Texas Instruments DEM-PCM2912A EVM User Manual

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DEM-PCM2912A EVM

User's Guide

Literature Number: SBAU141

January 2009

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Contents

Preface ............................................................................................................................... 7

1 Description ................................................................................................................ 9

1.1 Introduction—PCM2912A ................................................................................................ 10

1.1.1 Key Features ....................................................................................................... 10

1.2 Pin Assignments and Terminal Functions .............................................................................. 11

1.3 Functional Block Diagram ................................................................................................. 13

2 Getting Started ......................................................................................................... 15

2.1 Electrostatic Discharge Warning ......................................................................................... 16

2.2 Block Diagram .............................................................................................................. 16

2.3 Interface and Connections ................................................................................................ 16

3 Set-Up Guide ........................................................................................................... 17

3.1 Basic Operating Set-Up—Windows Vista ............................................................................... 18

3.1.1 Basic Setup Before Evaluation .................................................................................. 18

3.1.2 Volume and Mute Settings ....................................................................................... 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 Performance ................................................................................................... 36

5 Schematic, PCB Layout, and Bill of Materials ............................................................... 37

5.1 Schematics .................................................................................................................. 38

5.2 Printed Circuit Board Layout .............................................................................................. 39

5.3 Component List ............................................................................................................. 40

Important Notices ............................................................................................................... 42

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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)................................................................................. 18

3-2 Sound—Recording Tab (Windows Vista) ............................................................................... 18

3-3 Speakers Properties—Levels Tab (Windows Vista) ................................................................... 19

3-4 Microphone Properties—Levels Tab (Windows Vista) ................................................................ 20

3-5 Speakers Properties—Advanced Tab (Windows Vista) ............................................................... 21

3-6 Microphone Properties—Advanced Tab (Windows Vista) ............................................................ 22

3-7 Sound and Audio Devices Properties—Audio Tab (Windows XP) .................................................. 23

3-8 Sound and Audio Devices Properties—Volume Tab (Windows XP) ................................................ 24

3-9 Speaker Window for Volume Setting (Windows XP) .................................................................. 25

3-10 Sound 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-PCM2912A EVM Configuration for Playback Performance Measurement .................................. 34

4-2 DEM-PCM2912A EVM Configuration for Recording Performance Measurement when Recording Data ...... 36

4-3 DEM-PCM2704EVM Configuration for Recording Performance Measurement with Recorded Data ........... 36

5-1 DEM-PCM2912A EVM Schematic ....................................................................................... 38

5-2 DEM-PCM2912A EVM Board Layout—Silkscreen .................................................................... 39

5-3 DEM-PCM2912A EVM Board Layout—Component Side ............................................................. 39

5-4 DEM-PCM2912A EVM Board Layout—Inner View .................................................................... 39

4 List of Figures SBAU141 – January 2009

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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 ...................................................................... 35

4-3 16- Ω Headphone Output Playback Performance ...................................................................... 35

4-4 Line Input Recording Performance....................................................................................... 36

5-1 Bill of Materials ............................................................................................................. 40

SBAU141 – January 2009 List of Tables 5

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List of Tables6 SBAU141 – January 2009

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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.ti.com . Support documents are listed in the section of this guide entitled Related Documentation from Texas Instruments .

How to Use This Manual

Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with the DEM-PCM2912A EVM.

Chapter 1 gives an overview of the PCM2912A USB interface codec. The EVM block diagram and primary

features are also discussed.

Chapter 2 provides general information regarding EVM handling and unpacking, absolute operating

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-PCM2912A EVM motherboard for performance evaluation

using an audio analyzer.

Chapter 5 includes the EVM electrical schematic, printed circuit board (PCB) layout, and the bill of

materials.

Preface

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Information About Cautions and Warnings

This document contains caution statements.

This is an example of a caution statement. A caution statement describes a situation that could potentially damage your software or equipment.

The information in a caution or a warning is provided for your protection. Please read each caution and warning carefully.

Macintosh, QuickTime are registered trademarks of Apple Incorporated. SYS-2722 is a registered trademark of Audio Precision, Inc. Windows, Windows Vista, Windows XP are registered trademarks of Microsoft Corporation. All other trademarks are the property of their respective owners.

CAUTION

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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.com/ or call the Texas Instruments Literature Response Center at (800) 477–8924 or the Product Information Center at (972) 644–5580. When ordering, identify the document(s) by both title and literature number.

If You Need 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 frequency energy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense is required to take whatever measures may be required to correct this interference.

