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4.3

Recording Performance

Recording at f = 44.1 kHz by application software
(for example, Sound Recorder, QuickTime, etc.)

USB
Connector

SW1

JP1

JP2

100 mA

0 dB

PCM2912

PCM2912-EVM

Mic

Headphone

Audio Precision

SYS-2722

Analog Generator

Unbalanced
Floating GND setting

Audio Precision

SYS-2722

Digital Analyzer

Volume gain = 0 dB

USB
Connector

DEM-PCM2704EVM

S/PDIF
Output

Recording Performance

The DEM-PCM2912 EVM playback performance presented in this section was obtained under the
following conditions:

•

= 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.

•

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. DEM-PCM2912 EVM Configuration for Recording Performance Measurement when Recording

Data

To measure recording performance with the recording data, use S/PDIF digital interface output data.
Connect the EVM to the AP2 digital analyzer (SYS-2722); for example, as the DEM-PCM2704 EVM
shown in

Figure 4-3

Figure 4-3. DEM-PCM2912 EVM Configuration for Recording Performance Measurement with Recorded

Data

Table 4-4. Line Input Recording Performance

Power Supply

Performance

Filter Setting

DOUT

5.0 V

THD+N (–1 dB at 1 kHz)

400 Hz to 20 kHz LP

0.008%

SNR (BPZ input)

400 Hz to 20 kHz LP

92.5 dB

+ A-weighting

DR (–60 dB input)

400 Hz to 20 kHz LP

90.5 dB

+ A-weighting

Evaluation and Measurements

SBAU132 – March 2008

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Содержание DEM-PCM2912 EVM

Страница 1: ...DEM PCM2912 EVM User s Guide March 2008 AIP Consumer Audio TI Japan SBAU132 ...

Страница 2: ...2 SBAU132 March 2008 Submit Documentation Feedback ...

Страница 3: ...s 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 Evaluation 27 3 3 2 Volume Settings 29 3 3 3 Sampling Frequency 30 4 Evaluation and Measurements 33 4 1 Measurements for Dynamic Characteristics 34 4 2 Playback Performance 34 4 3 Recording Performanc...

Страница 4: ... 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 Midi Setting Window Mac OS 29 3 15 QuickTime Audio Recording Controls 30 3 16 Audio Midi Setting Window Mac OS 31 4 1 DEM PCM2912 EVM Configuration for Playback Performance Measurement 34 4 2 DEM PCM29...

Страница 5: ...ors 16 4 1 Line Output Playback Performance 35 4 2 32 Ω Headphone Output Playback Performance 35 4 3 16 Ω Headphone Output Playback Performance 35 4 4 Line Input Recording Performance 36 5 1 Bill of Materials 40 SBAU132 March 2008 List of Tables 5 Submit Documentation Feedback ...

Страница 6: ...List of Tables 6 SBAU132 March 2008 Submit Documentation Feedback ...

Страница 7: ...ting 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 various PC operating systems for product evaluation Chapter 4 discusses how to configure the DEM PCM2912 EVM motherboard for performance evaluation using an audio analyzer Chapter 5 includes the E...

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 Information Center at 972 644 5580 or visit the TI web site at www ti com FCC Warning This equipment is intended for use in a laboratory test environment only It generates uses and can radiate radio frequenc...

Страница 9: ...ssary connectors and circuitry are provided for interfacing to audio test systems and commercial audio equipment A USB connector is mounted on the DEM PCM2912 EVM Stereo audio output and mono audio input are available on two stereo mini jacks Topic Page 1 1 Introduction PCM2912 10 1 2 Pin Assignments and Terminal Functions 11 1 3 Functional Block Diagram 13 SBAU132 March 2008 Description 9 Submit ...

Страница 10: ...me Analog Performance Dynamic range 90 dB DAC Dynamic range 90 dB ADC 25 mW headphone output at RL 16 Ω Power Supply Voltage Single power supply of 5 0 V VBUS Low Power Dissipation 425 mW at analog to digital converter ADC and digital to analog converter DAC operation 44 1 kHz 0 8 mW in Suspend mode Sampling Frequency 8 kHz 11 025 kHz 16 kHz 22 05 kHz 32 kHz 44 1 kHz 48 kHz for ADC and DAC Program...

