Texas Instruments DEM-PCM2912A EVM Скачать руководство пользователя страница 33 | Manualshive

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Texas Instruments DEM-PCM2912A EVM Скачать руководство пользователя страница 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

4.1

Measurements for Dynamic Characteristics

.................................

34

4.2

Playback Performance

...............................................................

34

4.3

Recording Performance

.............................................................

36

SBAU141 – January 2009

Evaluation and Measurements

33

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Содержание DEM-PCM2912A EVM

Страница 1: ...DEM PCM2912A EVM User s Guide Literature Number SBAU141 January 2009...

Страница 2: ...2 SBAU141 January 2009 Submit Documentation Feedback...

Страница 3: ...19 3 1 3 Sampling Frequency 21 3 2 Basic Operating Set Up Windows XP 23 3 2 1 Basic Setup Before Evaluation 23 3 2 2 Volume Settings 24 3 3 Basic Operating Set Up Mac OS 27 3 3 1 Basic Setup Before Ev...

Страница 4: ...nd and Audio Devices Properties Audio Tab Windows XP 25 3 11 Microphone Volume Windows for Record Volume Setting Windows XP 26 3 12 Sound Input Tab Mac OS 27 3 13 Sound Output Tab Mac OS 28 3 14 Audio...

Страница 5: ...Connectors 16 4 1 Line Output Playback Performance 35 4 2 32 Headphone Output Playback Performance 35 4 3 16 Headphone Output Playback Performance 35 4 4 Line Input Recording Performance 36 5 1 Bill o...

Страница 6: ...List of Tables 6 SBAU141 January 2009 Submit Documentation Feedback...

Страница 7: ...g conditions and the default switch and jumper configuration Chapter 3 is the hardware and software setup guide for the EVM providing all of the necessary information needed to configure the EVM under...

Страница 8: ...Assistance If you have questions regarding either the use of this evaluation module or the information contained in the accompanying documentation please contact the Texas Instruments Product Informat...

Страница 9: ...sary 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 in...

Страница 10: ...Front End Microphone amplifier 20 dB gain Mono input Analog Back End Stereo Mono headphone amplifier or line output with volume Analog Performance Dynamic range 90 dB DAC Dynamic range 90 dB ADC 25 mW...

Страница 11: ...O USB differential input output minus D 4 I O USB differential input output plus VDD 5 Digital power supply DGND 6 Digital ground XTO 7 O Crystal oscillator output XTI 8 I Crystal oscillator input FL...

Страница 12: ...select pin LOW 100 mA HIGH 500 mA PGND 25 Analog ground for microphone bias microphone amplifier and PGA VCCP 26 Analog power supply for PLL TEST1 27 I Test pin Must be set to high TEST0 28 I Test pi...

Страница 13: ...CCA CCP CCL CCR DD AGND HGND PGND DGND SSPND VBUS D D POWER MAMP MMUTE PLAY REC TEST0 TEST1 MBIAS VIN VCOM2 VCOM1 V L OUT V R OUT FL FR PGA 30 dB to 12 dB in 1 dB steps ATT 0 dB to 76 dB in 1 dB step...

Страница 14: ...Description 14 SBAU141 January 2009 Submit Documentation Feedback...

Страница 15: ...e 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 Bloc...

Страница 16: ...1 illustrates the DEM PCM2912A EVM block diagram and the default external equipment connection configuration Figure 2 1 DEM PCM2912A EVM Block Diagram Table 2 1 lists the connector references for the...

Страница 17: ...uipped 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 Opera...

Страница 18: ...be connected directly to the PC without an additional USB cable After the EVM is connected to the PC the standard Windows Vista driver installs automatically to the PC A custom driver for the DEM PCM2...

Страница 19: ...the Levels tab as Figure 3 3 illustrates Step 3 Set the output volume mute and the balance for headphones from 76 dB to 0 dB To set the microphone sidetone Step 1 Open the Sound options from the Cont...

Страница 20: ...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 Leve...

Страница 21: ...ampling 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 F...

Страница 22: ...crophone 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...

Страница 23: ...he DEM PCM2912A EVM can be connected directly to the PC without an additional USB cable After the EVM is connected to the PC the standard Windows XP driver installs automatically to the PC A custom dr...

Страница 24: ...ices Properties dialog box and select the Volume tab as Figure 3 8 illustrates Alternatively open the Speakers window from the Volume selection box on the Audio tab or the Advanced selection box on th...

Страница 25: ...the volume and the mute levels for the microphone sidetone from 76 dB to 0 dB as shown in Figure 3 9 The initial volume setting upon installation is approximately 8 dB Figure 3 9 Speaker Window for Vo...

Страница 26: ...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 volu...

Страница 27: ...an available USB connector or hub port on the lab computer The DEM PCM2912A EVM can be connected directly to the PC without an additional USB cable After the EVM is connected to the PC the standard M...

Страница 28: ...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...

Страница 29: ...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 To set the record volume 1 Open the Audio MIDI Sett...

Страница 30: ...y cannot be changed on nearly all application software To set the DAC sampling frequency 1 Open the Audio MIDI Settings options Application Utility Set Audio MIDI as illustrated in Figure 3 16 2 Selec...

Страница 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...

Страница 32: ...Set Up Guide 32 SBAU141 January 2009 Submit Documentation Feedback...

Страница 33: ...the Audio Precision SYS 2722 audio analyzer The process of measuring dynamic characteristics is then presented along with example characteristic data Topic Page 4 1 Measurements for Dynamic Character...

Страница 34: ...ns required in order to meet typical performance values defined in the product data sheet For the DEM PCM2912A EVM the evaluation environment specifications are Equipment used Audio Precision System T...

Страница 35: ...k Performance Power Supply Performance Filter Setting RL VOUTL VOUTR 5 0 V THD N 0 dBFS at 400 Hz to 20 kHz 32 0 026 0 025 1 kHz Pre Anlr SNR BPZ input 400 Hz to 20 kHz 32 92 1 dB 92 1 dB Pre Anlr A w...

Страница 36: ...QuickTime and ITunes for Mac OS X Use analog input data provided by the AP2 analog generator SYS 2722 with unbalanced floating ground setting Configure the equipment as shown in Figure 4 2 Figure 4 2...

Страница 37: ...ncluded 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 PCM2912...

Страница 38: ...hematics 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 Docume...

Страница 39: ...e 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 Boar...

Страница 40: ...C9 10 F 6 3 V 20 Rohm TCP0J106M8R C15 100 F 4 V 20 Matsushita ECE A0GKS101 C16 100 F 4 V 20 Matsushita ECE A0GKS101 CN1 USB A ACON UAR10 4W5100 Host Interface D1 LED Rohm SLR342 VR Recording Indicator...

Страница 41: ...ontinued 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...

Страница 42: ...ct This notice contains important safety information about temperatures and voltages For additional information on TI s environmental and or safety programs please contact the TI application engineer...

Страница 43: ...ce TI is not responsible or liable for any such statements TI products are not authorized for use in safety critical applications such as life support where a failure of the TI product would reasonabl...

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