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DEM-PCM2912A EVM
User's Guide
Literature Number: SBAU141
January 2009
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2 SBAU141–January 2009 Submit Documentation Feedback
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Contents Preface ............................................................................................................................... 7 1 Description ................................................................................................................ 9 1.1 Introduction—PCM2912A ................................................................................................ 10 1.1.1 Key Features................................................................................
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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 .................................................................................. 16 3-1 Sound—Playback Tab (Windows Vista)......................................................................
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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...................................................................................... 35 4-2 32-Ω Headphone Output Playback Performance ......................................................
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6 List of Tables SBAU141–January 2009 Submit Documentation Feedback
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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) interface. For a more detailed description of the PCM2912A product line, refer to the product data sheet available from the Texas Instruments web site at ht
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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 the document revision that is current at the time of the writing of this User’s Guide. Newer revisions may be available from the TI web site at http:/
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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 connector is mounted on the DEM-PCM2912A EVM. Stereo audio output and mono audio input are available on two stereo mini-jacks. Topic ....................
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Introduction—PCM2912A www.ti.com 1.1 Introduction—PCM2912A 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 in a 32-pin TQFP package. ® The DEM-PCM2912A EVM also carries the Microsoft Windows Logo License certification from the Microsoft Windows Hardware Quality Labs (WHQL). The
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www.ti.com Pin Assignments and Terminal Functions 1.2 Pin Assignments and Terminal Functions Figure 1-1 shows the pin assignments for the PCM2912A. Table 1-1 lists the terminal functions. PCM2912APJT (Top View) 24 23 22 21 20 19 18 17 16 V PGND 25 IN 15 V V 26 CCA CCP 14 NC TEST1 27 13 AGND TEST0 28 PCM2912APJT (32-pin TQFP) 12 V SSPND 29 COM2 11 V MMUTE 30 COM1 10 FR REC 31 9 FL PLAY 32 1 2 3 4 5 6 7 8 Figure 1-1. PCM2912A Pin Assignments Table 1-1. PCM2912A Terminal Functions TQFP-36 Name Term
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Pin Assignments and Terminal Functions www.ti.com Table 1-1. PCM2912A Terminal Functions (continued) TQFP-36 Name Terminal I/O Description V 21 -– Analog power supply for headphone amplifier of R-channel CCR V R 22 O Headphone output for R-channel OUT MAMP 23 I Microphone preamplifier gain control (LOW: Preamplifier off; HIGH: Preamplifier on = +20 dB) POWER 24 I Power consumption declaration select pin (LOW: 100 mA; HIGH: 500 mA) PGND 25 – Analog ground for microphone bias, microphone amplifier
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www.ti.com Functional Block Diagram 1.3 Functional Block Diagram Figure 1-2 illustrates the functional block diagram of the DEM-PCM2912A EVM. BGND V /V /V /V /V AGND/HGND/PGND/DGND CCA CCP CCL CCR DD Power SSPND 5 V to 3.3 V Manager V Voltage REF Regulator V BUS MIC PGA +30 dB to MBIAS Bias -12 dB D+ in 1-dB steps MIC ISO-in XCVR D- FIFO Amp endpoint V IN ADC Selector USB SIE Control POWER Analog endpoint V COM2 PLL MAMP V COM1 MMUTE Analog ATT 0 dB to-76 dB PLL in 1-dB steps with Mute PLAY V L
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14 Description SBAU141–January 2009 Submit Documentation Feedback
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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 2.1 Electrostatic Discharge Warning................................................. 16 2.2 Block Diagram.........................
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Electrostatic Discharge Warning www.ti.com 2.1 Electrostatic Discharge Warning Many of the components on the DEM-PCM2912A 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. CAUTION Failure to observe ESD handling procedures may result in damage to EVM components. 2.2 Block Diagram Figure 2-1 illustrates the
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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 3.1 Basic Operating Set-Up—Windows Vista ..................................... 18 3.2 Basic Operating Set-Up—Windows
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Basic Operating Set-Up—Windows Vista www.ti.com 3.1 Basic Operating Set-Up—Windows Vista 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. 3.1.1 Basic Setup Before Evaluation Follow these steps to set up the DEM-PCM2912A EVM for use with Windows Vista. Step 1. Connect the USB connector of the DEM-PCM2912A EVM to an available USB connec
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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. Open the speaker properties of the USB audio codec from the Sound options and select the Levels tab, as Figure 3-3 illustrates. Step 3. Set the output volume, mute, and the balance for headphone
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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 recording mute level from –12 dB to +30 dB. Figure 3-4. Microphone Properties—Levels Tab (Windows Vista) After this process is complete, the system volume setting
