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Texas Instruments TPA2008D2EVM - (Rev. A) User guides
 User’s Guide
May 2004
Mixed-Signal Products
SLOU116A
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Mailing Address:
Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright  2004, Texas Instruments Incorporated
EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the 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.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user
indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction
of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic
discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE
TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not
exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.
Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any
machine, process, or combination in which such TI products or services might be or are used.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright  2004, Texas Instruments Incorporated
EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the 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.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user
indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction
of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic
discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE
TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not
exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.
Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any
machine, process, or combination in which such TI products or services might be or are used.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright  2003, Texas Instruments Incorporated
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the supply voltage range specified in the user’s guide.
The supply voltage range should be 4.5 V to 5.5 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
85°C. The EVM is designed to operate properly with certain components above 85°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.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright  2004, Texas Instruments Incorporated
-5
Preface
How to Use This Manual
This document contains the following chapters:
- Chapter 1—Introduction
- Chapter 2—Operation
- Chapter 3—Reference
Information About Cautions and Warnings
This book may contain cautions and warnings.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.
This is an example of a warning statement.
A warning statement describes a situation that could potentially
cause harm to you.
The information in a caution or a warning is provided for your protection.
Please read each caution and warning carefully.
Read This First
i
Running Title—Attribute Reference
Related Documentation From Texas Instruments
J
TI Plug-N-Play Audio Amplifier Evaluation Platform (literature
number SLOU011) provides detailed information on the evaluation
platform and its use with TI audio evaluation modules.
J
TPA2008D2 3-W STEREO CLASS-D AUDIO POWER
AMPLIFIER (literature number SLOS413) This is the data sheet
for the TPA2008D2 audio amplifier integrated circuit.
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 will be required to take whatever measures
may be required to correct this interference.
ii
Running Title—Attribute Reference
Contents
1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1
Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3
TPA2008D2 EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
1-2
1-3
1-4
2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2
Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3
Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1
2-2
2-3
2-4
2-6
3
Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1
TPA2008D2 EVM Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2
TPA2008D2 EVM PCB Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3
TPA2008D2 EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4
DC Volume Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1
3-2
3-3
3-4
3-5
Chapter Title—Attribute Reference
iii
Running Title—Attribute Reference
Figures
1−1
1−2
2−1
2−2
2−3
3−1
3−2
3−3
TPA2008D2 Audio Power Amplifier EVM Without Output Filter — Top View . . . . . . . . . . .
TPA2008D2 Audio Power Amplifier EVM Without Output Filter — Bottom View . . . . . . . .
Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Quick Start for Stand-Alone Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TPA2008D2 Filter-Free Class-D EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .
TPA2008D2 Filter-Free Class-D EVM Top Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TPA2008D2 Filter-Free Class-D EVM Bottom Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3
1-3
2-2
2-4
2-5
3-2
3-3
3-3
Tables
2−1
2−2
3−1
3−2
iv
Typical Texas Instruments Plug-N-Play Platform Jumper and Switch Settings for the
TPA2008D2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Platform Jumper and Switch Settings for the TPA2008D2 . . . . . . . . . . . . . . . . . . . . . . . . . .
TPA2008D2 EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TPA2008D2 EVM Volume Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1
2-3
3-4
3-5
Chapter 1
Introduction
This chapter provides an overview of the Texas Instruments (TI) TPA2008D2
stereo filter-free class-D audio amplifier evaluation module (SLOP392). It
includes a list of EVM features, a brief illustrated description of the module, and
a list of EVM specifications.
Topic
Page
1.1
Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−2
1.2
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−3
1.3
TPA2008D2 EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−4
Introduction
1-1
Feature Highlights
1.1 Feature Highlights
The TI TPA2008D2 audio amplifier evaluation module and the TI plug-n-play
audio amplifier evaluation platform include the following features:
- TPA2008D2 Stereo 3-W Filter-Free Class-D Audio Power Amplifier
Evaluation Module
J
Class-D without output filter
J
Internal depop circuitry to minimize transients in outputs
J
High efficiency
J
Low distortion
J
Low supply current (7 mA)
J
3 W per channel output power into 3 Ω at 5 V
J
Low current consumption in shutdown mode
J
DC volume control from −38 dB to 20 dB
J
Differential stereo inputs
J
24-pin TSSOP PWP package
- Quick and Easy Configuration With the TI Plug-N-Play Audio Amplifier
Evaluation Platform
J
Evaluation module is designed to simply plug into the platform,
automatically making all signal, control, and power connections
J
Platform provides flexible power options
J
Jumpers on the platform select power and module control options
J
Switches on the platform route signals
J
Platform provides quick and easy audio input and output connections
- Platform Power Options
J
External 5-V − 15-V dc VCC supply inputs
J
External regulated VDD supply input
J
Socket for onboard 5 V/3.3 V VDD voltage regulator EVM
J
Onboard overvoltage and reverse polarity power protection
- Platform Audio Input and Output Connections
1-2
J
Left and right RCA phono jack inputs
J
Miniature stereo phone jack input
J
Left and right RCA phono jack outputs
J
Left and right compression speaker terminal outputs
J
Miniature stereo headphone jack output
Introduction
Description
1.2 Description
The TPA2008D2 filter-free class-D stereo audio power amplifier evaluation
module is a complete, 3-W per channel class-D stereo audio power amplifier
that can operate without an output filter. It consists of the TI TPA2008D2
class-D stereo 3-W audio power amplifier IC along with a small number of
other parts mounted on a circuit board that measures approximately 2-1/4
inches by 1-1/2 inches.
