DEM-PCM2912A EVM
User's Guide
Literature Number: SBAU141
January 2009
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Contents
Preface ............................................................................................................................... 7
1
Description ................................................................................................................ 9
Introduction—PCM2912A ................................................................................................ 10
1.1.1 Key Features....................................................................................................... 10
Pin Assignments and Terminal Functions .............................................................................. 11
Functional Block Diagram................................................................................................. 13
1.1
1.2
1.3
2
Getting Started ......................................................................................................... 15
Electrostatic Discharge Warning ......................................................................................... 16
Block Diagram .............................................................................................................. 16
Interface and Connections ................................................................................................ 16
2.1
2.2
2.3
3
Set-Up Guide ........................................................................................................... 17
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
Basic Operating Set-Up—Windows XP ................................................................................. 23
3.2.1 Basic Setup Before Evaluation .................................................................................. 23
3.2.2 Volume Settings ................................................................................................... 24
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
3.1
3.2
3.3
4
Evaluation and Measurements ................................................................................... 33
Measurements for Dynamic Characteristics ............................................................................ 34
Playback Performance..................................................................................................... 34
Recording Performance ................................................................................................... 36
4.1
4.2
4.3
5
Schematic, PCB Layout, and Bill of Materials ............................................................... 37
Schematics.................................................................................................................. 38
Printed Circuit Board Layout.............................................................................................. 39
Component List............................................................................................................. 40
5.1
5.2
5.3
Important Notices............................................................................................................... 42
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List of Figures
1-1
1-2
2-1
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
PCM2912A Pin Assignments ............................................................................................. 11
DEM-PCM2912A EVM Functional Block Diagram..................................................................... 13
DEM-PCM2912A EVM Block Diagram .................................................................................. 16
Sound—Playback Tab (Windows Vista)................................................................................. 18
Sound—Recording Tab (Windows Vista) ............................................................................... 18
Speakers Properties—Levels Tab (Windows Vista) ................................................................... 19
Microphone Properties—Levels Tab (Windows Vista) ................................................................ 20
Speakers Properties—Advanced Tab (Windows Vista)............................................................... 21
Microphone Properties—Advanced Tab (Windows Vista) ............................................................ 22
Sound and Audio Devices Properties—Audio Tab (Windows XP) .................................................. 23
Sound and Audio Devices Properties—Volume Tab (Windows XP) ................................................ 24
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
4-2
4-3
5-1
5-2
5-3
5-4
DEM-PCM2912A EVM Configuration for Playback Performance Measurement .................................. 34
DEM-PCM2704EVM Configuration for Recording Performance Measurement with Recorded Data ........... 36
DEM-PCM2912A EVM Schematic ....................................................................................... 38
DEM-PCM2912A EVM Board Layout—Silkscreen .................................................................... 39
DEM-PCM2912A EVM Board Layout—Component Side............................................................. 39
DEM-PCM2912A EVM Board Layout—Inner View .................................................................... 39
4
List of Figures
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List of Tables
1-1
2-1
4-1
4-2
4-3
4-4
5-1
PCM2912A Terminal Functions .......................................................................................... 11
DEM-PCM2912A EVM Connectors...................................................................................... 16
Line Output Playback Performance...................................................................................... 35
32-Ω Headphone Output Playback Performance ...................................................................... 35
16-Ω Headphone Output Playback Performance ...................................................................... 35
Line Input Recording Performance....................................................................................... 36
Bill of Materials ............................................................................................................. 40
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List of Tables
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Preface
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Read This First
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.
features are also discussed.
conditions, and the default switch and jumper configuration.
information needed to configure the EVM under various PC operating systems for product evaluation.
using an audio analyzer.
Chapter 5 includes the EVM electrical schematic, printed circuit board (PCB) layout, and the bill of
materials.
Information About Cautions and Warnings
This document contains caution statements.
CAUTION
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.
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Related Documentation From Texas Instruments
Related Documentation From Texas Instruments
The following documents provide information regarding Texas Instruments integrated circuits used in the
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.
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 the
accompanying documentation, please contact the Texas Instruments Product Information Center at (972)
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.
Trademarks
All trademarks are the property of their respective owners.
8
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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
1.2
1.3
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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 Logo License certification from the
Microsoft Windows Hardware Quality Labs (WHQL). The DEM-PCM2912A has successfully passed the
®
Microsoft WLP test (DTM Audio) for Windows Vista x86/x64 platforms.
