5V USB Powered PCM2704 MINI USB Sound Card DAC Decoder Board

5V USB Powered PCM2704 MINI USB Sound Card DAC Decoder Board delivers high-fidelity audio conversion in an ultra-compact form factor for DIY enthusiasts, audiophiles, and embedded system designers. Powered directly by a standard 5V USB bus, this module incorporates the reputable Texas Instruments PCM2704 stereo digital-to-analog converter (DAC) chip to bypass noisy internal computer sound cards. Consequently, it generates clean, low-distortion audio signals with exceptional dynamic range through a 3.5mm stereo output jack and S/PDIF optical interface. Furthermore, its driverless plug-and-play architecture guarantees instant compatibility with mainstream operating systems without tedious driver installations. Therefore, you can easily integrate this decoder board into custom amplifiers, multimedia stations, or single-board computing projects to achieve superior sound quality.

Key Features:

• High-Resolution Decoding: Utilizes Texas Instruments PCM2704 DAC architecture to provide pristine 16-bit stereo digital-to-analog audio conversion.
• Plug-and-Play Operation: Eliminates the need for external drivers by adhering to standard USB Audio Class protocols across Windows, macOS, Linux, and Android.
• Direct USB Powering: Operates efficiently on standard 5V USB bus power, eliminating bulky external power supplies.
• Dual Audio Outputs: Features both a 3.5mm analog stereo headphone jack and a digital optical S/PDIF output for versatile connectivity.
• Onboard Control Interface: Includes keypads for volume up, volume down, and mute to facilitate convenient manual control.

Technical Specifications:

• Main Chipset: Texas Instruments PCM2704 Audio DAC
• Operating Voltage: 5.0 V ±5% DC (USB Bus Powered)
• Sampling Rates: 32 kHz, 44.1 kHz, 48 kHz
• Resolution: 16-Bit Delta-Sigma Stereo DAC
• Signal-to-Noise Ratio (SNR): ≈ 98 dB (Typical)
• Total Harmonic Distortion + Noise (THD+N): 0.006% (RL ≥ 10 kΩ)
• Output Power: 12 mW per channel into 32 Ω
• Digital Output Format: S/PDIF (IEC 60958 Consumer Format)

Mechanical Specifications:

• PCB Material: FR-4 High-Quality Double-Sided Glass Fiber Board
• Input Interface: Mini USB Type-B Female Connector
• Output Connectors: 3.5mm Stereo Audio Jack and Optical TOSLINK Jack
• Mounting Holes: 4 x M2.5 Pre-Drilled Mounting Holes
• Status Indicator: Onboard Power LED Indicator

Dimensions:

• Board Length: ≈ 47 mm
• Board Width: ≈ 30 mm
• Overall Height: ≈ 12 mm
• Weight: ≈ 11 g

Pinout and Wiring:

• Mini USB Port: Connects to host PC or single-board computer for 5V power supply and USB data transmission.
• 3.5mm Output Jack: Connects directly to headphones, active speakers, or auxiliary inputs of external audio amplifiers.
• Optical Port: Outputs digital S/PDIF audio bitstream to external high-end DACs or home theater receivers.
• Key Interfaces (Vol+, Vol-, Mute): Provide onboard hardware tactile buttons to adjust volume levels and toggle mute functions.
• Note: However, ensure the connected USB port supplies stable 5V current to avoid power supply ripples that may degrade audio signal purity.

Datasheet Reference:

• Download Texas Instruments PCM2704 Datasheet

Commonly Used in:

• Desktop Audio Upgrades: Replacing integrated, interference-prone motherboard sound outputs with clean external DAC processing.
• Single Board Computers: Providing high-quality sound outputs for Raspberry Pi, BeagleBone, and Orange Pi multimedia setups.
• DIY Audio Amplifiers: Serving as the front-end digital decoding stage for custom headphone amplifiers and boomboxes.

Applications:

• Audiophile Headphone Listening: Driving low-impedance headphones with high dynamic range and reduced background hiss.
• Home Theater Interfacing: Delivering digital optical S/PDIF audio streams to AV receivers and surround sound processors.
• Studio Monitoring & Podcasting: Providing reliable stereo playback for desktop production, streaming, and recording monitors.

Equivalent Models:

• PCM2706 USB DAC Board: Similar architecture featuring I2S digital output support alongside standard analog outputs.
• CM108 USB Audio Module: Budget alternative USB audio solution offering integrated microphone input capabilities.
• SA9023 + ES9018K2M DAC: High-performance alternative decoder board offering 24-bit/96kHz high-resolution audio processing.

Package Includes:

• 1 x 5V USB Powered PCM2704 MINI USB Sound Card DAC Decoder Board