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Data Sheet Literature Number

PCM2912A Product data sheet SLES230

Trademarks

All trademarks are the property of their respective owners.

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Chapter 1

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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 .................................................................................................. Page

1.1 Introduction—PCM2912A .......................................................... 10

1.2 Pin Assignments and Terminal Functions .................................... 11

1.3 Functional Block Diagram .......................................................... 13

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Introduction—PCM2912A

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

Microsoft Windows Hardware Quality Labs (WHQL). The DEM-PCM2912A has successfully passed the Microsoft WLP test (DTM Audio) for Windows Vista

1.1.1 Key Features

Major features of the PCM2912A include:

• Analog Front End:

• Analog Back End:

• Analog Performance:

• Power-Supply Voltage

• Low Power Dissipation:

• Sampling Frequency: 8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz, 44.1 kHz, 48 kHz for ADC and

• Programmable Function:

• Package: 32-pin TQFP

• Operating Temperature Range: –25 ° C to +85 ° C

Logo License certification from the

x86/x64 platforms.

– Microphone amplifier (+20 dB gain) – Mono input

– Stereo/Mono headphone amplifier or line output with volume

– Dynamic range: 90 dB (DAC) – Dynamic range: 90 dB (ADC) – 25-mW headphone output at R

– Single power supply of 5.0 V (V

= 16 Ω

BUS

)

– 425 mW at analog-to-digital converter (ADC) and digital-to-analog converter (DAC) operation, 44.1

kHz

– 0.8 mW in Suspend mode DAC

– –76-dB to 0-dB gain for analog outputs – –12-dB to +30-dB gain for analog inputs – –76-dB to 0-dB gain for sidetone – 0-dB/20-dB gain for microphone amplifier – High-pass filter: 0.078 × fScutoff frequency

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Description 10 SBAU141 – January 2009

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PCM2912APJT

(32-pinTQFP)

1242

3224

6197188

PGND

CCP

CCA

TEST1

TEST0

AGND

SSPND

COM2

MMUTE

COM1

REC

PLAY

BGND

D+

DGND

XTO

XTI

POWER

MAMP

V R

HGND

CCL

V L

MBIAS

PCM2912APJT

(TopView)

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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

Figure 1-1. PCM2912A Pin Assignments

Table 1-1. PCM2912A Terminal Functions

Name Terminal I/O Description

BGND 1 – Reference for internal regulator V

BUS

D– 3 I/O USB differential input/output minus D+ 4 I/O USB differential input/output plus V

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) V

COM1

COM2

AGND 13 – Analog ground NC 14 – Not connected V

CCA

MBIAS 17 O Microphone bias output (0.75 V V

OUT

CCL

HGND 20 – Analog ground for headphone amplifier

L 18 O Headphone output for L-channel

TQFP-36

2 – Connect to USB power (V

5 – Digital power supply

11 – Common voltage for ADC, DAC and analog front-end (V

be connected to AGND.

12 – Common voltage for headphone (V

AGND.

15 – Analog power supply 16 I ADC microphone input

19 – Analog power supply for headphone amplifier of L-channel

)

BUS

/2). Decoupling capacitor should

CCA

/2). Decoupling capacitor should be connected to

CCA

)

CCA

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Pin Assignments and Terminal Functions

Table 1-1. PCM2912A Terminal Functions (continued)

Name Terminal I/O Description

CCR

R 22 O Headphone output for R-channel

OUT

MAMP 23 I Microphone preamplifier gain control (LOW: Preamplifier off; HIGH: Preamplifier on = +20

POWER 24 I Power consumption declaration select pin (LOW: 100 mA; HIGH: 500 mA) PGND 25 – Analog ground for microphone bias, microphone amplifier, and PGA V

CCP

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; FLASH: Mute on record; HIGH: Stop) PLAY 32 O Status output for playback (LOW: Playback; FLASH: Mute on playback; HIGH: Stop)

TQFP-36

21 -– Analog power supply for headphone amplifier of R-channel

dB)

26 – Analog power supply for PLL

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12 Description SBAU141 – January 2009

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XTI

XTO

6.000MHz

96MHz

PLL(x16)

Tracker

(SpAct )

USBprotocol

controller

ISO-out

endpoint

Control

endpoint

ISO-in

endpoint

FIFO

XCVR

Selector

Analog

PLL

Analog

PLL

USBSIE

REF

5Vto3.3V

Voltage

Regulator

Power

Manager

ADC

DAC

MIC

Bias

MIC

Amp

BGND V /V /V /V /V

CCA CCP CCL CCR DD

AGND/HGND/PGND/DGND

SSPND

BUS

D+

D-

POWER

MAMP

MMUTE

PLAY

REC

TEST0

TEST1

MBIAS

COM2

COM1

V L

OUT

V R

OUT

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

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1.3 Functional Block Diagram

Figure 1-2 illustrates the functional block diagram of the DEM-PCM2912A EVM.