Figure 1−1. TPA2008D2 Audio Power Amplifier EVM Without Output Filter—Top View
Figure 1−2. TPA2008D2 Audio Power Amplifier EVM Without Output Filter—Bottom View
Single in-line header pins extend from the underside of the module circuit
board to allow the EVM to be plugged into the TI plug-n-play audio amplifier
evaluation platform, or to be wired directly into existing circuits and equipment
when used stand-alone.
Introduction
1-3
TPA2008D2 EVM Specifications
The platform has room for a single TPA2008D2 evaluation module and is a
convenient vehicle for demonstrating TI’s audio power amplifier and related
evaluation modules. The EVMs simply plug into the platform, which
automatically provides power to the modules, interconnects them correctly,
and connects them to a versatile array of standard audio input and output jacks
and connectors. Easy-to-use configuration controls allow the platform and
EVMs to quickly model many possible end-equipment configurations.
There is nothing to build, nothing to solder, and nothing but the speakers
included with the platform to hook up.
1.3 TPA2008D2 EVM Specifications
Supply voltage range, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 V to 5.5 V
Supply current, IDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 A max
Continuous output power per channel, PO: 3 Ω, VDD = 5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 W
Minimum load impedance, RL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Ω
1-4
Introduction
Chapter 2
Operation
The steps in this chapter can be followed to quickly prepare the TPA2008D2
stereo filter-free class-D audio amplifier EVM for use. Using the TPA2008D2
with the TI plug-n-play audio amplifier evaluation platform is a quick and easy
way to connect power, signal and control inputs, and signal outputs to the EVM
using standard connectors. However, the audio amplifier evaluation module
can be used stand-alone by making connections directly to the module pins,
and can be wired directly into existing circuits or equipment.
The platform switch and jumper settings shown in Table 2−1 are typical for the
TPA2008D2 EVM and causes the TPA2008D2 to shut down when a plug is inserted into platform headphone jack J10.
Table 2−1. Typical TI Plug-N-Play Platform Jumper and Switch Settings for the
TPA2008D2
EVM
JP4
JP5
JP6
JP7
JP8
S2
S3
P-N-P Platform
X
ON
Mute
X
Lo
Note 2
U5
Notes:
1) ON = Jumper installed, OFF = Jumper NOT Installed, X = Don’t care
2) Set S2 to ON when signal conditioning board is installed in U1; set S2
to OFF when no signal conditioning board is installed.
Topic
Page
2.1
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−2
2.2
Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−3
2.3
Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−4
2.4
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−6
Operation
2-1
Precautions
2.1 Precautions
Power Supply Input Polarity and Maximum Voltage
Always ensure that the polarity and voltage of the external power
connected to VCC power input connector J1, J2, and/or VDD power
input connector J6 are correct. Overvoltage or reverse-polarity
power applied to these terminals can open onboard soldered-in
fuses and cause other damage to the platform, installed evaluation
modules, and/or the power source.
Inserting or Removing EVM Boards
Do not insert or remove EVM boards with power applied—damage
to the EVM board, the platform, or both may result.
