User’s Guide
May 2001
Mixed-Signal Products
SLOU022A
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Preface
How to Use This Manual
This document contains the following chapters:
Chapter 1—Introduction
Chapter 2—Quick Start
Chapter 3—Details
Related Documentation From Texas Instruments
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.
TPA102 150-mW Stereo Audio Power Amplifier (literature number
SLOS213)This is the data sheet for the TPA102 audio amplifier integrated
circuit.
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 Title—Attribute Reference
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
3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1
1.2
1.3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
TPA102 MSOP EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1
2.2
2.3
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1
3.2
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
The TPA102 MSOP Audio Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.2.1 TPA102 Audio Amplifier IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.2.2 Module Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.2.3 Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Using the TPA102 MSOP EVM With the Plug-N-Play Evaluation Platform . . . . . . . . . . 3-6
3.3.1 Installing and Removing EVM Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.3.2 Signal Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.3.3 Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.3.4 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3.3.5 Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Using the TPA102 MSOP EVM Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
3.4.1 TPA102 MSOP EVM Connected as a Stereo Headphone Amplifier . . . . . . . 3-11
TPA102 MSOP Audio Power Amplifier Evaluation Module Parts List . . . . . . . . . . . . . . 3-12
3.3
3.4
3.5
v
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Figures
1–1
2–1
2–2
3–1
3–2
3–3
3–4
3–5
3–6
3–7
3–8
The TI TPA102 MSOP Audio Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Quick Start Module Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
The TI Plug-N-Play Audio Amplifier Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
TPA102 MSOP EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
TPA102 MSOP EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
TPA102 Audio Amplifier IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Platform Signal Routing and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Mute Polarity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Typical Headphone Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
TPA102 MSOP EVM Connected as a Stereo Headphone Amplifier . . . . . . . . . . . . . . . . . 3-11
Tables
2–1
Typical TI Plug-N-Play Platform Jumper and Switch Settings for the
TPA102 MSOP EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Platform Jumper and Switch Settings for the TPA102 MSOP EVM . . . . . . . . . . . . . . . . . . . 2-3
TPA102 MSOP EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
2–2
3–1
vi
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Chapter 1
Introduction
This chapter provides an overview of the Texas Instruments (TI) TPA102
MSOP audio amplifier evaluation module (SLOP125). It includes a list of EVM
features, a brief illustrated description of the module, and a list of EVM
specifications.
Topic
Page
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
1.3 TPA102 MSOP EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
1-1
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Features
1.1 Features
The TI TPA102 MSOP audio amplifier evaluation module and the TI
plug-n-play audio amplifier evaluation platform include the following features:
TPA102 MSOP stereo audio power amplifier evaluation module
Dual channel, single-ended operation
150 mW output power into 8 Ω at 5 V
2.5-V to 5.5-V operation
Verylowdistortion—THD+Nislessthan0.01%at1kHzandlessthan
0.03%from20Hzto20kHzinto10-kΩ loads, lessthan0.02%at1kHz
andlessthan0.4%from20Hzto20kHzinto32-Ω loads, andlessthan
0.05%at1kHzandlessthan0.8%from20Hzto20kHzinto8-Ω loads
Extremely low current consumption in shutdown mode
Internal thermal and short-circuit protection
Internal pop reduction circuitry
Quick and easy configuration with the TI plug-n-play audio amplifier
evaluation platform
Evaluation module is designed to simply plug into the platform,
automatically making all signal, control, and power connections
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
Onboard 9-V battery
External 5-V – 15-V (V ) supply inputs
CC
External regulated V
supply input
DD
Socket for onboard 5-V V
voltage regulator EVM
DD
Onboard overvoltage and reverse polarity power protection
Platform audio input and output connections
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 TPA102 MSOP audio power amplifier evaluation module is a complete,
low-power stereo audio power amplifier for high-fidelity line-level output,
headphone, and small speaker applications. It consists of the TI TPA102
150-mWstereoaudiopoweramplifierICinaverysmallMSOPpackage, along
with a small number of other parts mounted on a circuit board that is
approximately one and a quarter inches square (Figure 1–1).
Figure 1–1. The TI TPA102 MSOP Audio Amplifier Evaluation Module
VDD GND
Shutdown
S1
C3
C4
R2
C7
IN1
R1
GND
Vo1
R3
C1
GND
†
U1
C5
C2
R4
R5
TEXAS
INSTRUMENTS
GND
Vo2
IN2
SLOP125
GND
TPA102 MSOP EVM
†
Due to the very small size of the MSOP IC package, the standard part number TPA102 is
replaced with the code TIAAC
Single in-line header pins are mounted to 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.