Functional Block Diagram

Figure 1-2. DEM-PCM2912A EVM Functional Block Diagram

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Description 14 SBAU141 – January 2009

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Chapter 2

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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 .......................................................................... 16

2.3 Interface and Connections ......................................................... 16

SBAU141 – January 2009 Getting Started 15

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USB

Connector

D2 D1

SW1

JP1

JP2

PCM2912A

PCM2912A-EVM

Mic

Headphone

CN1

D+,DPLAY REC

V L/R

OUT

POWER

MMUTE MAMP

Electrostatic Discharge Warning

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.

Failure to observe ESD handling procedures may result in damage to EVM components.

2.2 Block Diagram

Figure 2-1 illustrates the DEM-PCM2912A EVM block diagram and the default external equipment

connection configuration.

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CAUTION

2.3 Interface and Connections

Figure 2-1. DEM-PCM2912A EVM Block Diagram

Table 2-1 lists the connector references for the DEM-PCM2912A EVM.

Table 2-1. DEM-PCM2912A 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 muting) D2 LED (green); playback indicator (flash while muting) SW1 Microphone mute switch JP1 Power select (L: 100 mA, H: 500 mA) JP2 Microphone amplifier gain control

(Gain = 0 dB/+20 dB)

(1)

The status of SW1 (microphone mute switch) is not reflected in the Mic Mute status of the Wave In display on a Windows-based PC; the operating system does not support an HID function.

Getting Started16 SBAU141 – January 2009

(1)

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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 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

, Windows XP

Chapter 3

, and

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Basic Operating Set-Up—Windows Vista

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 connector (or

hub) port on the lab PC. 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 Windows Vista driver installs automatically to the PC. A custom driver for the DEM-PCM2912A 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 appearance as the default

playback device, as shown in Figure 3-1 .

Step 4. Select the recording tab and confirm the USB audio codec appearance as the default

recording device, as shown in Figure 3-2 .

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Figure 3-1. Sound—Playback Tab Figure 3-2. Sound—Recording Tab

(Windows Vista) (Windows Vista)

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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

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

Step 3. Set the volume and the mute levels for the microphone sidetone from –76 dB to 0 dB.

Basic Operating Set-Up—Windows Vista

Levels tab, as Figure 3-3 illustrates.

Figure 3-3. Speakers Properties—Levels Tab (Windows Vista)

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Basic Operating Set-Up—Windows Vista

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.

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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.

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3.1.3 Sampling Frequency

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.

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. 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 Vista)

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Basic Operating Set-Up—Windows Vista

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.

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Figure 3-6. Microphone Properties—Advanced Tab (Windows Vista)

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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. Connect the USB connector of the DEM-PCM2912A EVM to an available USB connector (or

hub) port on the lab PC. 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 Windows XP driver installs automatically to the PC. A custom driver for the DEM-PCM2912A 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 and confirm the USB audio codec appearance as the default playback

and recording device, as shown in Figure 3-7 .

Basic Operating Set-Up—Windows XP

Figure 3-7. Sound and Audio Devices Properties—Audio Tab (Windows XP)

This process confirms the proper recognition of the DEM-PCM2912A EVM by Windows XP.

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Basic Operating Set-Up—Windows XP

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. 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.

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Figure 3-8. Sound and Audio Devices Properties—Volume Tab (Windows XP)

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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 . 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 . 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 Microphone tab, as

Figure 3-10 illustrates.

Figure 3-10. Sound and Audio Devices Properties—Audio Tab (Windows XP)

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Basic Operating Set-Up—Windows XP

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.

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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. Connect the USB connector of the DEM-PCM2912A EVM to 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 Mac OS driver installs automatically to the computer system. A custom driver for the DEM-PCM2912A is unnecessary.

Step 2. Open the System Environment Settings from the Start menu. Open the Sound options from

the System Environment settings.

Step 3. Select the Input tab and confirm the USB audio codec appearance as the default recording

device, as shown in Figure 3-12 .

Basic Operating Set-Up—Mac OS

Figure 3-12. Sound—Input Tab (Mac OS)

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Basic Operating Set-Up—Mac OS

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 .