Figure 2−1. Quick Start Platform Map
7b
1 13
C1+
On
Off
7b
ICC
VR2
JP4
+
J6
+
JP6
U5
JP7
HP(U5)
U2-U4
HP Out
Headphone
Output
J10
+
R3
R4
6
5
Stereo
+
S3
HP
Source
Left
J9 Out
Spk(U2-U4)C3 C2
JP8
Mode
Mute
Polarity
Lo
Hi
U4
U5
GND
2
TP1
Plug-N-Play Audio Amplifier
Evaluation Platform
SLOP097 Rev. C.1
10
Speaker
Output
− Left
Out
On
Conditioning
TEXAS
INSTRUMENTS
1997
2-2
VDD
In/Out
U2
U1
J5
Left
In
****CAUTION****
Do not insert or remove
EVM boards with power
applied
3
+ Right −
Out
U3
Off
S2
J4
Stereo
In
Audio
Input
DC
Power
In/Out
J8
J7 Right
Out
LED2
VDD
Audio
Power
Amps
Signal Conditioning
9
R2
JP5
IDD
LED1
VCC
J3
Right
In
R1
7a
F2
B1
D1
D2
D3
D4 J2
AC/DC
In
Power
Input
U6
7b
POWER
S1
SUPPLY
VR1
Pwr
J1
VCC
In
+
JP3
Batt
JP2
AC/DC
JP1 (J2)
VCC(J1)
DC
SOURCE
F1
7b
R5
4
Operation
Quick Start List for Platform
2.2 Quick Start List for Platform
Follow these steps when using the TPA2008D2 EVM with the TI plug-n-play
audio amplifier evaluation platform (see the platform user’s guide, literature
number SLOU011, for additional details). Numbered callouts for selected
steps are shown in Figure 2−2, and details appear in Chapter 3.
- Platform preparations
1) Ensure that all external power sources are set to OFF and that the platform
power switch S1 is set to OFF.
2) Install a TPA2008D2 module in platform socket U2, taking care to align the
module pins correctly.
3) Use switch S2 to select or bypass the signal conditioning EVM (U1).
4) Set control signal Polarity jumper JP8 to Lo.
5) Set jumper JP6 to select the Mute control input (causes the TPA2008D2
to shut down if a plug is inserted into platform headphone jack J10).
6) If a headphone amplifier will be installed in U5, set the headphone source
switch S3 to U5.
Table 2−2. Platform Jumper and Switch Settings for the TPA2008D2
EVM
JP4
JP5
JP6
JP7
JP8
S2
S3
P-N-P Platform
X
ON
Mute
X
Lo
Note 2
U5
Notes:
1) ON = Jumper installed, OFF = Jumper NOT Installed, X = Don’t care
2) Set S2 to ON when signal conditioning board is installed in U1; set S2
to OFF when no signal conditioning board is installed.
- Power supply
7) Select and connect the power supply (ensure power supply is set to OFF ):
a) Connect an external regulated power supply set to 5 V to platform VDD
power input connector J6 taking care to observe marked polarity,
or
b) Install a voltage regulator EVM (SLVP097 or equiv.) in platform socket
U6. Connect a 7-V − 12-V power source to a platform VCC power input
J1 or J2 and jumper the appropriate power input (see platform user’s
guide). If using J1, J2, or B1, set S1 to ON to supply power to the EVM.
- Inputs and outputs
8) Ensure that the audio signal source level is set to minimum.
9) Connect the audio source to left and right RCA phono jacks J3 and J5 or
stereo miniature phone jack J4.
10) Connect speakers to left and right RCA jacks J7 and J9 or to stripped wire
speaker connectors J8.
Operation
2-3
Quick Start List for Stand-Alone
- Evaluation Module Preparations
11) Use potentiometer R3 to set the volume. Turning R3 in the clockwise
direction will increase the volume. See Table 3−1 for voltage levels on the
VOLUME pin and corresponding gain settings.
12) If using an external DAC, adjust R3 to the center position by placing a
DMM across the VOLUME pin and ground and adjusting the
potentiometer until 25 kΩ is measured across the leads. Apply the external
source to the VOLUME pin. Be sure to use the board VDD as a reference
for the DAC. Also connect the reference GND of the DAC to the GND
terminal of the EVM.
Figure 2−2. Module Preparation
12
- Power Up
13) Verify correct voltage and input polarity and set the external power supply
to ON. If VCC and an on-board regulator EVM are used to provide VDD, set
platform power switch S1 to ON.
Platform LED2 should light indicating the presence of VDD, and the evaluation
modules installed on the platform should begin operation.
14) Adjust the signal source level and potentiometer R3 as needed.
2.3 Quick Start List for Stand-Alone
Follow these steps to use the TPA2008D2 EVM stand-alone or when
connecting it into existing circuits or equipment. Connections to the
TPA2008D2 module header pins can be made via individual sockets,
wire-wrapping, or soldering to the pins, either on the top or the bottom of the
module circuit board. Numbered callouts for selected steps are shown in
Figure 2−3.
2-4
Operation
Quick Start List for Stand-Alone
Figure 2−3. Quick Start for Stand-Alone
6
Audio
Input
(Right)
Audio
Input
(Left)
7
Right
5
4
External Shut
Down Control
(active low)
8
4
5
Left
5V 2
- Power supply
1) Ensure that all external power sources are set to OFF.
