Texas Instruments Stereo Amplifier TPA2008D2 User Manual

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User’s Guide  
July 2003  
Mixed-Signal Products  
SLOU116  
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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 Users 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  
oftheproduct, itistheusersresponsibilitytotakeanyandallappropriateprecautionswithregardtoelectrostatic  
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 Users Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM  
UsersGuidepriortohandlingtheproduct. Thisnoticecontainsimportantsafetyinformationabouttemperatures  
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  
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EVM WARNINGS AND RESTRICTIONS  
ItisimportanttooperatethisEVMwithinthesupplyvoltagerangespecifiedintheusersguide.  
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.  
Applyingloadsoutsideofthespecifiedoutputrangemayresultinunintendedoperationand/or  
possible permanent damage to the EVM. Please consult the EVM Users 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  
tolinearregulators, switchingtransistors, passtransistors, andcurrentsenseresistors. These  
types of devices can be identified using the EVM schematic located in the EVM Users 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 2003, Texas Instruments Incorporated  
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Preface  
How to Use This Manual  
This document contains the following chapters:  
- Chapter 1Introduction  
- Chapter 2Operation  
- Chapter 3Reference  
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  
iii  
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Running TitleAttribute Reference  
Related Documentation From Texas Instruments  
J
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.  
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.  
iv  
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Contents  
1
2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1  
1.1  
1.2  
1.3  
Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2  
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3  
TPA2008D2 EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4  
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1  
2.1  
2.2  
2.3  
2.4  
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2  
Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3  
Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4  
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6  
3
Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1  
3.1  
3.2  
3.3  
3.4  
TPA2008D2 EVM Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
TPA2008D2 EVM PCB Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
TPA2008D2 EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4  
DC Volume Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5  
v
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Figures  
11  
12  
21  
22  
23  
31  
32  
33  
The TI TPA2008D2 Audio Amplifier EVM Without Output Filter Top View . . . . . . . . . . . 1-3  
The TI TPA2008D2 Audio Amplifier EVM Without Output Filter Bottom View . . . . . . . . 1-3  
Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2  
Module Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4  
Quick Start for Stand-Alone Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5  
TPA2008D2 Filter-Free Class-D EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
TPA2008D2 Filter-Free Class-D EVM Top Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
TPA2008D2 Filter-Free Class-D EVM Bottom Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
Tables  
21  
22  
31  
32  
Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA2008D2 . . . . . . 2-1  
Platform Jumper and Switch Settings for the TPA2008D2 . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3  
TPA2008D2 EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4  
TPA2008D2 EVM Volume Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5  
vi  
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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  
includesalistofEVMfeatures, abriefillustrateddescriptionofthemodule, 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  
1-1  
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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
J
J
J
J
J
J
J
J
J
Class-D without output filter  
Internal depop circuitry to minimize transients in outputs  
High efficiency  
Low distortion  
Low supply current (7 mA)  
3 W per channel output power into 3 at 5 V  
Low current consumption in shutdown mode  
DC volume control from 38 dB to 20 dB in 2 dB steps  
Differential stereo inputs  
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
J
J
J
Platform provides flexible power options  
Jumpers on the platform select power and module control options  
Switches on the platform route signals  
Platform provides quick and easy audio input and output connections  
- Platform Power Options  
J
J
J
J
External 5-V 15-V dc V  
supply inputs  
CC  
External regulated V  
supply input  
DD  
Socket for onboard 5 V/3.3 V V  
voltage regulator EVM  
DD  
Onboard overvoltage and reverse polarity power protection  
- Platform Audio Input and Output Connections  
J
J
J
J
J
Left and right RCA phono jack inputs  
Miniature stereo phone jack input  
Left and right RCA phono jack outputs  
Left and right compression speaker terminal outputs  
Miniature stereo headphone jack output  
1-2  
Introduction  
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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 11. The TI TPA2008D2 Audio Amplifier EVM Without Output FilterTop View  
Figure 12. The TI TPA2008D2 Audio Amplifier EVM Without Output FilterBottom 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.  
1-3  
Introduction  
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TPA2008D2 EVM Specifications  
The platform has room for a single TPA2008D2 evaluation module and is a  
convenient vehicle for demonstrating TIs audio power amplifier and related  
evaluation modules. The EVMs simply plug into the platform, which  
automatically provides power to the modules, interconnects them correctly,  
andconnectsthemtoaversatilearrayofstandardaudioinputandoutputjacks  
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, V  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 V to 5.5 V  
DD  
Supply current, I  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 A max  
DD  
Continuous output power per channel, P : 3 , V  
= 5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 W  
O
DD  
Minimum load impedance, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Ω  
L
1-4  
Introduction  
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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 21 are typical for the  
TPA2008D2 EVM and causes the TPA2008D2 to shut down when a plug is in-  
serted into platform headphone jack J10.  