1.1.1 Key Features
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 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
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 ×fS cutoff frequency
•
•
Package: 32-pin TQFP
Operating Temperature Range: –25°C to +85°C
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Pin Assignments and Terminal Functions
1.2 Pin Assignments and Terminal Functions
PCM2912APJT
(Top View)
24 23 22 21 20 19 18 17
16
VIN
25
PGND
15 VCCA
14 NC
VCCP 26
TEST1 27
TEST0 28
SSPND 29
MMUTE 30
REC 31
13 AGND
12 VCOM2
11 VCOM1
10 FR
PCM2912APJT
(32-pin TQFP)
9
FL
PLAY 32
1
2
3
4
5
6
7
8
Figure 1-1. PCM2912A Pin Assignments
Table 1-1. PCM2912A Terminal Functions
TQFP-36
Terminal
Name
BGND
I/O
Description
1
2
–
–
Reference for internal regulator
Connect to USB power (VBUS
VBUS
D–
)
3
I/O
I/O
–
USB differential input/output minus
USB differential input/output plus
Digital power supply
D+
4
VDD
DGND
XTO
XTI
5
6
Digital ground
7
O
I
Crystal oscillator output
Crystal oscillator input
8
FL
9
–
–
–
External filter pin of left channel (optional)
External filter pin of right channel (optional)
FR
10
11
VCOM1
Common voltage for ADC, DAC and analog front-end (VCCA/2). Decoupling capacitor should
be connected to AGND.
VCOM2
12
–
Common voltage for headphone (VCCA/2). Decoupling capacitor should be connected to
AGND.
AGND
NC
13
14
15
16
17
18
19
20
–
–
–
I
Analog ground
Not connected
VCCA
VIN
Analog power supply
ADC microphone input
MBIAS
O
O
–
–
Microphone bias output (0.75 VCCA
Headphone output for L-channel
)
VOUT
VCCL
L
Analog power supply for headphone amplifier of L-channel
Analog ground for headphone amplifier
HGND
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Pin Assignments and Terminal Functions
Table 1-1. PCM2912A Terminal Functions (continued)
TQFP-36
Terminal
Name
I/O
-–
O
I
Description
Analog power supply for headphone amplifier of R-channel
Headphone output for R-channel
VCCR
VOUT
21
22
23
R
MAMP
Microphone preamplifier gain control (LOW: Preamplifier off; HIGH: Preamplifier on = +20
dB)
POWER
PGND
VCCP
24
25
26
27
28
29
30
31
32
I
–
–
I
Power consumption declaration select pin (LOW: 100 mA; HIGH: 500 mA)
Analog ground for microphone bias, microphone amplifier, and PGA
Analog power supply for PLL
TEST1
TEST0
SSPND
MMUTE
REC
Test pin. Must be set to high.
I
Test pin. Must be set to low.
O
I
Suspend flag (LOW: Suspend; HIGH: Operational state)
Microphone mute control, active high (LOW: Mute off; HIGH: Mute on)
Status output for record (LOW: Record; FLASH: Mute on record; HIGH: Stop)
Status output for playback (LOW: Playback; FLASH: Mute on playback; HIGH: Stop)
O
O
PLAY
12
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Functional Block Diagram
1.3 Functional Block Diagram
BGND
VCCA/VCCP/VCCL/VCCR/VDD
AGND/HGND/PGND/DGND
Power
Manager
SSPND
VBUS
5 V to 3.3 V
Voltage
Regulator
VREF
MIC
Bias
PGA +30 dB to
-12 dB
MBIAS
VIN
D+
in 1-dB steps
MIC
Amp
ISO-in
endpoint
XCVR
D-
FIFO
ADC
Selector
USB SIE
Control
endpoint
POWER
MAMP
Analog
PLL
VCOM2
VCOM1
MMUTE
Analog
PLL
ATT 0 dB to -76 dB
in 1-dB steps with Mute
PLAY
REC
VOUT
L
S
Selector
DAC
ISO-out
endpoint
VOUTR
S
FIFO
HP AMP 15 mW (at 32 W)
ATT 0 dB to -76 dB
TEST0
TEST1
in 1-dB steps with Mute
USB protocol
controller
FL
FR
Tracker
(SpActâ)
96 MHz
PLL (x16)
6.000 MHz
XTI
XTO
Figure 1-2. DEM-PCM2912A EVM Functional Block Diagram
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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
2.3
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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.
CAUTION
Failure to observe ESD handling procedures may result in damage to EVM
components.
2.2 Block Diagram
connection configuration.
PC
Mic
J1
PCM2912A
D+, D-
VIN
PLAY
REC
VOUTL/R
POWER
USB
Connector
Headphone
J2
MMUTE MAMP
D2
D1
JP1
JP2
CN1
SW1
PCM2912A-EVM
Figure 2-1. DEM-PCM2912A EVM Block Diagram
2.3 Interface and Connections
Table 2-1. DEM-PCM2912A EVM Connectors
Connectors
Part/Description
CN1
J1
USB connector, type A
Mono microphone input
J2
Headphone output terminal
D1
LED (red); record indicator (flash while muting)
LED (green); playback indicator (flash while muting)
Microphone mute switch(1)
D2
SW1
JP1
JP2
Power select (L: 100 mA, H: 500 mA)
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.
