Texas Instruments DEM-PCM2912A EVM User manual

DEM-PCM2912A EVM
User's Guide
Literature Number: SBAU141January 2009

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Contents
Preface ............................................................................................................................... 7
1 Description ................................................................................................................ 91.1 Introduction—PCM2912A ................................................................................................ 101.1.1 Key Features ....................................................................................................... 101.2 Pin Assignments and Terminal Functions .............................................................................. 111.3 Functional Block Diagram ................................................................................................. 13
2 Getting Started ......................................................................................................... 152.1 Electrostatic Discharge Warning ......................................................................................... 162.2 Block Diagram .............................................................................................................. 162.3 Interface and Connections ................................................................................................ 16
3 Set-Up Guide ........................................................................................................... 173.1 Basic Operating Set-Up—Windows Vista ............................................................................... 183.1.1 Basic Setup Before Evaluation .................................................................................. 183.1.2 Volume and Mute Settings ....................................................................................... 193.1.3 Sampling Frequency .............................................................................................. 213.2 Basic Operating Set-Up—Windows XP ................................................................................. 233.2.1 Basic Setup Before Evaluation .................................................................................. 233.2.2 Volume Settings ................................................................................................... 243.3 Basic Operating Set-Up—Mac OS ....................................................................................... 273.3.1 Basic Setup Before Evaluation .................................................................................. 273.3.2 Volume Settings ................................................................................................... 293.3.3 Sampling Frequency .............................................................................................. 30
4 Evaluation and Measurements ................................................................................... 334.1 Measurements for Dynamic Characteristics ............................................................................ 344.2 Playback Performance ..................................................................................................... 344.3 Recording Performance ................................................................................................... 36
5 Schematic, PCB Layout, and Bill of Materials ............................................................... 375.1 Schematics .................................................................................................................. 385.2 Printed Circuit Board Layout .............................................................................................. 395.3 Component List ............................................................................................................. 40
Important Notices ............................................................................................................... 42
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List of Figures
1-1 PCM2912A Pin Assignments ............................................................................................. 111-2 DEM-PCM2912A EVM Functional Block Diagram ..................................................................... 132-1 DEM-PCM2912A EVM Block Diagram .................................................................................. 163-1 Sound—Playback Tab (Windows Vista)................................................................................. 183-2 Sound—Recording Tab (Windows Vista) ............................................................................... 183-3 Speakers Properties—Levels Tab (Windows Vista) ................................................................... 193-4 Microphone Properties—Levels Tab (Windows Vista) ................................................................ 203-5 Speakers Properties—Advanced Tab (Windows Vista) ............................................................... 213-6 Microphone Properties—Advanced Tab (Windows Vista) ............................................................ 223-7 Sound and Audio Devices Properties—Audio Tab (Windows XP) .................................................. 233-8 Sound and Audio Devices Properties—Volume Tab (Windows XP) ................................................ 243-9 Speaker Window for Volume Setting (Windows XP) .................................................................. 253-10 Sound and Audio Devices Properties—Audio Tab (Windows XP) .................................................. 253-11 Microphone Volume Windows for Record Volume Setting (Windows XP) ......................................... 263-12 Sound—Input Tab (Mac OS) ............................................................................................. 273-13 Sound—Output Tab (Mac OS) ........................................................................................... 283-14 Audio Midi Setting Window (Mac OS) ................................................................................... 293-15 QuickTime Audio Recording Controls ................................................................................... 303-16 Audio Midi Setting Window (Mac OS) ................................................................................... 314-1 DEM-PCM2912A EVM Configuration for Playback Performance Measurement .................................. 344-2 DEM-PCM2912A EVM Configuration for Recording Performance Measurement when Recording Data ...... 364-3 DEM-PCM2704EVM Configuration for Recording Performance Measurement with Recorded Data ........... 365-1 DEM-PCM2912A EVM Schematic ....................................................................................... 385-2 DEM-PCM2912A EVM Board Layout—Silkscreen .................................................................... 395-3 DEM-PCM2912A EVM Board Layout—Component Side ............................................................. 395-4 DEM-PCM2912A EVM Board Layout—Inner View .................................................................... 39
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List of Tables
1-1 PCM2912A Terminal Functions .......................................................................................... 112-1 DEM-PCM2912A EVM Connectors ...................................................................................... 164-1 Line Output Playback Performance ...................................................................................... 354-2 32- ΩHeadphone Output Playback Performance ...................................................................... 354-3 16- ΩHeadphone Output Playback Performance ...................................................................... 354-4 Line Input Recording Performance....................................................................................... 365-1 Bill of Materials ............................................................................................................. 40
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List of Tables6 SBAU141 – January 2009Submit Documentation Feedback

