Texas Instruments DEM-PCM2912 EVM User Manual
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Texas Instruments DEM-PCM2912 EVM User Manual

Texas Instruments DEM-PCM2912 EVM User Manual

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DEM-PCM2912 EVM
User's Guide
March 2008
AIP Consumer Audio—TI Japan
SBAU132

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Summary of Contents for Texas Instruments DEM-PCM2912 EVM

  • Page 1 DEM-PCM2912 EVM User's Guide March 2008 AIP Consumer Audio—TI Japan SBAU132...
  • Page 2 SBAU132 – March 2008 Submit Documentation Feedback...

  • Page 3: Table Of Contents

    Contents ..........................Preface ........................ Description ..................Introduction—PCM2912 ....................1.1.1 Key Features ..............Pin Assignments and Terminal Functions ..................Functional Block Diagram ......................Getting Started ................Electrostatic Discharge Warning ..................... Block Diagram ..................Interface and Connections ......................Set-Up Guide ..............Basic Operating Set-Up—Windows Vista .................
  • Page 4 Audio Midi Setting Window (Mac OS) ........DEM-PCM2912 EVM Configuration for Playback Performance Measurement ..DEM-PCM2912 EVM Configuration for Recording Performance Measurement when Recording Data ..DEM-PCM2912 EVM Configuration for Recording Performance Measurement with Recorded Data ..................DEM-PCM2912 EVM Schematic ..............
  • Page 5 List of Tables .................... PCM2912 Terminal Functions ..................DEM-PCM2912 EVM Connectors ..................Line Output Playback Performance ..............32-Ω Headphone Output Playback Performance ..............16-Ω Headphone Output Playback Performance ..................Line Input Recording Performance ......................Bill of Materials SBAU132 – March 2008...
  • Page 6 List of Tables SBAU132 – March 2008 Submit Documentation Feedback...

  • Page 7: Preface

    SBAU132 – March 2008 Read This First About This Manual This document provides the information needed to set up and operate the DEM-PCM2912 EVM evaluation module, a test platform for the 16-bit, mono microphone input and stereo headphone output, single-chip PCM2912 stereo audio coder/decoder (codec) with a universal serial bus (USB) interface.
  • Page 8 User’s Guide. Newer revisions may be available from the TI web site at http://www.ti.com/ call the Texas Instruments Literature Response Center at (800) 477–8924 or the Product Information Center at (972) 644–5580. When ordering, identify the document(s) by both title and literature number.

  • Page 9: Description

    USB interface. All necessary connectors and circuitry are provided for interfacing to audio test systems and commercial audio equipment. A USB connector is mounted on the DEM-PCM2912 EVM. Stereo audio output and mono audio input are available on two stereo mini-jacks....................

  • Page 10: Introduction-Pcm2912

    www.ti.com Introduction—PCM2912 Introduction—PCM2912 The PCM2912 is an audio codec with a USB interface for a USB headset, USB headphones, and a USB audio interface box that integrates mono input, stereo headphone output, an analog loopback line, a programmable gain amplifier (PGA), and microphone bias. It is available in a 32-pin TQFP package.

  • Page 11: Pin Assignments And Terminal Functions

    www.ti.com Pin Assignments and Terminal Functions Pin Assignments and Terminal Functions Figure 1-1 shows the pin assignments for the PCM2912. Table 1-1 lists the terminal functions. PCM2912PJT (Top View) PGND TEST1 AGND TEST0 PCM2912PJT (32-pin TQFP) SSPND COM2 MMUTE COM1 PLAY Figure 1-1.
  • Page 12 www.ti.com Pin Assignments and Terminal Functions Table 1-1. PCM2912 Terminal Functions (continued) TQFP-36 Name Terminal Description -– Analog power supply for headphone amplifier of R-channel Headphone output for R-channel MAMP Microphone preamplifier gain control (LOW: Preamplifier off; HIGH: Preamplifier on = +20 POWER Power consumption declaration select pin (LOW: 100 mA;...

  • Page 13: Functional Block Diagram

    Functional Block Diagram Functional Block Diagram Figure 1-2 illustrates the functional block diagram of the DEM-PCM2912 EVM. BGND AGND/HGND/PGND/DGND Power SSPND 5 V to 3.3 V Manager Voltage Regulator PGA +30 dB to MBIAS Bias 12 dB in 1-dB steps...
  • Page 14 Description SBAU132 – March 2008 Submit Documentation Feedback...

  • Page 15: Getting Started

    Chapter 2 SBAU132 – March 2008 Getting Started This chapter provides information regarding handling and unpacking the DEM-PCM2912 EVM, as well as the EVM absolute operating conditions and a description of the factory default switch and jumper configurations....................Topic Page ..........