2) Connect an external regulated power supply set to 5 V to the module VDD
and GND pins taking care to observe marked polarity.
- Inputs and outputs
3) Ensure that audio signal source level adjustments are set to minimum.
4) Connect the right (left) positive lead of the audio source to the module
RIN+ (LIN+) pins and the negative lead to the RIN− (LIN−) pins.
5) Connect speakers to the left and right outputs.
- Evaluation module preparations
6) Use potentiometer R3 to set the volume. Turning R3 in the clockwise
direction will increase the volume. See Table 3−1 for voltage levels on the
VOLUME pin and corresponding gain settings.
7) If using an external DAC, adjust R3 to the center position by placing a
DMM across the VOLUME pin and ground and adjusting the
potentiometer until 25 kΩ is measured across the leads. Apply the external
source to the VOLUME pin. Be sure to use the board VDD as a reference
for the DAC. Also connect the reference GND of the DAC to the GND
terminal of the EVM.
- Control inputs
8) SHUTDOWN: A low shuts down the amplifier IC on the module; a high or
float allows normal operation.
- Power up
9) Verify correct voltage and input polarity and set the external power supply
to ON.
Operation
2-5
Power Requirements
The EVM should begin operation.
10) Adjust the signal source level and potentiometer R3 as needed.
2.4 Power Requirements
The TPA2008D2 audio power amplifier evaluation module can operate from
any voltage between approximately 4.5 V and 5.5 V; however, the TPA2008D2
amplifier IC on the module is characterized for operation at 5 V. For best
performance (highest output power with lowest distortion), the module should
be operated at 5 V.
The TI plug-n-play audio amplifier evaluation platform with a voltage regulator
EVM installed on it can provide a regulated VDD supply from a wide variety of
unregulated VCC voltage inputs between 5.5 V and 12 V, including an onboard
9 -V battery. Alternatively, an external regulated power source can be used to
supply VDD voltage to the platform and the TPA2008D2 evaluation module
installed on it.
Although the TPA2008D2 amplifier IC draws approximately 1 A from the power
supply during continuous full power output, peak current draw can be as high
as 2 A. Any power supply connected to the platform should be capable of
providing 2 A of current to avoid clipping of the output signal during peaks.
Current consumption driving speakers at normal listening levels is typically
0.1 A or less.
The platform is equipped with overvoltage and reverse-polarity supply voltage
input protection in the form of fused crowbar circuits.
- VDD voltage applied to platform screw terminals J6 MUST NOT exceed
the absolute maximum rating for the TPA2008D2 amplifier IC installed on
the evaluation module (6 V) or damage to the IC may result. In no case
should VDD voltage of the incorrect polarity or in excess of 6.1 V be applied
to screw terminals J6 of the platform, or the power protection circuit on the
VDD line will trip.
- VCC voltage applied to the platform MUST NOT exceed the maximum
voltage input specified for the voltage regulator module installed in socket
U6 (12 V for the SLVP097), or damage to the voltage regulator module
may result. In no case should VCC voltage applied to the platform exceed
15 V, or the overvoltage protection circuit on the VCC bus will trip.
2-6
Operation
Chapter 3
Reference
This chapter contains the EVM schematic, PCB layers, parts list, and dc
volume control table.
Topic
Page
3.1
TPA2008D2 EVM Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−2
3.2
TPA2008D2 EVM PCB Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−3
3.3
TPA2008D2 EVM Parts LIst . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−4
3.4
DC Volume Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−5
Reference
3-1
TPA2008D2 EVM Schematic
3.1 TPA2008D2 EVM Schematic
Figure 3−1. TPA2008D2 Filter-Free Class-D EVM Schematic Diagram
U1
TPA2008D2
C3
LIN−
C4
0.1 µF
LIN+
0.1 µF
SHUTDOWN
SHUTDOWN
R1
120 kΩ
C2
1
S1
2 LINP
3
4
5
6
VDD
LOUT+
GND
7
C7
1 µF
C11
10 µF
LOUT−
8
9
10
11
C6
220 pF
R2
120 kΩ
LINN
SHUTDOWN
PVDD
LOUTP
PGND
PGND
LOUTN
PVDD
RINN
RINP
BYPASS
PVDD
ROUTP
PGND
PGND
ROUTN
PVDD
COSC
NC
ROSC
VOLUME
24
23 0.1 µF
AGND
VDD
RIN+
0.1 µF
22
21
C5
1 µF
20
ROUT+
19
GND
C9
1 µF
18
17
ROUT−
16
VDD
15
14
VOLUME
CW
12
RIN−
C1
13
CCW
R3 50 kΩ
C8
1 µF
VDD
C10
DNI
GND
3-2
Reference
TPA2008D2 EVM PCB Layers
3.2 TPA2008D2 EVM PCB Layers
Figure 3−2 and Figure 3−3 depict the TPA2008D2 EVM PCB layers. These
drawings are not to scale. Gerber plots can be obtained from any TI sales
office.
