SBFS036B May   2015  – August 2015 PCM2704C , PCM2705C , PCM2706C

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information: PCM2704C, PCM2705C
    5. 7.5  Thermal Information: PCM2706C, PCM2707C
    6. 7.6  Electrical Characteristics: PCM2704CDB, PCM2705CDB, PCM2706CPJT, PCM2707CPJT
    7. 7.7  Audio Interface Timing Characteristics
    8. 7.8  Audio Clock Timing Characteristics
    9. 7.9  External ROM Read Interface Timing Characteristics
    10. 7.10 SPI Timing Characteristics
    11. 7.11 Typical Characteristics
      1. 7.11.1 Internal Filter: DAC Digital Interpolation Filter Frequency Response
      2. 7.11.2 Internal Filter: DAC Analog Low-Pass Filter Frequency Response
      3. 7.11.3 General Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagrams
    3. 9.3 Feature Description
      1. 9.3.1  Clock and Reset
      2. 9.3.2  Operation Mode Selection
        1. 9.3.2.1 Power Configuration Select/Host Detection
        2. 9.3.2.2 Function Select (PCM2706C/7C Only)
      3. 9.3.3  DAC
      4. 9.3.4  Digital Audio Interface: S/PDIF Output
        1. 9.3.4.1 Channel Status Information
        2. 9.3.4.2 Copyright Management
      5. 9.3.5  Digital Audio Interface: I2S Interface Output (PCM2706C/7C)
      6. 9.3.6  Descriptor Data Modification
      7. 9.3.7  External ROM Descriptor (PCM2704C/6C)
      8. 9.3.8  External ROM Example
      9. 9.3.9  Serial Programming Interface (PCM2705C/7C)
      10. 9.3.10 USB Host Interface Sequence
        1. 9.3.10.1 Power-On, Attach, and Playback Sequence
        2. 9.3.10.2 Play, Stop, and Detach Sequence
        3. 9.3.10.3 Suspend and Resume Sequence
      11. 9.3.11 Operating Environment
    4. 9.4 Device Functional Modes
    5. 9.5 Programming
      1. 9.5.1 USB Interface
        1. 9.5.1.1 Device Configuration
        2. 9.5.1.2 Interface Number 0 (Default/Control Interface)
        3. 9.5.1.3 Interface Number 1 (Isochronous-Out Interface)
        4. 9.5.1.4 Interface Number 2 (HID Interface)
          1. 9.5.1.4.1 HID Items Reported
            1. 9.5.1.4.1.1 Basic HID Operation
            2. 9.5.1.4.1.2 Extended HID Operation (PCM2705/6/7)
            3. 9.5.1.4.1.3 Auxiliary HID Status Report (PCM2705C/7C)
        5. 9.5.1.5 Endpoints
    6. 9.6 Register Maps
      1. 9.6.1 SPI Register (PCM2705C/7C)
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Typical Circuit Connection 1: USB Speaker
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Typical Circuit Connection 2: Remote Headphone
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
        3. 10.2.2.3 Application Curves
      3. 10.2.3 Typical Circuit Connection 3: DSP Surround Processing Amplifier
        1. 10.2.3.1 Design Requirements
        2. 10.2.3.2 Detailed Design Procedure
        3. 10.2.3.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Related Links
    3. 13.3 Community Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • On-Chip USB Interface:
    • No Dedicated Device Driver Needed
    • Full-Speed Transceivers
    • Fully Compliant With USB 2.0 Specification
      • USB 1.1 Descriptors With USB Audio Class Support
    • Certified by USB-IF
    • Partially Programmable Descriptors
    • Adaptive Isochronous Transfer for Playback
    • Bus-Powered or Self-Powered Operation
  • Sampling Rates: 32 kHz, 44.1 kHz, and 48 kHz
  • On-Chip Clock Generator With Single 12-MHz Clock Source
  • Single Power Supply:
    • Bus-Powered: 5 V, Typical (VBUS)
    • Self-Powered: 3.3 V, Typical
  • 16-Bit Delta-Sigma Stereo DAC
    • Analog Performance at 5 V (Bus-Powered),
      3.3 V (Self-Powered):
      • THD + N: 0.006% RL > 10 kΩ, Self-Powered
      • THD + N: 0.025% RL = 32 Ω
      • SNR = 98 dB
      • Dynamic Range: 98 dB
      • PO = 12 mW, RL = 32 Ω
    • Oversampling Digital Filter
      • Passband Ripple = ±0.04 dB
      • Stop-Band Attenuation = –50 dB
    • Single-Ended Voltage Output
    • Analog LPF Included
  • 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/6C)
    • Serial Programming Interface (PCM2705C/7C)
    • I2S Interface (Selectable on PCM2706C/7C)

2 Applications

  • USB Headphones
  • USB Audio Speaker
  • USB CRT/LCD Monitor
  • USB Audio Interface Box
  • USB-Featured Consumer Audio Product

3 Description

The PCM270xC are TI's single-chip USB stereo audio digital-to-analog converters (DACs) with USB 2.0 compliant full-speed protocol controller and S/PDIF. The USB-protocol controller 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 and PCM2706C) or serial peripheral interface (SPI) (PCM2705C and PCM2707C). The PCM270xC also employ SpAct™ architecture, TI's unique 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.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
PCM2704C SSOP (28) 5.30 mm × 10.20 mm
PCM2705C
PCM2706C TQFP (32) 7.00 mm × 7.00 mm
PCM2707C
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Block Diagram

PCM2704C PCM2705C PCM2706C PCM2707C Block_Diagram.gif

4 Revision History

Changes from A Revision (July 2012) to B Revision

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

Changes from * Revision (August 2011) to A Revision

  • Changed product status from Mixed Status to Production DataGo
  • Changed Features section to show full compliance with USB2.0 Specification (but still using USB1.1 descriptors)Go
  • Changed Description section to show USB2.0 compliance (USB1.1 was absorbed into 2.0 specification)Go