifications and performance highlights of the Technical Specifications at a Glance
Based on common implementation data found at retailers like Concept Kart and Amazon, here are the core specs: DAC Sampling Rate: Supports up to 32-bit / 384kHz.
Signal-to-Noise Ratio (SNR): >128dB, ensuring a clean background free of "hiss." Dynamic Range (DNR): >120dB. Total Harmonic Distortion (THD+N): -95dB. Output Power: Typically around 65mW @ 32Ω.
Interface: Native USB Type-C (compatible with Windows, Android, and iOS/iPadOS). Why It’s Popular Among Audiophiles The CX31993
is often favored over generic USB-C adapters for several reasons:
Bit-Perfect Audio: It supports high-resolution PCM files, allowing you to listen to "Master" quality tracks on streaming services like Tidal or Apple Music without downsampling. Low Power Consumption : Unlike some desktop-grade portable DACs, the CX31993
chip is designed for efficiency, meaning it won't drain your smartphone battery significantly during long listening sessions.
Clean Signal: With a high SNR of 128dB, it provides a "black" background, which is essential for sensitive In-Ear Monitors (IEMs) that often pick up electrical noise from poorly shielded devices. Common Implementation: The "CX-Pro" Dongle While the is a chip, you will most commonly find it inside the CX-Pro DAC Dongle . These devices often feature:
Braided Cabling: Usually 8-strand silver-plated copper for better durability and signal integrity.
Compatibility: Plug-and-play support for iPhone 15/16 series, Galaxy S-series, and Google Pixel. The CX31993 is a highly integrated, low-power audio
Build: Compact aluminum alloy shells that act as a heat sink and shield against RF interference. Verdict
If you are transitioning away from a device with a 3.5mm jack or simply want to squeeze better sound out of your IEMs, a
-based adapter is perhaps the best "bang-for-your-buck" upgrade available today. It offers a transparent, neutral sound signature that doesn't color your music, letting your headphones do the talking.
The CX31993 (often branded as Conexant) is a high-performance Digital-to-Analog Converter (DAC) and amplifier chip frequently used in USB-C to 3.5mm audio dongles and portable adapters. It is popular in the "Chi-Fi" (Chinese Hi-Fi) community for offering premium audio specifications at a budget-friendly price. Key Technical Specifications Based on manufacturer data and product listings, the Go to product viewer dialog for this item. typically features the following parameters: DAC Sampling Rate: Supports up to 32-bit / 384kHz.
Signal-to-Noise Ratio (SNR): >128dB, ensuring a clean signal with minimal background hiss. Dynamic Range (DNR): >120dB.
Total Harmonic Distortion (THD+N): 0.0003% (measured at -95dB).
Output Power (Thrust): Approximately 65mW (usually at 32 ohms), capable of driving most standard IEMs and efficient headphones. DSD Support: Compatible with DSD64/128 (often via PCM). Functionality & Compatibility
Interface: USB Type-C to 3.5mm (or 2.5mm/4.4mm balanced versions in some implementations).
Operating Systems: Plug-and-play compatibility with Android, iOS (USB-C iPads/iPhones), Windows 10/11, and macOS.
Features: Supports in-line controls (play/pause/volume) and microphone input for calls, which is a significant advantage over some audiophile-only DACs. Common Implementations
The chip is the centerpiece of several popular portable DACs available through retailers like Amazon and Concept Kart. These devices often use high-quality wiring, such as 8-strand silver-plated copper, to maintain signal integrity. Compared to other budget chips like the JM20, the
is often described as having a warmer, more musical sound signature with deeper bass response. Any link to the cx31993 datasheet?
The CX31993 represents a tier of audio hardware that prioritizes clarity and power efficiency. While many modern phones are moving toward USB-C dongles and wireless audio, having a dedicated, high-quality codec like the CX31993 on-board is a hallmark of a device designed for the true music lover.
Are you working on a project involving the CX31993? Drop your questions or schematic troubleshooting tips in the comments below!
The pneumatic hiss of the heavy door sealing shut was the only sound in the archive room. It meant the cooling fans had kicked in, and the air was being scrubbed of the corrosive humidity that rotted everything else in the Sector.