Table 21. 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 = Dont 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22  
2.2 Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
2.3 Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
2.4 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26  
2-1  
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Precautions  
2.1 Precautions  
Power Supply Input Polarity and Maximum Voltage  
Always ensure that the polarity and voltage of the external power  
connected to V  
power input connector J1, J2, and/or V  
power  
CC  
DD  
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 applieddamage  
to the EVM board, the platform, or both may result.  
Figure 21. Quick Start Platform Map  
7b  
1 13  
7b  
7b  
ICC  
JP4  
C1+  
F1  
VR1  
7a  
DC  
Power  
In/Out  
7b  
Power  
Input  
R2  
R1  
Audio  
Power  
Amps  
Signal Conditioning  
9
10  
Audio  
Input  
Speaker  
Output  
Mode  
Mute  
5
Polarity  
Lo  
****CAUTION****  
Do not insert or remove  
EVM boards with power  
applied  
Hi  
Stereo  
Headphone  
Output  
Plug-N-Play Audio Amplifier  
Evaluation Platform  
SLOP097 Rev. C.1  
R3  
R4  
HP Out  
R5  
3
2
6
4
2-2  
Operation  
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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 users guide, literature  
number SLOU011, for additional details). Numbered callouts for selected  
steps are shown in Figure 22, and details appear in Chapter 3.  
- Platform preparations  
1) EnsurethatallexternalpowersourcesaresettoOFFandthattheplatform  
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 22. Platform Jumper and Switch Settings for the TPA2008D2  
EVM  
P-N-P Platform  
JP4  
JP5  
ON  
JP6  
Mute  
JP7  
JP8  
S2  
S3  
X
X
Lo  
Note 2  
U5  
Notes: 1) ON = Jumper installed, OFF = Jumper NOT Installed, X = Dont 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) Connectanexternalregulatedpowersupplysetto5VtoplatformV  
DD  
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 V power input  
CC  
J1 or J2 and jumper the appropriate power input (see platform users  
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.  
2-3  
Operation  
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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 31 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  
potentiometeruntil25kismeasuredacrosstheleads. Applytheexternal  
source to the VOLUME pin.  
Figure 22. Module Preparation  
12  
- Power Up  
13) Verify correct voltage and input polarity and set the external power supply  
to ON. If V and an on-board regulator EVM are used to provide V , set  
CC  
DD  
platform power switch S1 to ON.  
Platform LED2 should light indicating the presence of V , and the evaluation  
DD  
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 23.  
2-4  
Operation  
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Quick Start List for Stand-Alone  
Figure 23. Quick Start for Stand-Alone  
6
7
Right  
5
4
Audio  
Input  
(Right)  
External Shut  
Down Control  
(active low)  
8
4
Audio  
Input  
(Left)  
Left  
5
5 V  
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 31 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  
potentiometeruntil25kismeasuredacrosstheleads. Applytheexternal  
source to the VOLUME pin.  
- 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.  
2-5  
Operation  
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Quick Start List for Stand-Alone  
The EVM should begin operation.  
10) Adjust the signal source level and potentiometer R3 as needed.  
2-6  
Operation  
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Power Requirements  
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 V  
supply from a wide variety of  
DD  
unregulated V voltage inputs between 5.5 V and 12 V, including an onboard  
CC  
9-V battery. Alternatively, an external regulated power source can be used to  
supply V  
voltage to the platform and the TPA2008D2 evaluation module  
DD  
installed on it.  
AlthoughtheTPA2008D2amplifierICdrawsapproximately1Afromthepower  
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.  
- V  
DD  
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  
shouldV voltageoftheincorrectpolarityorinexcessof6.1Vbeapplied  
DD  
to screw terminals J6 of the platform, or the power protection circuit on the  
V
line will trip.  
DD  
- V  
voltage applied to the platform MUST NOT exceed the maximum  
CC  
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 V  
voltage applied to the platform exceed  
CC  
15 V, or the overvoltage protection circuit on the V  
bus will trip.  
CC  
2-7  
Operation  
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2-8  
Operation  
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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32  
3.2 TPA2008D2 EVM PCB Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33  
3.3 TPA2008D2 EVM Parts LIst . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34  
3.4 DC Volume Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35  
3-1  
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TPA2008D2 EVM Schematic  
3.1 TPA2008D2 EVM Schematic  
Figure 31. TPA2008D2 Filter-Free Class-D EVM Schematic Diagram  
U1  
TPA2008D2  
C3  
C2  
1
2
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
LINN  
RINN  
RINP  
RIN–  
LIN–  
LIN+  
C4  
C1  
0.1 µF  
0.1 µF  
LINP  
RIN+  
0.1 µF  
0.1 µF  
3
SHUTDOWN  
PVDD  
BYPASS  
PVDD  
SHUTDOWN  
SHUTDOWN  
4
C5  
1 µF  
R1  
120 kΩ  
S1  
5
LOUTP  
PGND  
ROUT+  
GND  
ROUTP  
6
VDD  
PGND  
PGND  
LOUT+  
GND  
C9  
1 µF  
7
PGND  
8
C7  
1 µF  
C11  
ROUTN  
PVDD  
ROUT–  
LOUTN  
PVDD  
COSC  
ROSC  
10 µF  
9
VDD  
LOUT–  
10  
11  
NC  
VOLUME  
VOLUME  
VDD  
C6  
220 pF  
CW  
CCW  
R2  
120 kΩ  
12  
13  
R3 50 kΩ  
AGND  
VDD  
C10  
C8  
1 µF  
1 µF  
GND  
3-2  
Reference  
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TPA2008D2 EVM PCB Layers  
3.2 TPA2008D2 EVM PCB Layers  
Figure 32 and Figure 33 depict the TPA2008D2 EVM PCB layers. These  
drawings are not to scale. Gerber plots can be obtained from any TI sales  
office.  
