Product details


Number of ADC channels 2 DAC channels 2 Analog inputs 2 Sampling rate (Max) (kHz) 48 Control interface HID Features 500mA Max Power Configuration Analog outputs 2 open-in-new Find other Audio USB converters

Package | Pins | Size

SSOP (DB) 28 54 mm² 5.30 x 10.20 open-in-new Find other Audio USB converters


  • PCM2904: Without S/PDIF
  • PCM2906: With S/PDIF
  • On-Chip USB Interface:
    • With Full-Speed Transceivers
    • Fully Compliant With USB 1.1 Specification
    • Certified by USB-IF
    • Partially Programmable Descriptors(1)
    • USB Adaptive Mode for Playback
    • USB Asynchronous Mode for Record
    • Bus Powered
  • 16-Bit Delta-Sigma ADC and DAC
  • Sampling Rate:
    • DAC: 32, 44.1, 48 kHz
    • ADC: 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz
  • On-Chip Clock Generator With Single 12-MHz Clock Source
  • Single Power Supply: 5 V Typical (VBUS)
  • Stereo ADC
    • Analog Performance at VBUS = 5 V
      • THD+N = 0.01%
      • SNR = 89 dB
      • Dynamic Range = 89 dB
    • Decimation Digital Filter
      • Pass-Band Ripple = ±0.05 dB
      • Stop-Band Attenuation = -65 dB
    • Single-Ended Voltage Input
    • Antialiasing Filter Included
    • Digital LCF Included
  • Stereo DAC:
    • Analog Performance at VBUS = 5 V
      • THD+N = 0.005%
      • SNR = 96 dB
      • Dynamic Range = 93 dB
    • Oversampling Digital Filter
      • Pass-Band Ripple = ±0.1 dB
      • Stop-Band Attenuation = -43 dB
    • Single-Ended Voltage Output
    • Analog LPF Included
  • Multifunctions:
    • Human Interface Device (HID) Volume ± Control and Mute Control
    • Suspend Flag
  • Package: 28-Pin SSOP
    • USB Audio Speaker
    • USB Headset
    • USB Monitor
    • USB Audio Interface Box

(1)The descriptor can be modified by changing a mask.

SpAct is a trademark of Texas Instruments.
System Two, Audio Precision are trademarks of Audio Precision, Inc.

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The PCM2904/2906 is Texas Instruments single-chip USB stereo audio codec with USB-compliant full-speed protocol controller and S/PDIF (PCM2906 only). The USB protocol controller works with no software code, but the USB descriptors can be modified in some areas (for example, vendor ID/product ID). The PCM2904/2906 employs SpAct™ architecture, TI's unique system that recovers the audio clock from USB packet data. On-chip analog PLLs with SpAct enable playback and record with low clock jitter and with independent playback and record sampling rates.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet Stereo Audio CODEC with USB Interface, Single-Ended Analog Input/Output and S/PD datasheet (Rev. C) Nov. 09, 2007
* Errata PCM290x Errata (Rev. A) May 30, 2008
* Errata Updated Operating Environments for PCM270x, PCM290x Applications Oct. 19, 2007
Application notes Key Differences Between the PCM290x and PCM290xC Sep. 14, 2011
Application notes Solving Enumeration Errors in USB Audio DAC and CODEC Designs Oct. 30, 2009
More literature PCM2906B Read-Me-First Letter: PCM2906B and PCM2906 Difference Jan. 24, 2009
User guides USB Audio Filter Driver Installation Dec. 19, 2008
Application notes Dynamic Performance Testing of Digital Audio D/A Converters Oct. 02, 2000

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