The platform has room for a single TPA102 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,
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 TPA102 MSOP EVM Specifications
Supply voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 V to 5.5 V
DD
Supply current, I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 mA, max
DD
Continuous output power, P : 8 Ω, V =5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 mW
O
DD
Audio input voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
+ 0.3 Vpp, max
I
DD
Minimum load impedance, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ω
L
1-3
Introduction
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1-4
Introduction
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Chapter 2
Quick Start
ThestepsinthischaptercanbefollowedtoquicklypreparetheTPA102MSOP
audio amplifier EVM for use. Using the TPA102 MSOP EVM 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
TPA102 MSOP EVM and will cause the TPA102 IC to shutdown/mute when
a plug is removed from platform headphone jack J10.
Table 2–1. Typical TI Plug-N-Play Platform Jumper and Switch Settings for the
TPA102 MSOP EVM
EVM
JP6
JP7
JP8
S2
S3
TPA102
X
Lo
X
Note 2
U5
Notes: 1) 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
2-1
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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 applied—damage
to the EVM board, the platform, or both may result.
Figure 2–1. Quick Start Platform Map
6b
6b
6b
1
10
F1
ICC
JP4
C1+
VR1
6a
DC
6b
Power
In/Out
Power
Input
R2
R1
Audio
Power
Amps
Signal Conditioning
8
Audio
Input
Speaker
Output
Mode
Mute
Polarity
****CAUTION****
Lo
Hi
Do not insert or remove
EVM boards with power
applied
Stereo
Headphone
Output
Plug-N-Play Audio Amplifier
Evaluation Platform
SLOP097 Rev. C.1
9
HP Out
R3
R4
R5
3
2
5
4
2-2
Quick Start
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Quick Start List for Platform
2.2 Quick Start List for Platform
Follow these steps when using the TPA102 MSOP EVM with the TI
Plug-N-Playaudioamplifierevaluationplatform(seetheplatformuser’sguide,
SLOU011, for additional details). Numbered callouts for selected steps are
shown in Figure 2–1 and details appear in Chapter 3.
Platform preparations
1) EnsurethatallexternalpowersourcesaresettoOFF andthattheplatform
power switch S1 is set to OFF.
2) Install a TPA102 MSOP module in platform socket U5, 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 JP7 to Lo.
5) Set Hp source switch S3 to U5 to route the output signal to the headphone
Jack (J10).
Table 2–2. Platform Jumper and Switch Settings for the TPA102 MSOP EVM
EVM
JP6
JP7
JP8
S2
S3
TPA102
X
Lo
X
Note 2
U5
Notes: 1) 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
6) Select and connect the power supply:
a) Connect an external regulated power supply set to a voltage between
2.5 V and 5.5 V to platform V power input connector J6, taking care
DD
to observe marked polarity,
or
b) Install a 3-V to 5-V voltage regulator EVM (SLVP097 or equiv.) in
platform socket U6. Install a 9-V battery in B1 or connect a 7 V–12 V
power source to a platform V
appropriate power input (see platform user’s guide).
power input J1 or J2 and jumper the
CC
Inputs and outputs
7) Ensure that signal source level is set to minimum.
8) Connect the audio source to left and right RCA phono jacks J3 and J5 or
stereo miniature phone jack J4.
9) Connect 32-Ω headphones to headphone jack J10.
Power-up
10) 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.
11) Adjust the signal source level as needed.
2-3
Quick Start
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Quick Start List for Stand-Alone
2.3 Quick Start List for Stand-Alone
Follow these steps to use the TPA102 MSOP EVM stand-alone or when
connecting it into existing circuits or equipment. Connections to the TPA102
MSOP 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 2–2 and details appear in Chapter 3.
Figure 2–2. Quick Start Module Map
2
VDD GND
Shutdown
S1
C3
C4
5
4
R2
C7
IN1
R1
GND
Vo1
R3
6
6
C1
GND
†
U1
C5
C2
R4
R5
TEXAS
INSTRUMENTS
GND
Vo2
IN2
SLOP125
TPA102 MSOP EVM
4
GND
†
Due to the very small size of the MSOP IC package, the standard part number TPA102 is
replaced with the code TIAAC
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 the signal source level is set to minimum.
4) Connect the audio source to the module IN1, IN2, and GND pins taking
care to observe marked polarity.
5) Connect the Shutdown pin to V
through a normally open switch.
DD
6) Connect 32-Ω headphones to the module V 1, V 2 pins through 33 µF
O
O
to 1000 µF output-coupling capacitors (figure 3–8) and return to the GND
pin, or
7) For line output, connections to the V 1 and V 2 pins must be made
O
O
through 33 µF to 1000 µF output-coupling capacitors and returned to
GND.
Power-up
8) Verify correct voltage and input polarity and set the external power supply
to ON.
