Cx31993 Datasheet

Cx31993 Datasheet

The CX31993 is a high-performance USB-C Audio DAC (Digital-to-Analog Converter) chip widely used in budget-friendly "dongle" adapters to improve sound quality on smartphones and computers. While a full technical datasheet from the manufacturer is not publicly available, community-sourced specifications provide a clear picture of its capabilities. Key Specifications

Resolution & Sampling Rate: Supports up to 32-bit / 384kHz PCM audio.

Signal-to-Noise Ratio (SNR): Greater than 128dB, ensuring a very clean signal with minimal background hiss. Dynamic Range (DNR): Greater than 120dB.

Distortion (THD+N): Approximately 0.0003% (-95dB), indicating high transparency.

Power Output: Typically delivers around 65mW into 32Ω. Some implementations, like those paired with a MAX97220 amplifier chip, can reach approximately 60mW @ 22Ω. Performance & Features

Audio Quality: Users frequently report a noticeable boost in clarity for mids and highs compared to standard phone outputs, with more "existent" bass.

Compatibility: It is widely compatible with Windows 10/11, macOS, Android, and iPhone 15/16 models.

Integrated Controls: The chip supports in-line controls (volume/play/pause) and microphone input for calls.

Adaptive Gain: Some implementations feature an impedance-sensing mechanism that may lower output power for low-impedance IEMs to prevent clipping, though this can sometimes be bypassed by connecting the adapter to the headphones before plugging it into the device. Any link to the cx31993 datasheet?

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 cx31993 datasheet

is often described as having a warmer, more musical sound signature with deeper bass response. Any link to the cx31993 datasheet?

The CX31993! That's a interesting part.

The CX31993 is a dual-channel, 24-bit audio codec (coder-decoder) chip developed by Sony. Here's a brief report based on its datasheet:

Overview

Key Features

Technical Specifications

Pinout and Package

Applications

Conexant CX31993 (often branded as CX-Pro) is widely reviewed as a high-performance, budget-friendly USB-C DAC/amp. While an official "Conexant" datasheet is difficult to find because the company was acquired by

in 2017, its technical capabilities and real-world performance are well-documented through enthusiast testing. Core Specifications (from Datasheet Data) Resolution: Supports up to 32-bit / 384kHz PCM. Output Power: Typically rated at 65mW @ 32Ω 1.0 Vrms output (superior to the 0.5V EU Apple dongle). Signal-to-Noise Ratio (SNR): Frequently cited at Dynamic Range (DNR): Distortion (THD+N): 0.0003% or ~95dB. Review Insights Conexant (CX-Pro) CX31993 USB-C Amp/DAC Review

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 The CX31993 is a high-performance USB-C Audio DAC

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.

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.

Part 5: Design Application – Building a Dongle

Engineers seeking the CX31993 datasheet are often designing a USB-C audio adapter. Here are the reference design rules:

2. Key Features (Based on Available Datasheet Specifications)

While the full NDA-protected datasheet is restricted, publicly available specifications and reverse-engineered data reveal the following key parameters:

Regulatory and compliance

The CX31993 Datasheet

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 CX31993 is a high-performance, low-power audio codec

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.

1. Overview

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.

Part 7: Software and Driver Support (The Hidden Spec)

The datasheet’s software section is crucial for Windows and Linux compatibility.

Functional blocks (high level)

3. Typical Application Circuit (From datasheet)

A minimal working circuit includes:

Block diagram from datasheet would show:
USB PHY → USB Audio Controller → DSP (optional equalizer, bass boost) → DAC → HP Amp → 3.5mm jack.