PCM2912A Audio Codec With USB Interface, Mono Microphone Input and Stereo Headphone Output

1 Features

• On-Chip USB Interface:
  • With Full-Speed Transceivers
  • Fully Compliant With USB 2.0 Specification
  • Certified By USB-IF
  • Partially Programmable Descriptors
  • Adaptive Isochronous Transfer for Playback
  • Asynchronous-Isochronous Transfer for Record
  • Bus Powered
• 16-Bit Delta-Sigma ADC and DAC
• Sampling Rate:
  • 8, 11.025, 16, 22.05, 32, 44.1, or 48 kHz
• On-Chip Clock Generator:
  • With Single 6-MHz Clock Source
• Mono ADC with Microphone Input
  • Analog Performance at V_BUS = 5 V:
    • THD+N: 0.01%
    • SNR: 92 dB
    • Dynamic Range: 90 dB
  • Decimation Digital Filter
    • Passband Ripple: ±0.05 dB
    • Stop-Band Attenuation: –65 dB
  • Single-Ended Voltage Input
  • Antialiasing Filter Included
  • Digital HPF Included
  • Microphone Bias, Microphone Amplifier, and Input PGA
• Stereo DAC With Headphone Output
  • Analog Performance at V_BUS = 5.0 V:
    • THD+N: 0.01% (R_L > 10 kΩ)
    • THD+N: 0.02% (R_L = 32 Ω)
    • SNR: 92 dB
    • Dynamic Range: 90 dB
    • PO: 13 mW (R_L = 32 Ω)
    • PO: 25 mW (R_L = 16 Ω)
  • Oversampling Digital Filter
    • Passband Ripple: ±0.1 dB
    • Stop-Band Attenuation: –43 dB
    • Single-Ended Voltage Output
    • Analog LPF Included
    • Sidetone PGA, Output PGA, and HP Amplifier
• Multifunctions:
  • Suspend, Playback, and Record Status Flag
  • Microphone Amplifier, Mute, and Gain Control
• Pop/Click Noise-Free
• Single Power-Supply: 5 V Typical (V_BUS)
• Package: 32-Pin TQFP

2 Applications

• USB Headset
• USB Headphone
• USB Speaker
• USB Featured Consumer Audio Product
• USB Audio Interface Box
• USB Monitor
• Video Conference System

3 Description

The PCM2912A is the Texas Instruments single-chip, USB stereo audio codec with a USB, 2.0-compliant, full-speed protocol controller and an analog front-end (AFE) function for headset applications.

The USB protocol controller works with no software code, but USB descriptors can be modified on request. The PCM2912A employs SpAct™ architecture, TI’s unique system that recovers the audio clock from USB packet data. On-chip analog PLLs with SpAct enables independent playback and record sampling rates with low clock jitters.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Block Diagram

4 Revision History

Changes from * Revision (September 2008) to A Revision

• Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, Device Comparison table, and Mechanical, Packaging, and Orderable Information section Go

5 Device Comparison Table