  • Page 16: Electrostatic Discharge Warning

    Electrostatic Discharge Warning Electrostatic Discharge Warning Many of the components on the DEM-PCM2912 EVM are susceptible to damage by electrostatic discharge (ESD). Customers are advised to observe proper ESD handling precautions when unpacking and handling the EVM, including the use of a grounded wrist strap at an approved ESD workstation.

  • Page 17: Set-Up Guide

    Chapter 3 SBAU132 – March 2008 Set-Up Guide This chapter discusses how to set up the DEM-PCM2912 EVM on personal computers (PCs) equipped with any of a variety of major operating systems, including Microsoft Windows Vista , Windows XP , and ®...

  • Page 18: Basic Operating Set-Up-Windows Vista

    Basic Operating Set-Up—Windows Vista Basic Operating Set-Up—Windows Vista This section reviews how to set up the DEM-PCM2912 EVM for use with a PC equipped with the Microsoft Vista Basic (or higher) operating system. When the installation is complete, the EVM software is ready to use.

  • Page 19: Volume And Mute Settings

    www.ti.com Basic Operating Set-Up—Windows Vista 3.1.2 Volume and Mute Settings Follow these steps to configure the volume settings for headphones, microphone, and the recording options. To set the headphone volume: Step 1. Open the Sound options from the Control Panel. (Start→Control Panel→Sound) Step 2.

  • Page 20: Microphone Properties-Levels Tab (Windows Vista)

    www.ti.com Basic Operating Set-Up—Windows Vista To set the record volume: Step 1. Open the Sound options from the Control Panel. (Start→Control Panel→Sound) Step 2. Open the microphone properties of the USB audio codec from the Sound options and select the Levels tab, as Figure 3-4 illustrates.

  • Page 21: Sampling Frequency

    www.ti.com Basic Operating Set-Up—Windows Vista 3.1.3 Sampling Frequency Under the Windows Vista operating system, it is necessary to select a specific sampling frequency because the sampling frequency cannot be changed on nearly all application software. To set the DAC sampling frequency: 1.

  • Page 22: Microphone Properties-Advanced Tab (Windows Vista)

    www.ti.com Basic Operating Set-Up—Windows Vista To set the ADC sampling frequency: 1. Open the Sound options from the Control Panel. (Start→Control Panel→Sound) 2. Open the microphone properties of the USB audio codec from the Sound options and select the Advanced tab, as Figure 3-6 illustrates.

  • Page 23: Basic Operating Set-Up-Windows Xp

    Basic Operating Set-Up—Windows XP Basic Operating Set-Up—Windows XP This section reviews how to set up the DEM-PCM2912 EVM for use with a PC equipped with the Microsoft XP (including Service Pack 2 updates) operating system. When the installation is complete, the EVM software is ready to use.

  • Page 24: Volume Settings

    www.ti.com Basic Operating Set-Up—Windows XP 3.2.2 Volume Settings Follow these steps to configure the volume settings for headphones, microphone, and the recording options. To set the headphone volume: Step 1. Open the Sound options from the Control Panel. (Start→Control Panel→Sound) Step 2.

  • Page 25: Speaker Window For Volume Setting (Windows Xp)

    www.ti.com Basic Operating Set-Up—Windows XP To set the microphone sidetone: 1. Open the Speakers options from the Volume selection box (on the Audio tab) or the Advanced selection box (on the Volume tab); see Figure 3-8. Alternatively, double-click the speaker icon (if displayed) in the lower right-hand area of the Windows taskbar (at the bottom of the screen);...

  • Page 26: Microphone Volume Windows For Record Volume Setting (Windows Xp)

    www.ti.com Basic Operating Set-Up—Windows XP space 3. Set the microphone volume and the recording mute level from –12 dB to +30 dB, as shown in Figure 3-11. The initial volume setting upon installation is approximately +8 dB. Figure 3-11. Microphone Volume Windows for Record Volume Setting (Windows XP) After this process is complete, the system volume setting for each component is maintained even if EVM is plugged in/out.

  • Page 27: Basic Operating Set-Up-Mac Os

    Basic Operating Set-Up—Mac OS Basic Operating Set-Up—Mac OS This section reviews how to set up the DEM-PCM2912 EVM for use with a Macintosh computer equipped with the Mac OS X (or later) operating system. When the installation is complete, the EVM software is ready to use.

  • Page 28: Sound-Output Tab (Mac Os)

    Step 4. Select the Output tab and confirm the USB audio codec appearance as the default playback device, as shown in Figure 3-13. Figure 3-13. Sound—Output Tab (Mac OS) This process confirms the proper recognition of the DEM-PCM2912 EVM by Mac OS X. Set-Up Guide SBAU132 – March 2008 Submit Documentation Feedback...