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 9 External filter pin of left channel optional FR 10 External filter pin of right channel optional VCOM1 11 Common voltage for ADC DAC and analog front end VCCA 2 Decoupling capacitor should be connec...

Страница 12: ...on 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 pin Must be set to low SSPND 29 O Suspend flag LOW Suspend HIGH Operational state MMUTE 30 I Microphone mute control active high LOW Mute off HIGH Mute on REC 31 O Status output for record LOW Record ...

Страница 13: ... BGND V V V V V 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 steps with Mute ATT 0 dB to 76 dB in 1 dB steps with Mute HP AMP 15 mW at 32 W Functional Block Diagram Figure 1 2 illustrates the functional block diagram of the DEM PCM2912 EVM Figure 1 2...

Страница 14: ...Description 14 SBAU132 March 2008 Submit Documentation Feedback ...

Страница 15: ...the DEM PCM2912 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 16 2 3 Interface and Connections 16 SBAU132 March 2008 Getting Started 15 Submit Documentation Feedback ...

Страница 16: ... 2 1 illustrates the DEM PCM2912 EVM block diagram and the default external equipment connection configuration Figure 2 1 DEM PCM2912 EVM Block Diagram Table 2 1 lists the connector references for the DEM PCM2912 EVM Table 2 1 DEM PCM2912 EVM Connectors Connectors Part Description CN1 USB connector type A J1 Mono microphone input J2 Headphone output terminal D1 LED red record indicator flash while...

Страница 17: ...quipped 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 XP 23 3 3 Basic Operating Set Up Mac OS 27 SBAU132 March 2008 Set Up Guide 17 Submit Documentation Feedback ...

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 PCM2912 is unnecessary Step 2 Open the Control Panel from the Start menu Start Control Panel Open the Sound group from the Control Panel Step 3 Select the playback tab and confirm the USB audio codec app...

Страница 19: ...ct 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 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 volume and the...

Страница 20: ...o 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 for each component is maintained even if EVM is plugged in out Set Up Guide 20 SBAU132 March 2008 Submit Documentation F...

Страница 21: ... 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 Select the desired DAC 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 5 Speakers Properties Advanced Tab Windows V...

Страница 22: ...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 Microphone Properties Advanced Tab Windows Vista Set Up Guide 22 SBAU132 March 2008 Submit Documentation Feedback ...

Страница 23: ... The DEM PCM2912 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 driver for the DEM PCM2912 is unnecessary Step 2 Open the Control Panel from the Start menu Start Control Panel Open the Sound and Audio Devices group from the Control Panel Step 3 Select the Audio tab...

Страница 24: ...evices 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 the Volume tab see Figure 3 7 Step 3 Set the output volume and the mute levels for headphones from 76 dB to 0 dB The initial volume setting upon installation is approximately 15 dB Figure 3 8 Sound an...

Страница 25: ...t 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 Volume Setting Windows XP To set the record volume 1 Open the Sound options from the Control Panel Start Control Panel Sound 2 Open the Sound and Audio Devices Properties dialog box and select the Mic...

Страница 26: ...n 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 Set Up Guide 26 SBAU132 March 2008 Submit Documentation Feedback ...

Страница 27: ...to an available USB connector or hub port on the lab computer The DEM PCM2912 EVM can be connected directly to the PC without an additional USB cable After the EVM is connected to the PC the standard Mac OS driver installs automatically to the computer system A custom driver for the DEM PCM2912 is unnecessary Step 2 Open the System Environment Settings from the Start menu Open the Sound options fr...

Страница 28: ...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 PCM2912 EVM by Mac OS X Set Up Guide 28 SBAU132 March 2008 Submit Documentation Feedback ...

Страница 29: ...he 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 Settings options Application Utility Set Audio MIDI as illustrated in Figure 3 14 Alternatively open the Input tab of the Sound options as illustrated in Figure 3 12 2 Set the recording level from 12 dB...

