The VIA Envy VT1728A is a USB, 24-bit/192KHz audio controller specifically designed to achieve cinema-quality audio recording and playback in high fidelity USB and MIDI system applications. Delivering high end sound for audio enthusiasts, the VT1728A supports the most popular digital audio sampling resolutions and an HD audio interface for rich audio experience.

The highly integrated single chip USB audio solution is embedded with a number of crucial modules, including a standard 8032 MCU core, USB Transceiver, two I2C master and one slave controller, an I2S controller, a serial flash controller, an SPI port, phase-locked loop (PLLs) with internal oscillator, and built-in 5 V ~ 3.3 V and 5 V ~ 2.0 V regulator.

The VT1728A also supports multi-channel PCM digital audio format up to 24-bit resolution and 192 kHz sample rate as well as multiple audio bit streams of up to 2 Input Streams and 2 Output Streams. Additionally, the I2S interface of the VT1728A is capable of supporting various customized configurations. An S/PDIF TX audio interface with one stereo output port and one stereo input port also supports up to a 24-bit resolution and 192 kHz sample rate.

Feature Highlights

  • USB Interface
    • USB 2.0 Full-Speed (12 Mbps) Device Compliant
    • USB 2.0 High-Speed PHY Integrated
    • USB Audio Class v1.0 Device Compliant
    • USB Device Firmware Upgrade v1.1 Compliant
  • I2S Audio Interface
    • 1 I2S audio interface (shared with HD)
      • Mono/ 2-Ch
      • 16/20/24-bit
      • Supports 44.1/48/88.2/96/176.4/192kHz sample rates
  • HD Audio Link Interface
    • 1 HD audio link interface (shared with I2S)
      • Mono / 2,6,8-Ch
      • 16/20/24-bit
      • Supports 44.1/48/96/192kHz sample rates
  • S/PDIF Interface
    • 1 S/PDIF TX audio interface
      • Mono / 2-Ch
      • 16 / 20 / 24-bit
      • Supports 44.1/48/88.2 /96/176.4/192kHz sample rates

VT1728A Block Diagram


VIA Technologies, Inc.