  • Page 29: Volume Settings

    www.ti.com Basic Operating Set-Up—Mac OS 3.3.2 Volume Settings Follow these steps to configure the volume settings for headphones, microphone, and the recording options. To set the headphone volume: Step 1. Open the Audio MIDI Settings options (Application→Utility→Set Audio MIDI), as illustrated in Figure 3-14.

  • Page 30: Sampling Frequency

    www.ti.com Basic Operating Set-Up—Mac OS To set the microphone sidetone: The volume setting of the microphone sidetone is controlled by the individual application software on the Mac. For example, Audio Recording using QuickTime (as shown in Figure 3-15) sets the ®...

  • Page 31: Audio Midi Setting Window (Mac Os)

    www.ti.com Basic Operating Set-Up—Mac OS Figure 3-16. Audio Midi Setting Window (Mac OS) SBAU132 – March 2008 Set-Up Guide Submit Documentation Feedback...
  • Page 32 Set-Up Guide SBAU132 – March 2008 Submit Documentation Feedback...

  • Page 33: Evaluation And Measurements

    Chapter 4 SBAU132 – March 2008 Evaluation and Measurements This chapter discusses how to set up the DEM-PCM2912 EVM for performance evaluation using the Audio Precision SYS-2722 audio analyzer. The process of measuring dynamic characteristics is then ® presented, along with example characteristic data.

  • Page 34: Measurements For Dynamic Characteristics

    • Power supply: V = 5.0 V (Bus power setting) • Temperature: Room/ambient Playback Performance The DEM-PCM2912 EVM performance presented in this section was obtained under the following conditions: • f = 44.1 kHz • Output PGA (Speaker output volume): 0 dB •...

  • Page 35: Line Output Playback Performance

    www.ti.com Playback Performance Table 4-1. Line Output Playback Performance Power Supply Performance Filter Setting 5.0 V THD+N (0 dBFS at 400 Hz to 20 kHz 10 kΩ 0.0086% 0.0085% 1 kHz) Pre-Anlr SNR (BPZ input) 400 Hz to 20 kHz 10 kΩ...

  • Page 36: Recording Performance

    Recording Performance Recording Performance The DEM-PCM2912 EVM playback performance presented in this section was obtained under the following conditions: • f = 44.1 kHz • Input PGA (Microphone input volume): 0 dB • Jumper setting: set JP1 to 100 mA and JP2 to 0 dB •...

  • Page 37: Schematic, Pcb Layout, And Bill Of Materials

    Chapter 5 SBAU132 – March 2008 Schematic, PCB Layout, and Bill of Materials This chapter provides the electrical and physical layout information for the DEM-PCM2912 EVM. The bill of materials is included for component and manufacturer reference. Note: Board layouts are not to scale. These are intended to show how the board is laid out; they are not intended to be used for manufacturing DEM-PCM2912 EVM PCBs.

  • Page 38: Schematics

    Schematics Schematics The schematic for the DEM-PCM2912 EVM is shown in Figure 5-1. Figure 5-1. DEM-PCM2912 EVM Schematic Schematic, PCB Layout, and Bill of Materials SBAU132 – March 2008 Submit Documentation Feedback...

  • Page 39: Printed Circuit Board Layout

    Printed Circuit Board Layout Figure 5-2 through Figure 5-4 illustrate the printed circuit board (PCB) layout for the DEM-PCM2912 EVM. Figure 5-2. DEM-PCM2912 EVM Board Layout—Silkscreen Figure 5-3. DEM-PCM2912 EVM Board Layout—Component Side Figure 5-4. DEM-PCM2912 EVM Board Layout—Inner View SBAU132 –...

  • Page 40: Component List

    Component List Component List Table 5-1 lists the bill of materials for the DEM-PCM2912 EVM. Table 5-1. Bill of Materials Reference Designator Value Value2 Manufacturer Mfr Part No Remarks 22 pF 50 V, 5% Taiyoyuden UMK107CH220JZ 22 pF 50 V, 5%...
  • Page 41 www.ti.com Component List Table 5-1. Bill of Materials (continued) Reference Designator Value Value2 Manufacturer Mfr Part No Remarks TP1, Check pin Mac8 HK-4-S TP4–TP5, TP12–TP15 TP2–TP3, Check pin Mac8 HK-6-S TP6–TP11 SBAU132 – March 2008 Schematic, PCB Layout, and Bill of Materials Submit Documentation Feedback...

  • Page 42: Important Notices

    EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
  • Page 43 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.

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