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Home » NEWEST Products » New by Manufacturer » Texas Instruments » PCM270xC USB Stereo Audio DACs - TI
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Texas Instruments PCM270xC USB Stereo Audio DACs

Texas Instruments PCM270xC USB Stereo Audio DACs

Texas Instruments PCM270xC single-chip USB stereo audio digital-to-analog converters (DACs) feature a USB-compliant full-speed protocol controller and S/PDIF. The USB-protocol controller on these TI USB audio DACs works with no software code, but USB descriptors can be modified in some areas (for example, vendor ID/product ID) through the use of an external ROM (PCM2704C) or SPI™ (PCM2705C). TI PCM270xC USB audio DACs also employ SpAct™ architecture, a TI system that recovers the audio clock from USB packet data. On-chip analog phase-locked loops (PLLs) with SpAct enable playback with low clock jitter. These TI audio DACs are ideal for use in USB headphones, audio speakers, CRT/LCD monitors, and audio interface boxes.

Features
  • On-Chip USB Interface:
    • No Dedicated Device Driver Needed
    • Full-Speed Transceivers
    • Fully Compliant with USB 1.1 Specification
    • Certified by USB-IF
    • Partially Programmable Descriptors
    • Adaptive Isochronous Transfer for Playback
    • Bus-Powered or Self-Powered Operation
  • Sampling Rates: 32kHz, 44.1kHz, 48kHz
  • On-Chip Clock Generator with Single 12MHz Clock Source
  • Single Power Supply:
    • Bus-Powered: 5V, Typical (VBUS)
    • Self-Powered: 3.3V, Typical
  • 16-Bit Delta-Sigma Stereo DAC
    • Analog Performance at 5V (Bus-Powered), 3.3V (Self-Powered):
      • THD+N: 0.006% RL > 10kΩ, Self-Powered
      • THD+N: 0.025% RL = 32Ω
      • SNR = 98dB
      • Dynamic Range: 98dB
      • PO = 12 mW, RL = 32Ω
  • Multiple Functions:
    • Up to Eight Human Interface Device (HID) Interfaces (Model and Setting Dependent)
    • Suspend Flag
    • S/PDIF Out with SCMS
    • External ROM Interface (PCM2704C)
    • Serial Programming Interface (PCM2705C)
  • Packages: 28-Pin SSOP
Applications
  • USB Headphones
  • USB Audio Speaker
  • USB CRT/LCD Monitor
  • USB Audio Interface Box
  • USB-Featured Consumer Audio Product

Functional Block Diagram

Functional Block Diagram
  • Texas Instruments