PrefaceSBAU141 – January 2009
Read This First
About This Manual
This document provides the information needed to set up and operate the DEM-PCM2912A EVMevaluation 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 availablefrom the Texas Instruments web site at http://www.ti.com . Support documents are listed in the section ofthis guide entitled Related Documentation from Texas Instruments .
How to Use This ManualThroughout this document, the abbreviation EVM and the term evaluation module are synonymous withthe DEM-PCM2912A EVM.
Chapter 1 gives an overview of the PCM2912A USB interface codec. The EVM block diagram and primaryfeatures are also discussed.
Chapter 2 provides general information regarding EVM handling and unpacking, absolute operatingconditions, and the default switch and jumper configuration.
Chapter 3 is the hardware and software setup guide for the EVM, providing all of the necessaryinformation 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 evaluationusing an audio analyzer.
Chapter 5 includes the EVM electrical schematic, printed circuit board (PCB) layout, and the bill ofmaterials.
Information About Cautions and WarningsThis document contains caution statements.
CAUTION
This is an example of a caution statement. A caution statement describes asituation 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 andwarning 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.
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Related Documentation From Texas Instruments www.ti.com
Related Documentation From Texas InstrumentsThe following documents provide information regarding Texas Instruments integrated circuits used in theassembly of the DEM-PCM2912A EVM. These documents are available from the TI web site . The lastcharacter of the literature number corresponds to the document revision that is current at the time of thewriting of this User’s Guide. Newer revisions may be available from the TI web site at http://www.ti.com/ orcall the Texas Instruments Literature Response Center at (800) 477–8924 or the Product InformationCenter at (972) 644–5580. When ordering, identify the document(s) by both title and literature number.Data Sheet Literature Number
PCM2912A Product data sheet SLES230
If You Need Assistance
If you have questions regarding either the use of this evaluation module or the information contained in theaccompanying 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 canradiate radio frequency energy and has not been tested for compliance with the limits of computingdevices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonableprotection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense is required totake whatever measures may be required to correct this interference.
Trademarks
All trademarks are the property of their respective owners.
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Chapter 1SBAU141 – January 2009
Description
The DEM-PCM2912A EVM is a complete evaluation platform for the 16-bit, mono microphone input andstereo headphone output PCM2912A bus-powered audio codec with a USB interface. All necessaryconnectors and circuitry are provided for interfacing to audio test systems and commercial audioequipment.
A USB connector is mounted on the DEM-PCM2912A EVM. Stereo audio output and mono audio inputare available on two stereo mini-jacks.
Topic .................................................................................................. Page
1.1 Introduction—PCM2912A .......................................................... 101.2 Pin Assignments and Terminal Functions .................................... 111.3 Functional Block Diagram .......................................................... 13
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1.1 Introduction—PCM2912A
1.1.1 Key Features
Introduction—PCM2912A www.ti.com
The PCM2912A is an audio codec with a USB interface for a USB headset, USB headphones, and a USBaudio interface box that integrates mono input, stereo headphone output, an analog loopback line, aprogrammable 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 theMicrosoft Windows Hardware Quality Labs (WHQL). The DEM-PCM2912A has successfully passed theMicrosoft WLP test (DTM Audio) for Windows Vista
®
x86/x64 platforms.
Major features of the PCM2912A include:•Analog 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 headphone output at R
L
= 16 Ω•Power-Supply Voltage– Single power supply of 5.0 V (V
BUS
)•Low Power Dissipation:– 425 mW at analog-to-digital converter (ADC) and digital-to-analog converter (DAC) operation, 44.1kHz
– 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 andDAC
•Programmable Function:– –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 ×f
S
cutoff frequency•Package: 32-pin TQFP•Operating Temperature Range: –25 °C to +85 °C
Description 10 SBAU141 – January 2009Submit Documentation Feedback

