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

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10 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

10.1 Application Information

The PSEL allows the device to configure for bus-powered mode (High) or self-powered mode (Low). The HOST pin configures the maximum current consumption of the device during bus-powered mode (low: 100 mA, high: 500 mA), or can be used as host detector during self-powered mode. The SSPND flag notifies when the USB input is idle for at least 5 ms; this flag can be used to control or notify subsequent circuits. The device descriptor can be modified by using an external ROM (PCM2704C/6C) or through the SPI port (PCM2705C/7C); this descriptor programming function is only available when PSEL and HOST are high. More functional details can be found in USB Interface.

10.2 Typical Application

10.2.1 Typical Circuit Connection 1: USB Speaker

Figure 35 shows a typical circuit connection for an internal-descriptor, bus-powered, 500-mA application.

PCM2704C PCM2705C PCM2706C PCM2707C ai_ex_usb_spkr_bfs036.gif

NOINDENT:

NOTE: X1: 12-MHz crystal resonator. C1, C2: 10- to 33-pF capacitors (depending on load capacitance of crystal resonator). C3to C7: 1-μF ceramic capacitors. C8: 10-μF electrolytic capacitor. C9, C10: 100-μF electrolytic capacitors (depending on tradeoff between required frequency response and discharge time for resume). C11, C12: 0.022-μF ceramic capacitors. C13, C14: 1-μF electrolytic capacitors. R1: 1-MΩ resistor. R2, R9: 1.5-kΩ resistors. R3, R4: 22-Ω resistors. R5, R6: 16-Ω resistors. R7, R8: 330-Ω resistors (depending on tradeoff between required THD performance and pop-noise level for suspend).
1.

NOINDENT:

Output impedance of VOUTL and VOUTR during suspended mode or lack of power supply is 26 kΩ ±20%, which is the discharge path for C9 and C10.
2.

NOINDENT:

Descriptor programming through external ROM is only available when PSEL and HOST are high.
3.

NOINDENT:

External ROM power can be supplied from VCCP, but any other active component must not use VCCP, VCCL, VCCR, or VDD as a power source.
Figure 35. Bus-Powered Application

NOTE

The circuit shown in Figure 35 is for information only. The entire board design should be considered to meet the USB specification as a USB-compliant product.

10.2.1.1 Design Requirements

For this design example, use the parameters listed in Table 10.

Table 10. Design Parameters

DESIGN PARAMETER EXAMPLE VALUE
Input voltage range 4.35 V to 5.25 V (USB power)
Current 500 mA (Bus-Powered Max power)
Input clock frequency 11.994 MHz to 12.006 MHz

10.2.1.2 Detailed Design Procedure

The PCM2704C/5C/6C/7C is a simple design device that can connect directly to a USB port. Only a 3.3-V external regulator is needed (in self-powered mode), and an external ROM for the descriptor programming function (PCM2704C/6C). The switches connected to the HID ports must be normally open. TI recommends placing an output filter such as the one shown in Figure 35. The PCM2704C/5C/6C/7C requires decoupling capacitors on the voltage source pins.

10.2.1.3 Application Curves

For the application curves, see the graphs listed in Table 11.

Table 11. Table of Graphs

FIGURE
DAC Digital Interpolation Filter Frequency Response Frequency Response Figure 6
Passband Ripple Figure 7
DAC Analog Low-Pass Filter Frequency Response Passband Characteristics Figure 8
Stop Band Characteristics Figure 9

10.2.2 Typical Circuit Connection 2: Remote Headphone

Figure 36 shows a typical circuit connection for a bus-powered, 100-mA headphone with seven HIDs.