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Chapter 3
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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 , Windows XP , and
Macintosh OS X and later.
®
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3.2
3.3
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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
Step 4. Select the recording tab and confirm the USB audio codec appearance as the default
Figure 3-1. Sound—Playback Tab
(Windows Vista)
Figure 3-2. Sound—Recording Tab
(Windows Vista)
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Basic Operating Set-Up—Windows Vista
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.
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
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.
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Basic Operating Set-Up—Windows Vista
3.1.3 Sampling Frequency
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
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
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)
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Basic Operating Set-Up—Windows XP
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
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
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 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
displayed) in the lower right-hand area of the Windows taskbar (at the bottom of the screen); see
2. Set the volume and the mute levels for the microphone sidetone from –76 dB to 0 dB, as shown in
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. 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. 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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Basic Operating Set-Up—Mac OS
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
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
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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Basic Operating Set-Up—Mac OS
3.3.2 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 Audio MIDI Settings options (Application→Utility→Set Audio MIDI), as illustrated in
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
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
®
microphone volume for sidetone from –76dB to 0dB.
Figure 3-15. QuickTime Audio Recording Controls
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
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
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.
30
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Basic Operating Set-Up—Mac OS
Figure 3-16. Audio Midi Setting Window (Mac OS)
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Set-Up Guide
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Chapter 4
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Evaluation and Measurements
This chapter discusses how to set up the DEM-PCM2912A EVM for performance evaluation using the
®
Audio Precision SYS-2722 audio analyzer. The process of measuring dynamic characteristics is then
presented, along with example characteristic data.
Topic .................................................................................................. Page
4.1
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33
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: VBUS = 5.0 V (Bus power setting)
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)
RL = 10 kΩ / 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)
PC
Playing test data at fS = 44.1 kHz by application software
Audio Precision
SYS-2722
(for example, Sound Recorder, Media Player, etc.)
Analog Analyzer
Mic
J1
PCM2912A
Headphone
J2
100 mA
Left ch
D2
D1
JP1
0 dB
JP2
SW1
USB
Connector
Right ch
RL
PCM2912A-EVM
Figure 4-1. DEM-PCM2912A EVM Configuration for Playback Performance Measurement
34
Evaluation and Measurements
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Playback Performance
Table 4-1. Line Output Playback Performance
Power Supply
Performance
Filter Setting
RL
VOUT
L
VOUTR
5.0 V
THD+N (0 dBFS at 400 Hz to 20 kHz
10 kΩ
0.0086%
0.0085%
1 kHz)
Pre-Anlr
SNR (BPZ input)
400 Hz to 20 kHz
Pre-Anlr
+ A-weighting
10 kΩ
10 kΩ
10 kΩ
92.1 dB
92.1 dB
DR (–60 dBFS
input)
400 Hz to 20 kHz
Pre-Anlr
+ A-weighting
90.3 dB
89.3 dB
90.5 dB
89.3 dB
Channel Separation 400 Hz to 20 kHz
(BPZ input for target Pre-Anlr
channel)
Table 4-2. 32-Ω Headphone Output Playback Performance
Power Supply
Performance
Filter Setting
RL
VOUT
L
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
Pre-Anlr
32 Ω
92.1 dB
92.1 dB
+ A-weighting
DR (–60 dBFS
input)
400 Hz to 20 kHz
Pre-Anlr
32 Ω
89.4 dB
89.4 dB
+ A-weighting
Table 4-3. 16-Ω Headphone Output Playback Performance
Power Supply
Performance
Filter Setting
RL
VOUT
L
VOUTR
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
Pre-Anlr
16 Ω
92.1 dB
92.1 dB
+ A-weighting
DR (–60 dBFS
input)
400 Hz to 20 kHz
Pre-Anlr
16 Ω
89.4 dB
89.3 dB
+ A-weighting
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Recording Performance
4.3 Recording Performance
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.
PC
Recording at fS = 44.1 kHz by application software
Audio Precision
SYS-2722
(for example, Sound Recorder, QuickTime, etc.)