Figure 3−2. TPA2008D2 EVM Top Assembly
Figure 3−3. TPA2008D2 EVM Bottom Assembly
Reference
3-3
TPA2008D2 EVM Parts List
3.3 TPA2008D2 EVM Parts List
Table 3−1. TPA2008D2 EVM Parts List
Size
EVM
Qty.
C1, C2, C3, Capacitor, 0.1 µF, ±5%,
C4
X7R, 16 V
603
4
Panasonic
ECJ−1VB1C104K
Digi-Key
PCC1762CT−ND
C5, C7, C8, Capacitor, 1 µF,
C9
80%/−20%, Y5V, 10 V
603
4
Panasonic
ECJ−1VF1A105Z
Digi-Key
PCC1787CT−ND
Digi-Key
PCC221ACVCT−ND
Reference
Description
Manufacturer/
Part Number
Vendor/
Part Number
C10
No not install
C6
Capacitor, 220 pF, ±5%,
X7R, 50 V
603
1
Panasonic
ECJ−1VC1h221J
C11
Capacitor, 10 µF,
80%/−20%, Y5V, 16 V
1210
1
Murata
Arrow
GRM23SY5V106Z016AK GJ232NF51C106ZD
01
R1, R2
Resistor, 120 kΩ,
1/16 W, 5%
603
2
Panasonic
ERJ−3GEYJ124V
Digi-Key
P120K6CT−ND
R3
Potentiometer, 50 kΩ,
Cermet ST SL, thru hole
1
Bourns
3362P−1−503
Digi-Key
3362P−503−ND
S1
Switch, momentary
pushbutton, 12 V, 50 mA
SMD
1
Panasonic
EVQ−PPBA25
Digi-Key
P8086SCT−ND
Headers, 0.1 in centers,
1/2 in long
0.5 X
0.25 X
0.1”
13
Sullin
PTC36SABN
Digi-Key
S1022−36−ND
1
Farrell
240−345
TP1
Test point, 0.040”
mounting hole
U1
IC, 3-W, stereo class-D
audio power amplifer
24-pin
TSSOP
1
TI
TPA2008D2PWP
PCB
PCB, 2 layer, fits U2 on
PnP
2.25” X
1.25”
1
TI
TPA2008D2EVM
3-4
Reference
DC Volume Table
3.4 DC Volume Table
Table 3−2. DC Volume Control
Voltage on VOLUME Pin (V)
(Increasing or Fixed Gain)
Voltage on VOLUME Pin (V)
(Decreasing Gain)
Gain of Amplifier
(dB)(1)
0−0.33
0.31−0
−38(2)
0.34−0.42
0.43−0.32
−37
0.43−0.52
0.54−0.44
−35
0.53−0.63
0.64−0.55
−33
0.64−0.75
0.75−0.65
−31
0.76−0.86
0.86−0.76
−29
0.87−0.97
0.97−0.87
−27
0.98−1.07
1.08−0.98
−25
1.08−1.18
1.19−1.09
−23
1.19−1.30
1.32−1.20
−21
1.31−1.41
1.42−1.33
−19
1.42−1.52
1.53−1.43
−17
1.53−1.63
1.63−1.54
−15
1.64−1.75
1.75−1.64
−13
1.76−1.85
1.84−1.76
−12
1.86−1.96
1.96−1.85
−10
1.97−2.07
2.09−1.97
−8
2.08−2.18
2.19−2.10
−6
2.19−2.30
2.33−2.20
−4
2.31−2.40
2.43−2.34
−2
2.41−2.52
2.49−2.44
0(2)
2.53−2.63
2.62−2.50
2
2.64−2.75
2.75−2.63
4
2.76−2.87
2.85−2.76
6
2.88−2.98
2.99−2.86
8
2.99−3.10
3.12−3.00
10
3.11−3.22
3.25−3.13
12
3.23−3.33
3.36−3.26
14
3.34−3.47
3.48−3.37
16
1)
2)
3.48−3.69
3.64−3.49
18
3.70−VDD
VDD−3.65
20(2)
The Typiocal part-to-part variation can be as large as ±2dB (one gain step)
Tested in production
Reference
3-5
3-6
Reference
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