PCM2704C PCM2705C PCM2706C PCM2707C ai_ex_headphone_bfs036.gif

NOINDENT:

NOTE: X1: 12-MHz crystal resonator. C1, C2: 10- to 33-pF capacitors (depending on load capacitance of crystal resonator). C3 to C5, C7, C8: 1-μF ceramic capacitors. C6: 10-μF electrolytic capacitor. C9, C10: 100-μF electrolytic capacitors (depending on required frequency response). C11, C12: 0.022-μF ceramic capacitors. R1: 1-MΩ resistor. R2, R11: 1.5-kΩ resistors. R3, R4: 22-Ω resistors. R5, R6: 16-Ω resistors. R7 to R10: 3.3-kΩ resistors.
1.

NOINDENT:

Output impedance of VOUTL and VOUTR during suspend mode or lack of power supply is 26 kΩ ±20%, which is the discharge path for C9 and C10.
2.

NOINDENT:

Descriptor programming through external ROM is only available when PSEL and HOST are high.
3.

NOINDENT:

External ROM power can be supplied from VCCP, but any other active component must not use VCCP, VCCL, VCCR, or VDD as a power source.
Figure 36. Bus-Powered Application

NOTE

The circuit shown in Figure 36 is for information only. The entire board design should be considered to meet the USB specification as a USB-compliant product.

10.2.2.1 Design Requirements

For this design example, use the parameters listed in Table 12.

Table 12. Design Parameters

DESIGN PARAMETER EXAMPLE VALUE
Input voltage range 4.35 V to 5.25 V (USB power)
Current 100 mA (Bus-Powered Max power)
Input clock frequency 11.994 MHz to 12.006 MHz

10.2.2.2 Detailed Design Procedure

A general detailed design procedure is explained in Detailed Design Procedure.

10.2.2.3 Application Curves

For the application curves, see the graphs listed in Table 11.

10.2.3 Typical Circuit Connection 3: DSP Surround Processing Amplifier

Figure 37 shows a typical circuit connection for an I2S- and SPI-enabled self-powered application.

PCM2704C PCM2705C PCM2706C PCM2707C ai_ex_dsp_surround_bfs036.gif

NOINDENT:

NOTE: X1: 12-MHz crystal resonator. C1, C2: 10- to 33-pF capacitors (depending on load capacitance of crystal resonator). C3, C4: 1-μF ceramic capacitors. C5, C7: 0.1-μF ceramic capacitor and 10-μF electrolytic capacitor. C6: 10-μF electrolytic capacitors. C8, C9: 100-μF electrolytic capacitors (depending on required frequency response). C10, C11: 0.022-μF ceramic capacitors. R1, R12: 1-MΩ resistors. R2, R5: 1.5-kΩ resistors. R3, R4: 22-Ω resistors. R6, R7: 16-Ω resistors. R8to R11: 3.3-kΩ resistors.
1.

NOINDENT:

Output impedance of VOUTL and VOUTR during suspend mode or lack of power supply is 26 kΩ ±20%, which is the discharge path for C8 and C9.
2.

NOINDENT:

Descriptor programming through SPI is only available when PSEL and HOST are high.
3.

NOINDENT:

D+ pullup must not be activated (high: 3.3 V) while the device is detached from USB or power supply is not applied on VDD and VCCx. VBUS of USB (5 V) can be used to detect USB power status.
4.

NOINDENT:

MS must be high until the PCM2707C power supply is ready and the SPI host (the DSP) is ready to send data. Also, the SPI host must handle the D+ pullup if the descriptor is programmed through the SPI. D+ pullup must not be activated (high = 3.3 V) before programming of the PCM2707C through the SPI is complete.
Figure 37. Self-Powered Application

NOTE

The circuit shown in Figure 37 is for information only. The entire board design should be considered to meet the USB specification as a USB-compliant product.

10.2.3.1 Design Requirements

For this design example, use the parameters listed in Table 13.

Table 13. Design Parameters

DESIGN PARAMETER EXAMPLE VALUE
Input voltage range 3 V to 3.6 V
Current 100 mA
Input clock frequency 11.994 MHz to 12.006 MHz

10.2.3.2 Detailed Design Procedure

A general detailed design procedure is explained in Detailed Design Procedure.

10.2.3.3 Application Curves

For the application curves, see the graphs listed in Table 11.
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