The EVM should begin operation.
9) Adjust the signal source level as needed.
2-4
Quick Start
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Chapter 3
Details
This chapter provides details on the TPA102 IC, the evaluation module, the
steps in the Quick-Start List, additional application information, and a parts list
for the TPA102 MSOP evaluation module.
Topic
Page
3.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
3.2 The TPA102 MSOP Audio Power Amplifier Evaluation Module . . . . 3–3
3.3 Using The TPA102 MSOP EVM With the Plug-N-Play
Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6
3.4 Using the TPA102 MSOP EVM Stand-Alone . . . . . . . . . . . . . . . . . . . . . 3–11
3.5 TPA102 MSOP Audio Power Amplifier EVM Parts List . . . . . . . . . . 3–12
3-1
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Precautions
3.1 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 applied—damage
to the EVM board, the platform, or both may result.
Figure 3–1. The TI Plug-N-Play Audio Amplifier Evaluation Platform
ICC
JP4
C1+
F1
VR1
DC
Power
In/Out
Power
Input
R2
R1
Audio
Power
Amps
Signal Conditioning
Audio
Input
Speaker
Output
Mode
Mute
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
HP Out
R3
R4
R5
3-2
Details
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The TPA102 MSOP Audio Power Amplifier Evaluation Module
3.2 The TPA102 MSOP Audio Power Amplifier Evaluation Module
The TPA102 MSOP audio power amplifier evaluation module is powered by
a TPA102 150-mW stereo audio amplifier IC. It includes a shutdown control
signal input with onboard switch and can drive either line-level outputs, 32-Ω
headphones, or 8-Ω speakers.
The evaluation module can be used with the TI plug-n-play audio amplifier
evaluation platform (Figure 3–1) or wired directly into circuits or equipment.
The module has single in-line header connector pins mounted to the under
side of the board. These pins allow the module to be plugged into the TI
platform, whichautomaticallymakesallthesignalinputandoutput, power, and
control connections to the module.
The module connection pins are on 0.1-inch centers to allow easy use with
standard perf board and plug board-based prototyping systems. Or, the EVM
can be wired directly into existing circuits and equipment when used
stand-alone.
The module appears in Figure 3–2 and its schematic is shown in Figure 3–3.
Figure 3–2. TPA102 MSOP EVM
VDD GND
C4
Shutdown
S1
C3
R2
C7
IN1
R1
GND
Vo1
R3
C1
GND
†
U1
C5
C2
R4
R5
TEXAS
INSTRUMENTS
GND
Vo2
IN2
SLOP125
GND
TPA102 MSOP EVM
†
Due to the very small size of the MSOP IC package, the standard part number TPA102 is re-
placed with the code TIAAC
Figure 3–3. TPA102 MSOP EVM Schematic Diagram
Audio Input 1
R2
C3
1 µF
8
7
1
20 kΩ
Bypass
GND
IN 1
Vo1
C1
R3
80 kΩ
1 µF
S1
Vo1
2
3
TPA102
MSOP
V
DD
V
DD
NO
Shutdown
(V to
Shutdown)
2.5 to 5.5 V
6
5
C4
10 µF
+
C5
1 µF
Shutdown
IN 2
V
DD
DD
R1
20 kΩ
GND
Vo2
4
C2
1 µF
R5
Vo2
20 kΩ
Audio Input 2
R4, 80 kΩ
3-3
Details
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The TPA102 MSOP Audio Power Amplifier Evaluation Module
3.2.1 TPA102 Audio Amplifier IC
The TPA102 audio amplifier IC is a CMOS device intended primarily for
high-performance line-level output, headphone driver, and small speaker
applications. It is supplied in a very small surface-mount MSOP package
designed to operate from low supply voltages (between approximately 2.5 V
and 5.5 V) and deliver up to approximately 150 mW into 8-Ω speakers with low
distortion. As a line-level driver, distortion levels (THD+N) are below 0.03%
into 10-kΩ loads across the audio band (20 Hz to 20 kHz). As a headphone
driver, distortion levels are below 0.4% into 32-Ω loads across the audio band.
And as a speaker driver, distortion levels are below 0.8% into 8-Ω loads across
the audio band. Typical applications include portable computers, desktop
computers, personal audio, toys, games, and similar audio applications.
The IC includes two separate internal amplifiers, depop circuitry, and a
common shutdown control (Figure 3–4). The load for each channel is
connected between the V pin and GND through a coupling capacitor. For
O
moreinformation, see theTPA102 amplifierICdata sheet, TI literature number
SLOS213.