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Figure 3-13. Sound—Output Tab (Mac OS)

This process confirms the proper recognition of the DEM-PCM2912A EVM by Mac OS X.

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3.3.2 Volume Settings

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 . 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.

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 to +30 dB, and set the desired mute.

Figure 3-14. Audio Midi Setting Window (Mac OS)

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Basic Operating Set-Up—Mac OS

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 microphone volume for sidetone from –76dB to 0dB.

After this process is complete, the system volume setting for each component is maintained even if EVM is plugged in/out.

3.3.3 Sampling Frequency

Under the Mac OS X 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 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 kHz.

To set the ADC sampling frequency:

1. Open the Audio MIDI Settings options ( Application → Utility → Set Audio MIDI), as illustrated in

Figure 3-16 .

2. Select the Audio Output tab in the Set Audio MIDI options group, as shown in Figure 3-16 .

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 3-15. QuickTime Audio Recording Controls

(as shown in Figure 3-15 ) sets the

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30 Set-Up Guide SBAU141 – January 2009

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Basic Operating Set-Up—Mac OS

Figure 3-16. Audio Midi Setting Window (Mac OS)

SBAU141 – January 2009 Set-Up Guide 31

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Set-Up Guide32 SBAU141 – January 2009

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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 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

audio analyzer. The process of measuring dynamic characteristics is then

SBAU141 – January 2009 Evaluation and Measurements 33

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Playingtestdataatf =44.1kHzbyapplicationsoftware (forexample,SoundRecorder,MediaPlayer,etc.)

USB Connector

D2 D1

SW1

JP1

JP2

100mA

0dB

PCM2912A

PCM2912A-EVM

Mic

Headphone

AudioPrecision

SYS-2722

AnalogAnalyzer

Leftch

Rightch

Measurements for Dynamic Characteristics

4.1 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. These graphs also specify the test environment and measurement conditions 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 Two Cascade Plus

• Power supply: V

• Temperature: Room/ambient

4.2 Playback Performance

The DEM-PCM2912A EVM performance presented in this section was obtained under the following conditions:

• fS= 44.1 kHz

• Output PGA (Speaker output volume): 0 dB

• Sidetone from microphone PGA: –76 dB (mute)

• R

= 10 k Ω / 32 Ω / 16 Ω are inserted into headphone jack J2 for headphone output

• 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.

• Equipment: AP2 Analog Analyzer (SYS-2722)

Configure the equipment as shown in Figure 4-1 .

= 5.0 V (Bus power setting)

BUS

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Figure 4-1. DEM-PCM2912A EVM Configuration for Playback Performance Measurement

34 Evaluation and Measurements SBAU141 – January 2009

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Playback Performance

Table 4-1. Line Output Playback Performance

Power Supply Performance Filter Setting 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 92.1 dB 92.1 dB

Pre-Anlr + A-weighting

DR (–60 dBFS 400 Hz to 20 kHz 10 k Ω 90.3 dB 90.5 dB input) Pre-Anlr

+ A-weighting

Channel Separation 400 Hz to 20 kHz 10 k Ω 89.3 dB 89.3 dB (BPZ input for target Pre-Anlr channel)

L V

OUT

Table 4-2. 32- Ω Headphone Output Playback Performance

Power Supply Performance Filter Setting R

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

L V

OUT

Table 4-3. 16- Ω Headphone Output Playback Performance

Power Supply Performance Filter Setting R

5.0 V THD+N (0 dBFS at 400 Hz to 20 kHz 16 Ω 0.044% 0.042% 1 kHz) Pre-Anlr

SNR (BPZ input) 400 Hz to 20 kHz 16 Ω 92.1 dB 92.1 dB

Pre-Anlr + A-weighting

DR (–60 dBFS 400 Hz to 20 kHz 16 Ω 89.4 dB 89.3 dB input) Pre-Anlr

+ A-weighting

OUT

L V

OUT

SBAU141 – January 2009 Evaluation and Measurements 35

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

USB Connector

D2 D1

SW1

JP1

JP2

100mA

0dB

PCM2912A

PCM2912A-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

4.3 Recording Performance

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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.

• 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-PCM2912A 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-PCM2704EVM Configuration for Recording Performance Measurement with Recorded

Data

Table 4-4. Line Input Recording Performance

Evaluation and Measurements36 SBAU141 – January 2009

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

DR (–60 dB input) 400 Hz to 20 kHz LP 90.5 dB

+ A-weighting

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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 .................................................................................................. Page

5.1 Schematics .............................................................................. 38

5.2 Printed Circuit Board Layout ...................................................... 39

5.3 Component List ........................................................................ 40

SBAU141 – January 2009 Schematic, PCB Layout, and Bill of Materials 37

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Schematics

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5.1 Schematics

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 Materials38 SBAU141 – January 2009

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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.