Figure 32. TPA2008D2 EVM Top Assembly  
Figure 33. TPA2008D2 EVM Bottom Assembly  
3-3  
Reference  
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TPA2008D2 EVM Parts List  
3.3 TPA2008D2 EVM Parts List  
Table 31.TPA2008D2 EVM Parts List  
EVM  
Qty.  
Manufacturer/  
Part Number  
Vendor/  
Part Number  
Reference  
Description  
Size  
C1, C2, C3, Capacitor, 0.1 µF, ±5%,  
C4 X7R, 16 V  
603  
4
5
1
1
2
1
1
7
Panasonic  
ECJ1VB1C104K  
Digi-Key  
PCC1762CTND  
C5, C7, C8, Capacitor, 1 µF,  
603  
603  
Panasonic  
ECJ1VF1A105Z  
Digi-Key  
PCC1787CTND  
C9, C10  
80%/20%, Y5V, 10 V  
C6  
Capacitor, 220 pF, ±5%,  
X7R, 16 V  
Yageo America  
06032R221K9B20D  
Digi-Key  
31110771ND  
C11  
R1, R2  
R3  
Capacitor, 10 µF,  
1210  
603  
Murata  
GRM32NF51C106ZA01L  
80%/20%, Y5V, 16 V  
Resistor, 120 k, 1/16  
W, 5%  
Panasonic  
ERJ3GEYJ124V  
Digi-Key  
P120K6CTND  
Potentiometer, 50 k,  
Cermet ST SL, thru hole  
Bourns  
3362P1503  
Digi-Key  
3362P1503ND  
S1  
Switch, momentary  
SMD  
Panasonic  
EVQPPBA25  
Digi-Key  
P8086SCTND  
pushbutton, 12 V, 50 mA  
Headers, 0.1 in centers,  
1/2 in long  
0.5 X  
0.25 X  
0.1”  
Samtec  
TSW198GS  
U1  
IC, 2-W, stereo class-D  
audio power amplifer  
24-pin  
TSSOP  
1
1
TI  
TPA2008D2PWP  
PCB  
PCB, 2 layer, fits U2 on  
PnP  
2.25 X  
1.25”  
TI  
SLOP392  
3-4  
Reference  
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DC Volume Table  
3.4 DC Volume Table  
Table 32.DC Volume Control  
Voltage on VOLUME Pin (V) Voltage on VOLUME Pin (V)  
Gain of Amplifier  
(dB)  
(Increasing or Fixed Gain)  
(Decreasing Gain)  
00.34  
0.310  
38  
37  
35  
33  
31  
29  
27  
25  
23  
21  
19  
17  
15  
13  
12  
10  
8  
0.340.42  
0.430.52  
0.530.63  
0.640.75  
0.760.86  
0.870.97  
0.981.07  
1.081.18  
1.191.3  
0.430.32  
0.540.44  
0.640.55  
0.750.65  
0.860.76  
0.970.87  
1.080.98  
1.191.09  
1.321.2  
1.311.41  
1.421.52  
1.531.63  
1.641.75  
1.761.85  
1.861.96  
1.972.07  
2.082.18  
2.192.3  
1.421.33  
1.531.43  
1.631.54  
1.751.64  
1.841.76  
1.961.85  
2.091.97  
2.192.1  
6  
2.332.2  
4  
2.312.4  
2.432.34  
2.492.44  
2.622.5  
2  
2.412.52  
2.532.63  
2.642.75  
2.762.87  
2.882.98  
2.993.1  
0
2
2.752.63  
2.852.76  
2.992.86  
3.123  
4
6
8
10  
3.113.22  
3.233.33  
3.343.47  
3.483.69  
3.253.13  
3.363.26  
3.483.37  
3.643.49  
12  
14  
16  
18  
3.70V  
V
3.65  
DD  
20  
DD  
Note: See the TPA2008D2 data sheet, literature number SLOS413 for more information.  
3-5  
Reference  
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3-6  
Reference  
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