1.2 Pin Assignments and Terminal Functions
PCM2912APJT
(32-pin TQFP)
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
32
10
31
11
30
12
29
13
28
14
27
15
26
16
25
PGND VIN
VCCP VCCA
TEST1 NC
TEST0 AGND
SSPND VCOM2
MMUTE VCOM1
REC FR
PLAY FL
BGND
VBUS
D-
D+
VDD
DGND
XTO
XTI
POWER MAMP V R
OUT
VCCR HGND VCCL V L
OUT
MBIAS
PCM2912APJT
(Top View)
www.ti.com Pin Assignments and Terminal Functions
Figure 1-1 shows the pin assignments for the PCM2912A. Table 1-1 lists the terminal functions.
Figure 1-1. PCM2912A Pin Assignments
Table 1-1. PCM2912A Terminal Functions
TQFP-36Name Terminal I/O Description
BGND 1 – Reference for internal regulatorV
BUS
2 – Connect to USB power (V
BUS
)D– 3 I/O USB differential input/output minusD+ 4 I/O USB differential input/output plusV
DD
5 – Digital power supplyDGND 6 Digital groundXTO 7 O Crystal oscillator outputXTI 8 I Crystal oscillator inputFL 9 – External filter pin of left channel (optional)FR 10 – External filter pin of right channel (optional)V
COM1
11 – Common voltage for ADC, DAC and analog front-end (V
CCA
/2). Decoupling capacitor shouldbe connected to AGND.V
COM2
12 – Common voltage for headphone (V
CCA
/2). Decoupling capacitor should be connected toAGND.AGND 13 – Analog groundNC 14 – Not connectedV
CCA
15 – Analog power supplyV
IN
16 I ADC microphone inputMBIAS 17 O Microphone bias output (0.75 V
CCA
)V
OUT
L 18 O Headphone output for L-channelV
CCL
19 – Analog power supply for headphone amplifier of L-channelHGND 20 – Analog ground for headphone amplifier
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Pin Assignments and Terminal Functions www.ti.com
Table 1-1. PCM2912A Terminal Functions (continued)
TQFP-36Name Terminal I/O Description
V
CCR
21 -– Analog power supply for headphone amplifier of R-channelV
OUT
R 22 O Headphone output for R-channelMAMP 23 I Microphone preamplifier gain control (LOW: Preamplifier off; HIGH: Preamplifier on = +20dB)POWER 24 I Power consumption declaration select pin (LOW: 100 mA; HIGH: 500 mA)PGND 25 – Analog ground for microphone bias, microphone amplifier, and PGAV
CCP
26 – Analog power supply for PLLTEST1 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)
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1.3 Functional Block Diagram
S
S
XTI XTO
6.000 MHz
96 MHz
PLL (x16) Tracker
(SpAct )
â
USB protocol
controller
ISO-out
endpoint
Control
endpoint
ISO-in
endpoint
FIFO
FIFO XCVR
Selector
Selector
Analog
PLL
Analog
PLL
USB SIE
VREF
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
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
www.ti.com Functional Block Diagram
Figure 1-2 illustrates the functional block diagram of the DEM-PCM2912A EVM.
Figure 1-2. DEM-PCM2912A EVM Functional Block Diagram
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Description 14 SBAU141 – January 2009Submit Documentation Feedback

Chapter 2SBAU141 – January 2009
Getting Started
This chapter provides information regarding handling and unpacking the DEM-PCM2912A EVM, as wellas the EVM absolute operating conditions and a description of the factory default switch and jumperconfigurations.
Topic .................................................................................................. Page
2.1 Electrostatic Discharge Warning ................................................. 162.2 Block Diagram .......................................................................... 162.3 Interface and Connections ......................................................... 16
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2.1 Electrostatic Discharge Warning
2.2 Block Diagram
PC
USB
Connector
D2 D1
SW1
JP1
J1
JP2
J2
PCM2912A
PCM2912A-EVM
Mic
Headphone
CN1
D+, D-
PLAY
REC
VIN
V L/R
OUT
POWER
MMUTE MAMP
2.3 Interface and Connections
Electrostatic Discharge Warning www.ti.com
Many of the components on the DEM-PCM2912A EVM are susceptible to damage by electrostaticdischarge (ESD). Customers are advised to observe proper ESD handling precautions when unpackingand 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 EVMcomponents.
Figure 2-1 illustrates the DEM-PCM2912A EVM block diagram and the default external equipmentconnection configuration.
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 AJ1 Mono microphone inputJ2 Headphone output terminalD1 LED (red); record indicator (flash while muting)D2 LED (green); playback indicator (flash while muting)SW1 Microphone mute switch
(1)
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 Indisplay on a Windows-based PC; the operating system does not support an HID function.
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Chapter 3SBAU141 – January 2009
Set-Up Guide
This chapter discusses how to set up the DEM-PCM2912A EVM on personal computers (PCs) equippedwith any of a variety of major operating systems, including Microsoft Windows Vista
®
, Windows XP
®
, andMacintosh
®
OS X and later.
Topic .................................................................................................. Page
3.1 Basic Operating Set-Up—Windows Vista ..................................... 183.2 Basic Operating Set-Up—Windows XP ........................................ 233.3 Basic Operating Set-Up—Mac OS ............................................... 27
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3.1 Basic Operating Set-Up—Windows Vista
3.1.1 Basic Setup Before Evaluation
Basic Operating Set-Up—Windows Vista www.ti.com
This section reviews how to set up the DEM-PCM2912A EVM for use with a PC equipped with theMicrosoft Vista Basic (or higher) operating system.
When the installation is complete, the EVM software is ready to use.
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 (orhub) port on the lab PC. The DEM-PCM2912A EVM can be connected directly to the PCwithout an additional USB cable.After the EVM is connected to the PC, the standard Windows Vista driver installsautomatically 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 groupfrom the Control Panel.Step 3. Select the playback tab and confirm the USB audio codec appearance as the defaultplayback device, as shown in Figure 3-1 .Step 4. Select the recording tab and confirm the USB audio codec appearance as the defaultrecording device, as shown in Figure 3-2 .
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
www.ti.com Basic Operating Set-Up—Windows Vista
Follow these steps to configure the volume settings for headphones, microphone, and the recordingoptions.
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 theLevels 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 theLevels tab, as Figure 3-3 illustrates.Step 3. Set the volume and the mute levels for the microphone sidetone from –76 dB to 0 dB.
Figure 3-3. Speakers Properties—Levels Tab (Windows Vista)
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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 selectthe 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 EVMis plugged in/out.
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