Analog Generator
Unbalanced
Floating GND setting
Mic
J1
PCM2912A
Headphone
J2
100 mA
D2
D1
JP1
0 dB
JP2
SW1
USB
Connector
PCM2912A-EVM
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
PC
Volume gain = 0 dB
Audio Precision
SYS-2722
DEM-PCM2704EVM
USB
Connector
S/PDIF
Output
Digital Analyzer
Figure 4-3. DEM-PCM2704EVM Configuration for Recording Performance Measurement with Recorded
Data
Table 4-4. Line Input Recording Performance
Power Supply
Performance
THD+N (–1 dB at 1 kHz)
SNR (BPZ input)
Filter Setting
DOUT
0.008%
92.5 dB
5.0 V
400 Hz to 20 kHz LP
400 Hz to 20 kHz LP
+ A-weighting
DR (–60 dB input)
400 Hz to 20 kHz LP
+ A-weighting
90.5 dB
36
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Chapter 5
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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
5.2
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Schematics
5.1 Schematics
Figure 5-1. DEM-PCM2912A EVM Schematic
38
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Printed Circuit Board Layout
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.
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
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39
Component List
5.3 Component List
Table 5-1. Bill of Materials
Reference
Designator
Value
22 pF
Value2
Manufacturer
Taiyoyuden
Taiyoyuden
Taiyoyuden
Taiyoyuden
Taiyoyuden
Taiyoyuden
Taiyoyuden
Matsushita
Matsushita
Matsushita
Matsushita
Matsushita
Matsushita
Murata SS
Rohm
Mfr Part No
UMK107CH220JZ
UMK107CH220JZ
UMK107CH101JZ
UMK107CH101JZ
TMK107BJ223KA
TMK107BJ223KA
TMK105BJ104KV
ECJ-1VB1C105K
ECJ-1VB1C105K
ECJ-1VB1C105K
ECJ-1VB1C105K
ECJ-1VB1C105K
ECJ-1VB1C105K
GRM40B335K10PT
TCP0J106M8R
TCP0J106M8R
ECE-A0GKS101
ECE-A0GKS101
UAR10-4W5100
SLR342-VR
Remarks
C1
C2
50 V, 5%
50 V, 5%
22 pF
C4
100 pF
100 pF
0.022 µF
0.022 µF
0.1 µF
1 µF
50 V, 5%
C5
50 V, 5%
C13
C14
C7
25 V, 10%
25 V, 10%
25 V, 10%
16 V, 10%
16 V, 10%
16 V, 10%
16 V, 10%
16 V, 10%
16 V, 10%
10 V, 10%
6.3 V, 20%
6.3 V, 20%
4 V, 20%
C11
C12
C17
C18
C3
1 µF
1 µF
1 µF
1 µF
C8
1 µF
C10
C6
3.3 µF
10 µF
C9
10 µF
Rohm
C15
C16
CN1
D1
100 µF
100 µF
USB 'A'
LED
Matsushita
Matsushita
ACON
4 V, 20%
Host Interface
Rohm
Recording Indicator
playback Indicator
Stereo Headphone
Mic Input and Bias
D2
LED
Rohm
SLR342-MG
J1
Stereo mini Jack
Stereo mini Jack
16
SMK
LGY2502-0200
LGY2502-0200
RK73K1J-160J
J2
SMK
R11
R12
R1
5%
5%
5%
KOA
16
KOA
RK73K1J-160J
33
KOA
RK73K1J-330J
Should be adjusted
to meet USB spec.
R2
R17
R18
R19
R3
33
820
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
KOA
KOA
KOA
KOA
KOA
KOA
KOA
KOA
KOA
KOA
ALPS
TI
RK73K1J-330J
RK73K1J-821J
RK73K1J-821J
RK73K1J-102J
RK73K1J-152J
RK73K1J-332J
RK73K1J-332J
RK73K1J-332J
RK73K1J-332J
RK73K1J-105J
SKQTLBE010
820
1k
1.5k
R13
R14
R15
R16
R4
3.3k
3.3k
3.3k
3.3k
1M
SW1
U1
Tact SW
PCM2912APJT
Crystal
Jumper SW
Jumper SW
Mic Mute
Y1
6 MHz, ±30 ppm Epson
Hiroshe denshi
Hiroshe denshi
CA301 6.000M-C
JP2
JP3
A2-3PA2.54DSA(71)
A2-3PA2.54DSA(71)
40
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Component List
Table 5-1. Bill of Materials (continued)
Reference
Designator
Value
Value2
Manufacturer
Mac8
Mfr Part No
Remarks
TP1,
TP4–TP5,
TP12–TP15
Check pin
HK-4-S
HK-6-S
TP2–TP3,
TP6–TP11
Check pin
Mac8
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This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
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EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of –2.0 V to +4.0 V and the output voltage range of –2.0 V to +4.0 V.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions
concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.
Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than +60°C. The EVM is designed to operate
properly with certain components above +60°C as long as the input and output ranges are maintained. These components include but are
not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified
using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,
please be aware that these devices may be very warm to the touch.
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