Texas Instruments DEM-PCM2912A EVM User Manual

DEM-PCM2912A EVM

User's Guide

Literature Number: SBAU141

January 2009

2 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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