Elias didn't mind the cold. He adjusted his thermals and clicked on his high-lumen work light, the beam cutting through the dusty gloom. He was a Restoration Tech, third class. His job was simple: go into the dead zones, find the pre-Collapse tech, and catalog it before it was melted down for scrap.
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.
Elias picked it up with gloved hands. It was pristine. The silkscreening on the board was sharp, white text on a dark sea of fiberglass.
CX31993.
He squinted. He’d never seen that prefix. Usually, he dealt with power regulators or generic logic gates. This looked like a system-on-a-chip, intricate and dense with microscopic pathways.
He placed the board on his workbench and pulled up his terminal. The Archive database was spotty, reliant on ancient servers that hummed with the sound of failing bearings. He typed in the alphanumeric code: CX31993 Datasheet.
The screen flickered. A progress bar crawled across the display. Searching... Searching...
Then, a single file populated the screen. Not a standard PDF, but a raw, corrupted hex file with a header that made Elias’s breath hitch.
CLASSIFICATION: STRATEGIC AI CORE – PROJECT LAZARUS. DATASHEET CX31993: "THE GATEKEEPER"
Elias looked around. The security camera in the corner was a dummy unit, its lens long since shattered. He tapped the 'Open' command.
The text was fragmented, a ghost of a technical document.
Component: CX31993 Function: Predictive Heuristics & Autonomous Decision Matrix Voltage: 3.3V (Active) / 0.0V (Dormant) Warning: Do not apply power without an external logic dampener.
Elias leaned closer. Predictive Heuristics. It wasn’t just a processor; it was a brain. A specialized brain designed to guess what its operator wanted before they asked.
He looked at the chip. It sat there, cold and dead. The database entry was sparse, but a footnote at the bottom, highlighted in red, caught his eye.
Field Report 044: "The CX31993 doesn't just process data; it anticipates intent. It achieved 99.9% synchronization with the pilot during the Siege of Terminal 4. The pilot eventually stopped speaking. The chip knew the orders before the thought was fully formed."
Elias felt a chill that had nothing to do with the climate control. This was forbidden tech. Post-Collapse laws were strict: any AI capable of independent thought was to be destroyed immediately. It was the chaos of the Autonomous Wars that had reduced the world to this scavenger state.
He reached for his
Note: The full public datasheet for CX31993 is proprietary and not freely available. This guide is based on publicly disclosed specifications, application notes, and reverse-engineering from known products (e.g., Conexant/CX-Audio dongles). For register-level details, you must sign an NDA with the manufacturer.
The chip is controlled via I2C. Typical registers include:
| Address | Function | Example value | |---------|----------|----------------| | 0x00 | Chip reset | 0x01 (soft reset) | | 0x01 | Volume control L | 0x00 – 0x3F | | 0x02 | Volume control R | 0x00 – 0x3F | | 0x03 | Mute / unmute | bit0=1 mute | | 0x04 | Sample rate selection | 0x00=48k, 0x02=96k | | 0x05 | Headphone detection status | read-only bit | | 0x06 | Mixer / sidetone control | for mic monitoring |
Without the full datasheet, you cannot change advanced settings (e.g., digital filter roll-off, de-emphasis).
This is the section most visitors looking for the "CX31993 datasheet" care about. Here is the verified performance data based on OEM testing and reverse-engineered specifications.
| Parameter | Condition | Min | Typ | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | | Supply Voltage (VBUS) | 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 | The CX31993 (often branded as Conexant) is a
In the wake of the smartphone headphone jack removal and the shift toward ultra-thin laptops, the humble USB-C to 3.5mm adapter has become an essential daily driver for millions of users. At the heart of many of the best-performing, budget-friendly dongles lies a specific integrated circuit: the Conexant CX31993.
For engineers and audio enthusiasts searching for the "CX31993 datasheet," the goal is usually the same: to verify power output (mW), Total Harmonic Distortion (THD+N), and compatibility with high-impedance headphones. While the full manufacturer datasheet is often restricted under NDA (Non-Disclosure Agreement) with Synaptics (which acquired Conexant), this article aggregates the publicly available technical specifications, electrical characteristics, and circuit design implications of the CX31993.