Страница 30: ...ncy 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 Select the Audio Input tab in the Set Audio MIDI options group as Figure 3 16 shows 3 Select the desired DAC sampling frequency from seven options 8 kHz 11 025 kHz 16 kHz 22 5 kHz 32 kHz 44 1 kHz and 48 ...

Страница 31: ...www ti com Basic Operating Set Up Mac OS Figure 3 16 Audio Midi Setting Window Mac OS SBAU132 March 2008 Set Up Guide 31 Submit Documentation Feedback ...

Страница 32: ...Set Up Guide 32 SBAU132 March 2008 Submit Documentation Feedback ...

Страница 33: ...g 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 SBAU132 March 2008 Evaluation and Measurements 33 Submit Documentation Feedback ...

Страница 34: ...ns required in order to meet typical performance values defined in the product data sheet For the DEM PCM2912 EVM the evaluation environment specifications are Equipment used Audio Precision System Two Cascade Plus Power supply VBUS 5 0 V Bus power setting Temperature Room ambient The DEM PCM2912 EVM performance presented in this section was obtained under the following conditions fS 44 1 kHz Outp...

Страница 35: ...Performance Power Supply Performance Filter Setting RL VOUTL VOUTR 5 0 V THD N 0 dBFS at 400 Hz to 20 kHz 32 Ω 0 026 0 025 1 kHz Pre Anlr SNR BPZ input 400 Hz to 20 kHz 32 Ω 92 1 dB 92 1 dB Pre Anlr A weighting DR 60 dBFS 400 Hz to 20 kHz 32 Ω 89 4 dB 89 4 dB input Pre Anlr A weighting Table 4 3 16 Ω Headphone Output Playback Performance Power Supply Performance Filter Setting RL VOUTL VOUTR 5 0 V...

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 DEM PCM2912 EVM Configuration for Recording Performance Measurement when Recording Data To measure recording performance with the recording data use S PDIF digital interface output data Connect the E...

Страница 37: ...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 PCM2912 EVM PCBs Topic Page 5 1 Schematics 38 5 2 Printed Circuit Board Layout 39 5 3 Component List 40 SBAU132 March 2008 Schematic PCB Layout and Bill of Materials 37 Submit Documentation Feedback ...

Страница 38: ... Schematics Schematics The schematic for the DEM PCM2912 EVM is shown in Figure 5 1 Figure 5 1 DEM PCM2912 EVM Schematic Schematic PCB Layout and Bill of Materials 38 SBAU132 March 2008 Submit Documentation Feedback ...

Страница 39: ...e the printed circuit board PCB layout for the DEM PCM2912 EVM Figure 5 2 DEM PCM2912 EVM Board Layout Silkscreen Figure 5 3 DEM PCM2912 EVM Board Layout Component Side Figure 5 4 DEM PCM2912 EVM Board Layout Inner View SBAU132 March 2008 Schematic PCB Layout and Bill of Materials 39 Submit Documentation Feedback ...

Страница 40: ...06M8R C9 10 µF 6 3 V 20 Rohm TCP0J106M8R C15 100 µF 4 V 20 Matsushita ECE A0GKS101 C16 100 µF 4 V 20 Matsushita ECE A0GKS101 CN1 USB A ACON UAR10 4W5100 Host Interface D1 LED Rohm SLR342 VR Recording Indicator D2 LED Rohm SLR342 MG playback Indicator J1 Stereo mini Jack SMK LGY2502 0200 Stereo Headphone J2 Stereo mini Jack SMK LGY2502 0200 Mic Input and Bias R11 16 5 KOA RK73K1J 160J R12 16 5 KOA ...

Страница 41: ... 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 SBAU132 March 2008 Schematic PCB Layout and Bill of Materials 41 Submit Documentation Feedback ...

Страница 42: ...uct 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 or visit www ti com esh No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine process or combination in which such TI products or...

Страница 43: ...usiness practice 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 reasonably be expected to cause severe personal injury or death unless officers of the parties have executed an agreement specifically governing such use Buyers represent that they have all neces...

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