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Texas Instruments DEM-PCM2912A EVM manuel d'utilisation

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Table des matières du manuel d’utilisation

  • Page 1

    DEM-PCM2912A EVM User's Guide Literature Number: SBAU141 January 2009[...]

  • Page 2

    2 SBAU141 – January 2009 Submit Documentation Feedback[...]

  • Page 3

    Contents Preface ............................................................................................................................... 7 1 Description ................................................................................................................ 9 1.1 Introduction—PCM2912A ..............................................[...]

  • Page 4

    www.ti.com List of Figures 1-1 PCM2912A Pin Assignments ............................................................................................. 11 1-2 DEM-PCM2912A EVM Functional Block Diagram ..................................................................... 13 2-1 DEM-PCM2912A EVM Block Diagram ...........................................[...]

  • Page 5

    www.ti.com List of Tables 1-1 PCM2912A Terminal Functions .......................................................................................... 11 2-1 DEM-PCM2912A EVM Connectors ...................................................................................... 16 4-1 Line Output Playback Performance .......................................[...]

  • Page 6

    List of Tables 6 SBAU141 – January 2009 Submit Documentation Feedback[...]

  • Page 7

    Preface SBAU141 – January 2009 Read This First About This Manual This document provides the information needed to set up and operate the DEM-PCM2912A EVM evaluation module, a test platform for the 16-bit, mono microphone input and stereo headphone output, single-chip PCM2912A stereo audio coder/decoder (codec) with a universal serial bus (USB) in[...]

  • Page 8

    Related Documentation From Texas Instruments www.ti.com Related Documentation From Texas Instruments The following documents provide information regarding Texas Instruments integrated circuits used in the assembly of the DEM-PCM2912A EVM. These documents are available from the TI web site . The last character of the literature number corresponds to[...]

  • Page 9

    Chapter 1 SBAU141 – January 2009 Description The DEM-PCM2912A EVM is a complete evaluation platform for the 16-bit, mono microphone input and stereo headphone output PCM2912A bus-powered audio codec with a USB interface. All necessary connectors and circuitry are provided for interfacing to audio test systems and commercial audio equipment. A USB[...]

  • Page 10

    1.1 Introduction—PCM2912A 1.1.1 Key Features Introduction—PCM2912A www.ti.com The PCM2912A 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[...]

  • Page 11

    1.2 Pin Assignments and Terminal Functions PCM2912APJT (32-pinTQFP) 1 24 2 23 3 22 4 21 5 20 6 19 7 18 8 17 9 32 10 31 11 30 12 29 13 28 14 27 15 26 16 25 PGND V IN V CCP V CCA TEST1 NC TEST0 AGND SSPND V COM2 MMUTE V COM1 REC FR PL A Y FL BGND V BU S D - D+ V DD DGND XTO XTI POWER MAMP V R OU T V CC R HGND V CCL V L O UT MBIAS PCM2912APJT (T op[...]

  • Page 12

    Pin Assignments and Terminal Functions www.ti.com Table 1-1. PCM2912A Terminal Functions (continued) TQFP-36 Name Terminal I/O Description V CCR 21 -– Analog power supply for headphone amplifier of R-channel V OUT R 22 O Headphone output for R-channel MAMP 23 I Microphone preamplifier gain control (LOW: Preamplifier off; HIGH: Preamplifier on = +[...]

  • Page 13

    1.3 Functional Block Diagram S S XTI XTO 6.000MHz 96MHz PLL(x16) T racker (SpAct ) â USBprotocol controller ISO-out endpoint Control endpoint ISO-in endpoint FIFO FIFO XCVR Selector Selector Analog PLL Analog PLL USBSIE V REF 5Vto3.3V V oltage Regulator Power Manager ADC DAC MIC Bias MIC Amp BGND V /V /V /V /V CCA CCP CC[...]

  • Page 14

    Description 14 SBAU141 – January 2009 Submit Documentation Feedback[...]

  • Page 15

    Chapter 2 SBAU141 – January 2009 Getting Started This chapter provides information regarding handling and unpacking the DEM-PCM2912A EVM, as well as the EVM absolute operating conditions and a description of the factory default switch and jumper configurations. Topic ................................................................................[...]

  • Page 16

    2.1 Electrostatic Discharge Warning 2.2 Block Diagram PC USB Connector D2 D1 SW1 JP1 J1 JP2 J2 PCM2912A PCM2912A-EVM Mic Headphone CN1 D+,D - PL A Y REC V IN V L/R OUT POWER MMUTE MAMP 2.3 Interface and Connections Electrostatic Discharge Warning www.ti.com Many of the components on the DEM-PCM2912A EVM are susceptible to damage by electrostatic[...]

  • Page 17

    Chapter 3 SBAU141 – January 2009 Set-Up Guide This chapter discusses how to set up the DEM-PCM2912A EVM on personal computers (PCs) equipped with any of a variety of major operating systems, including Microsoft Windows Vista ® , Windows XP ® , and Macintosh ® OS X and later. Topic ...............................................................[...]

  • Page 18

    3.1 Basic Operating Set-Up—Windows Vista 3.1.1 Basic Setup Before Evaluation Basic Operating Set-Up—Windows Vista www.ti.com This section reviews how to set up the DEM-PCM2912A 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. Follow t[...]

  • Page 19

    3.1.2 Volume and Mute Settings www.ti.com Basic Operating Set-Up—Windows Vista 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. Open the speaker properties of t[...]