Printed Circuit Board Layout

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 Board Layout—Inner View

SBAU141 – January 2009 Schematic, PCB Layout, and Bill of Materials 39

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Component List

5.3 Component List

Table 5-1 lists the bill of materials for the DEM-PCM2912A EVM.

Reference

Designator Value Value2 Manufacturer Mfr Part No Remarks

C1 22 pF 50 V, 5% Taiyoyuden UMK107CH220JZ C2 22 pF 50 V, 5% Taiyoyuden UMK107CH220JZ C4 100 pF 50 V, 5% Taiyoyuden UMK107CH101JZ

C5 100 pF 50 V, 5% Taiyoyuden UMK107CH101JZ C13 0.022 µ F 25 V, 10% Taiyoyuden TMK107BJ223KA C14 0.022 µ F 25 V, 10% Taiyoyuden TMK107BJ223KA

C7 0.1 µ F 25 V, 10% Taiyoyuden TMK105BJ104KV C11 1 µ F 16 V, 10% Matsushita ECJ-1VB1C105K C12 1 µ F 16 V, 10% Matsushita ECJ-1VB1C105K C17 1 µ F 16 V, 10% Matsushita ECJ-1VB1C105K C18 1 µ F 16 V, 10% Matsushita ECJ-1VB1C105K

C3 1 µ F 16 V, 10% Matsushita ECJ-1VB1C105K

C8 1 µ F 16 V, 10% Matsushita ECJ-1VB1C105K C10 3.3 µ F 10 V, 10% Murata SS GRM40B335K10PT

C6 10 µ F 6.3 V, 20% Rohm TCP0J106M8R

C9 10 µ F 6.3 V, 20% Rohm TCP0J106M8R C15 100 µ F 4 V, 20% Matsushita ECE-A0GKS101 C16 100 µ F 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 RK73K1J-160J

R1 33 5% KOA RK73K1J-330J Should be adjusted

R2 33 5% KOA RK73K1J-330J R17 820 5% KOA RK73K1J-821J R18 820 5% KOA RK73K1J-821J R19 1k 5% KOA RK73K1J-102J

R3 1.5k 5% KOA RK73K1J-152J R13 3.3k 5% KOA RK73K1J-332J R14 3.3k 5% KOA RK73K1J-332J R15 3.3k 5% KOA RK73K1J-332J R16 3.3k 5% KOA RK73K1J-332J

R4 1M 5% KOA RK73K1J-105J

SW1 Tact SW ALPS SKQTLBE010 Mic Mute

U1 PCM2912APJT TI

Y1 Crystal 6 MHz, ± 30 ppm Epson CA301 6.000M-C JP2 Jumper SW Hiroshe denshi A2-3PA2.54DSA(71) JP3 Jumper SW Hiroshe denshi A2-3PA2.54DSA(71)

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Table 5-1. Bill of Materials

to meet USB spec.

40 Schematic, PCB Layout, and Bill of Materials SBAU141 – January 2009

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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 pin Mac8 HK-6-S

TP6–TP11

SBAU141 – January 2009 Schematic, PCB Layout, and Bill of Materials 41

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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

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Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.

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Texas Instruments DEM-PCM2912A EVM User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Description

1.1 Introduction—PCM2912A

1.1.1 Key Features

1.2 Pin Assignments and Terminal Functions

1.3 Functional Block Diagram

Getting Started

2.1 Electrostatic Discharge Warning

2.2 Block Diagram

2.3 Interface and Connections

Set-Up Guide

3.1 Basic Operating Set-Up—Windows Vista

3.1.1 Basic Setup Before Evaluation

3.1.2 Volume and Mute Settings

3.1.3 Sampling Frequency

3.2 Basic Operating Set-Up—Windows XP

3.2.1 Basic Setup Before Evaluation

3.2.2 Volume Settings

3.3 Basic Operating Set-Up—Mac OS

3.3.1 Basic Setup Before Evaluation

3.3.2 Volume Settings

3.3.3 Sampling Frequency

Evaluation and Measurements

4.1 Measurements for Dynamic Characteristics

4.2 Playback Performance

4.3 Recording Performance

Schematic, PCB Layout, and Bill of Materials

5.1 Schematics

5.2 Printed Circuit Board Layout

5.3 Component List