DEM-PCM2912A EVM User's Guide Literature Number: SBAU141 January 2009
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Contents Preface ............................................................................................................................... 7 1 1.1 1.2 1.3 2 2.1 2.2 2.3 3 3.1 3.2 3.3 4 4.1 4.2 4.3 ................................................................................................................ 9 Introduction—PCM2912A ................................................................................................ 10 1.1.1 Key Features ...............................................
www.ti.com List of Figures 1-1 1-2 2-1 3-1 3-2 3-3 3-4 3-5 3-6 3-7 3-8 3-9 3-10 3-11 3-12 3-13 3-14 3-15 3-16 4-1 4-2 4-3 5-1 5-2 5-3 5-4 4 PCM2912A Pin Assignments ............................................................................................. DEM-PCM2912A EVM Functional Block Diagram ..................................................................... DEM-PCM2912A EVM Block Diagram ..................................................................................
www.ti.com List of Tables 1-1 2-1 4-1 4-2 4-3 4-4 5-1 PCM2912A Terminal Functions .......................................................................................... DEM-PCM2912A EVM Connectors ...................................................................................... Line Output Playback Performance ...................................................................................... 32-Ω Headphone Output Playback Performance ...........................................................
List of Tables 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) 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 http://www.
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://www.ti.
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 1.1 1.2 1.3 ..............
Introduction—PCM2912A 1.1 www.ti.com 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).
Pin Assignments and Terminal Functions www.ti.com 1.2 Pin Assignments and Terminal Functions Figure 1-1 shows the pin assignments for the PCM2912A. Table 1-1 lists the terminal functions.
Pin Assignments and Terminal Functions www.ti.com Table 1-1.
Functional Block Diagram www.ti.com 1.3 Functional Block Diagram Figure 1-2 illustrates the functional block diagram of the DEM-PCM2912A EVM. MIC Bias MBIAS VIN BGND VCCA/VCCP/VCCL/VCCR/VDD VREF 5 V to 3.
Description 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 2.2 2.3 .................................................................................................. Page Electrostatic Discharge Warning ................................................. 16 Block Diagram .......................
Electrostatic Discharge Warning 2.1 www.ti.com 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.
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 3.2 3.3 .................................................................................................. Page Basic Operating Set-Up—Windows Vista ..................................... 18 Basic Operating Set-Up—Windows XP .
Basic Operating Set-Up—Windows Vista 3.1 www.ti.com 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.
Basic Operating Set-Up—Windows Vista www.ti.com 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.
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.
Basic Operating Set-Up—Windows Vista www.ti.com 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. Open the Sound options from the Control Panel. (Start→Control Panel→Sound) 2. Open the speaker properties of the USB audio codec from the Sound options and select the Advanced tab, as Figure 3-5 illustrates. 3.
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 frequency from seven options: 8 kHz, 11.025 kHz,16 kHz, 22.5 kHz, 32 kHz, 44.1 kHz, and 48 kHz. Figure 3-6.
Basic Operating Set-Up—Windows XP www.ti.com 3.2 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. 3.2.1 Basic Setup Before Evaluation Follow these steps to set up the DEM-PCM2912A EVM for use with Windows XP. Step 1.
Basic Operating Set-Up—Windows XP www.ti.com 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. Open the Sound and Audio Devices Properties dialog box and select the Volume tab, as Figure 3-8 illustrates.
Basic Operating Set-Up—Windows XP www.ti.com 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); see Figure 3-7. 2. Set the volume and the mute levels for the microphone sidetone from –76 dB to 0 dB, as shown in Figure 3-9.
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 system volume setting for each component is maintained even if EVM is plugged in/out.
Basic Operating Set-Up—Mac OS www.ti.com 3.3 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. 3.3.1 Basic Setup Before Evaluation Follow these steps to set up the DEM-PCM2912A EVM for use with a Macintosh computer. Step 1.
Basic Operating Set-Up—Mac OS space Step 4. www.ti.com 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.
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. Alternatively, open the Output tab of the Sound options, as illustrated in Figure 3-13. Step 2. Set the headphone volume and the audio output levels from –76 dB to 0 dB, and set the desired mute.
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. Figure 3-15. QuickTime Audio Recording Controls After this process is complete, the system volume setting for each component is maintained even if EVM is plugged in/out. 3.3.
www.ti.com Basic Operating Set-Up—Mac OS Figure 3-16.
Set-Up Guide 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 4.2 4.3 .................................................................................................. Page Measurements for Dynamic Characteristics .................................
Measurements for Dynamic Characteristics 4.1 www.ti.com Measurements for Dynamic Characteristics Typical dynamic performance graphs for playback and recording devices generally represent three performance characteristics (in addition to other specifications): total harmonic distortion and noise (THD+N); signal-to-noise ratio (SNR); and dynamic range (DR). For playback devices, channel separation is also a performance characteristic.
Playback Performance www.ti.com Table 4-1. Line Output Playback Performance Power Supply 5.0 V Performance Filter Setting RL VOUTL VOUTR THD+N (0 dBFS at 1 kHz) 400 Hz to 20 kHz Pre-Anlr 10 kΩ 0.0086% 0.0085% SNR (BPZ input) 400 Hz to 20 kHz Pre-Anlr + A-weighting 10 kΩ 92.1 dB 92.1 dB DR (–60 dBFS input) 400 Hz to 20 kHz Pre-Anlr + A-weighting 10 kΩ 90.3 dB 90.5 dB Channel Separation 400 Hz to 20 kHz (BPZ input for target Pre-Anlr channel) 10 kΩ 89.3 dB 89.3 dB Table 4-2.
Recording Performance 4.3 www.ti.com Recording Performance The DEM-PCM2912A EVM playback performance presented in this section was obtained under the following conditions: • fS = 44.1 kHz • Input PGA (Microphone input volume): 0 dB • Jumper setting: set JP1 to 100 mA and JP2 to 0 dB • Application software for playback: Sound Recorder, Media Player and ITunes for Windows Vista/XP; QuickTime and ITunes for Mac OS X.
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 are not intended to be used for manufacturing DEM-PCM2912A EVM PCBs. Topic 5.1 5.2 5.3 ..........................................................................
Schematics 5.1 www.ti.com Schematics The schematic for the DEM-PCM2912A EVM is shown in Figure 5-1. Figure 5-1.
Printed Circuit Board Layout www.ti.com 5.2 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.
Component List 5.3 www.ti.com Component List Table 5-1 lists the bill of materials for the DEM-PCM2912A EVM. Table 5-1. Bill of Materials 40 Reference Designator Value Value2 C1 22 pF 50 V, 5% Taiyoyuden UMK107CH220JZ C2 22 pF 50 V, 5% Taiyoyuden UMK107CH220JZ C4 100 pF 50 V, 5% Taiyoyuden UMK107CH101JZ Manufacturer Mfr Part No C5 100 pF 50 V, 5% Taiyoyuden UMK107CH101JZ C13 0.022 µF 25 V, 10% Taiyoyuden TMK107BJ223KA C14 0.
Component List www.ti.com Table 5-1.
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.
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