  • Page 20

    Basic Operating Set-Up—Windows Vista www.ti.com 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. Step 3. Set the microphone volume and the [...]

  • Page 21

    3.1.3 Sampling Frequency www.ti.com Basic Operating Set-Up—Windows Vista 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. Open the Sound options from the Control Panel. ( Start[...]

  • Page 22

    Basic Operating Set-Up—Windows Vista www.ti.com 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. 3. Select the desired ADC sampling freque[...]

  • Page 23

    3.2 Basic Operating Set-Up—Windows XP 3.2.1 Basic Setup Before Evaluation www.ti.com Basic Operating Set-Up—Windows XP This section reviews how to set up the DEM-PCM2912A 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

    3.2.2 Volume Settings Basic Operating Set-Up—Windows XP www.ti.com 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. Open the Sound and Audio Devices Properties [...]

  • Page 25

    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 botto[...]

  • Page 26

    Basic Operating Set-Up—Windows XP www.ti.com 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 syste[...]

  • Page 27

    3.3 Basic Operating Set-Up—Mac OS 3.3.1 Basic Setup Before Evaluation www.ti.com Basic Operating Set-Up—Mac OS This section reviews how to set up the DEM-PCM2912A 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. Follow these steps t[...]

  • Page 28

    Basic Operating Set-Up—Mac OS www.ti.com space 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-PCM2912A EVM by Mac OS X. Set-Up Guide 28 SBAU141 – January 2009 Submit[...]

  • Page 29

    3.3.2 Volume Settings www.ti.com Basic Operating Set-Up—Mac OS 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 . Alternatively, open the [...]

  • Page 30

    3.3.3 Sampling Frequency Basic Operating Set-Up—Mac OS www.ti.com 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 microphone volume for sidetone from –76dB to 0dB. Fig[...]

  • Page 31

    www.ti.com Basic Operating Set-Up—Mac OS Figure 3-16. Audio Midi Setting Window (Mac OS) SBAU141 – January 2009 Set-Up Guide 31 Submit Documentation Feedback[...]

  • Page 32

    Set-Up Guide 32 SBAU141 – January 2009 Submit Documentation Feedback[...]

  • Page 33

    Chapter 4 SBAU141 – January 2009 Evaluation and Measurements This chapter discusses how to set up the DEM-PCM2912A 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. Topic ..................................[...]

  • Page 34

    4.1 Measurements for Dynamic Characteristics 4.2 Playback Performance PC Playingtestdataatf =44.1kHzbyapplicationsoftware (forexample,SoundRecorder ,MediaPlayer ,etc.) S USB Connector D2 D1 SW1 JP1 J1 JP2 J2 100mA 0dB PCM2912A PCM2912A-EVM Mic Headphone AudioPrecision SYS-2722 AnalogAnalyzer [...]

  • Page 35

    www.ti.com Playback Performance Table 4-1. Line Output Playback Performance Power Supply Performance Filter Setting R L V OUT L V OUT R 5.0 V THD+N (0 dBFS at 400 Hz to 20 kHz 10 k Ω 0.0086% 0.0085% 1 kHz) Pre-Anlr SNR (BPZ input) 400 Hz to 20 kHz 10 k Ω 92.1 dB 92.1 dB Pre-Anlr + A-weighting DR (–60 dBFS 400 Hz to 20 kHz 10 k Ω 90.3 dB 90.[...]

  • Page 36

    4.3 Recording Performance PC Recordingatf =44.1kHzbyapplicationsoftware (forexample,SoundRecorder ,QuickTime,etc.) S USB Connector D2 D1 SW1 JP1 J1 JP2 J2 100mA 0dB PCM2912A PCM2912A-EVM Mic Headphone AudioPrecision SYS-2722 AnalogGenerator Unbalanced FloatingGNDsetting AudioPrecision SYS-272[...]

  • Page 37

    Chapter 5 SBAU141 – January 2009 Schematic, PCB Layout, and Bill of Materials This chapter provides the electrical and physical layout information for the DEM-PCM2912A 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 ar[...]

  • Page 38

    5.1 Schematics Schematics www.ti.com The schematic for the DEM-PCM2912A EVM is shown in Figure 5-1 . Figure 5-1. DEM-PCM2912A EVM Schematic Schematic, PCB Layout, and Bill of Materials 38 SBAU141 – January 2009 Submit Documentation Feedback[...]

  • Page 39

    5.2 Printed Circuit Board Layout www.ti.com Printed Circuit Board Layout Figure 5-2 through Figure 5-4 illustrate the printed circuit board (PCB) layout for the DEM-PCM2912A EVM. Figure 5-2. DEM-PCM2912A EVM Board Layout—Silkscreen Figure 5-3. DEM-PCM2912A EVM Board Layout—Component Side Figure 5-4. DEM-PCM2912A EVM Board Layout—Inner View SB[...]

  • Page 40

    5.3 Component List Component List www.ti.com Table 5-1 lists the bill of materials for the DEM-PCM2912A EVM. Table 5-1. Bill of Materials Reference Designator Value Value2 Manufacturer Mfr Part No Remarks C1 22 pF 50 V, 5% Taiyoyuden UMK107CH220JZ C2 22 pF 50 V, 5% Taiyoyuden UMK107CH220JZ C4 100 pF 50 V, 5% Taiyoyuden UMK107CH101JZ C5 100 pF 50 V,[...]

  • 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 SBAU141 – January 2009 Schematic, PCB Layout, and Bill of Materials 41 Submit Documentation Feedback[...]

  • Page 42

    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 th[...]

  • 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[...]