Manuel d'utilisation / d'entretien du produit DEM-PCM2912A EVM du fabricant Texas Instruments
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DEM-PCM2912A EVM User's Guide Literature Number: SBAU141 January 2009.
2 SBAU141 – January 2009 Submit Documentation Feedback.
Contents Preface ............................................................................................................................... 7 1 Description ..........................................................................................
www.ti.com List of Figures 1-1 PCM2912A Pin Assignments ............................................................................................. 11 1-2 DEM-PCM2912A EVM Functional Block Diagram ....................................................
www.ti.com List of Tables 1-1 PCM2912A Terminal Functions .......................................................................................... 11 2-1 DEM-PCM2912A EVM Connectors ...................................................................
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 1.
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 .
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.
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.
1.2 Pin Assignments and Terminal Functions PCM2912APJT (32-pinTQFP) 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 .
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 .
1.3 Functional Block Diagram S S XTI XTO 6.000MHz 96MHz PLL(x16) T racker (SpAct ) â USBprotocol controller ISO-out endpoint Control endpoint ISO-in endpoint FIFO FIFO XCVR Selector Selector Analog PLL Analog PLL USBSIE V REF 5Vto3.
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.
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.
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.
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.
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.
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.
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.
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.
3.2 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.
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.
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 .
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 .
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.
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.
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 .
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.
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.
4.1 Measurements for Dynamic Characteristics 4.2 Playback Performance PC Playingtestdataatf =44.1kHzbyapplicationsoftware (forexample,SoundRecorder ,MediaPlayer ,etc.
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.
4.3 Recording Performance PC Recordingatf =44.1kHzbyapplicationsoftware (forexample,SoundRecorder ,QuickTime,etc.) S USB Connector D2 D1 SW1 JP1 J1 JP2 J2 100mA .
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.
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 – .
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.
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 Rem.
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.
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.
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.
Un point important après l'achat de l'appareil (ou même avant l'achat) est de lire le manuel d'utilisation. Nous devons le faire pour quelques raisons simples:
Si vous n'avez pas encore acheté Texas Instruments DEM-PCM2912A EVM c'est un bon moment pour vous familiariser avec les données de base sur le produit. Consulter d'abord les pages initiales du manuel d'utilisation, que vous trouverez ci-dessus. Vous devriez y trouver les données techniques les plus importants du Texas Instruments DEM-PCM2912A EVM - de cette manière, vous pouvez vérifier si l'équipement répond à vos besoins. Explorant les pages suivantes du manuel d'utilisation Texas Instruments DEM-PCM2912A EVM, vous apprendrez toutes les caractéristiques du produit et des informations sur son fonctionnement. Les informations sur le Texas Instruments DEM-PCM2912A EVM va certainement vous aider à prendre une décision concernant l'achat.
Dans une situation où vous avez déjà le Texas Instruments DEM-PCM2912A EVM, mais vous avez pas encore lu le manuel d'utilisation, vous devez le faire pour les raisons décrites ci-dessus,. Vous saurez alors si vous avez correctement utilisé les fonctions disponibles, et si vous avez commis des erreurs qui peuvent réduire la durée de vie du Texas Instruments DEM-PCM2912A EVM.
Cependant, l'un des rôles les plus importants pour l'utilisateur joués par les manuels d'utilisateur est d'aider à résoudre les problèmes concernant le Texas Instruments DEM-PCM2912A EVM. Presque toujours, vous y trouverez Troubleshooting, soit les pannes et les défaillances les plus fréquentes de l'apparei Texas Instruments DEM-PCM2912A EVM ainsi que les instructions sur la façon de les résoudre. Même si vous ne parvenez pas à résoudre le problème, le manuel d‘utilisation va vous montrer le chemin d'une nouvelle procédure – le contact avec le centre de service à la clientèle ou le service le plus proche.
