Texas Instruments DEM-PCM2912A EVM инструкция обслуживания

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

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

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

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 ...........................................[...]

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 .......................................[...]

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

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[...]

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[...]

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[...]

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[...]

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[...]

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 = +[...]

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[...]

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

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 ................................................................................[...]

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[...]

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 ...............................................................[...]

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[...]

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[...]

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 [...]

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[...]

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[...]

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. [...]

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 [...]

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[...]

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[...]

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[...]

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[...]

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 [...]

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[...]

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[...]

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

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 ..................................[...]

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 [...]

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.[...]

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[...]

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[...]

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[...]

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[...]

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,[...]

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[...]

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[...]

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