Figure 3–4. TPA102 Amplifier IC
6
V
DD
R
F
C
Stereo Audio
Input
S
R
I
C
IN1
8
1
C
V
O
1
R
–
7
2
Bypass
C
+
I
C
B
R
R
L
From System
Control
Shutdown
IN2
Bias
Control
3
4
L
Stereo
R
I
C
C
–
V 2
O
L
5
C
I
+
R
F
3-4
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The TPA102 MSOP Audio Power Amplifier Evaluation Module
3.2.2 Module Gain
The TPA102 MSOP evaluation module has a set gain of 4 (inverting) for each
channel. However, the gain can be adjusted to a maximum of approximately
10 (inverting) by changing the value of feedback resistors (R2 and R4, Figure
3–3). Use the following equation to determine the value of R
F:
RF
RI
Gain
–
The TPA102 amplifier IC, like most other amplifiers, exhibits its best distortion
and noise performance at lower gain levels. In addition, higher gain levels
require a small compensation capacitor to ensure stability (see the TPA102
amplifier IC data sheet, TI literature number SLOS213).
Gain versus total harmonic distortion (THD) and gain versus signal-to-noise
ratio (SNR) should be considered in each application. Both the module input
signal level and the TPA102 MSOP module gain should be adjusted to obtain
the lowest overall distortion level for a particular overall gain. A quick rule of
thumb (everything else being equal): the module input signal level should be
as high as possible without clipping or overloading the TPA102 input, and the
TPA102 gain should be kept as low as possible.
3.2.3 Shutdown
When the shutdown terminal of the TPA102 amplifier IC is taken high, the IC
ceases operation and enters a very low power state (65 µA, Typ). This is
accomplished by applying a control signal to the module SD pin or by pressing
the Shutdown switch, S1, on the module. When the control signal goes low or
is removed (or the switch is released), amplifier operation resumes.
The plug-n-play platform can generate the mute signal for the module either
when a plug is inserted into the platform headphone output jack or when the
plug is removed, as selected by a platform jumper (JP7).
3-5
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Using the TPA102 MSOP EVM With the Plug-N-Play Evaluation Platform
3.3 Using the TPA102 MSOP EVM With the Plug-N-Play Evaluation Platform
The TPA102 MSOP audio amplifier evaluation module is designed for use with
the TI plug-n-play audio amplifier evaluation platform. It simply plugs into
socket U5.
The following paragraphs provide additional details for using the TPA102EVM
with the platform.
3.3.1 Installing and Removing EVM Boards
TI plug-n-play evaluation modules use single-in-line header pins installed on
the underside of the module circuit board to plug into sockets on the platform.
The EVM pins and the platform sockets are keyed such that only the correct
type of EVM can be installed in a particular socket, and then only with the
proper orientation.
Evaluation modules are easily removed from the platform by simply prying
them up and lifting them out of their sockets. Care must be taken, however, to
prevent bending the pins.
3.3.1.1 EVM Insertion
1) Remove all power from the evaluation platform.
2) Locate socket U5 on the platform.
3) Orient the module correctly.
4) Carefully align the pins of the module with the socket pin receptacles.
5) Gently press the module into place.
6) Check to be sure that all pins are seated properly and that none are bent
over.
3.3.1.2 EVM Removal
1) Remove all power from the evaluation platform.
2) Gently pry up one side of the module a short distance.
3) Change to the opposite side of the module and pry that side up a short dis-
tance.
4) Alternate between sides, prying the module up a little more each time to
avoid bending the pins, until it comes loose from the socket.
5) Lift the EVM off the platform.
3-6
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Using the TPA102 MSOP EVM With the Plug-N-Play Evaluation Platform
3.3.2 Signal Routing
Signal flow on the platform is controlled by two signal routing switches, as
shown in Figure 3–5.
Figure 3–5. Platform Signal Routing and Outputs
U2 Stereo Power
Amplifier EVM
Off
U3
+
Mono Power
Amplifier EVM
R
R
L
R
–
J7, J8, J9
Speaker
Outputs
U1
Signal
Conditioning
Audio
Input
S2
U4
–
L
Mono Power
Amplifier EVM
+
L
On
U2–U4
R
+
R
U5
TPA102 MSOP
Headphone
Amplifier EVM
–
J10
Headphone
Output
GND
S3
L
–
+
L
U5
3.3.2.1 Signal Conditioning
The audio signal from the input jacks can be applied to the signal conditioning
socket (U1) if an EVM is installed there, or socket U1 can be bypassed and the
audioinputsignalapplieddirectlytotheinputsoftheTPA102poweramplifiers.
Switch S2 selects or bypasses signal conditioning.
3.3.2.2 Headphone Output Jack
Switch S3 is the source select for the stereo headphone output jack, J10. The
headphone jack is capacitively coupled (via 470 µF electrolytics. It can output
either the signal from the the TPA102 MSOP headphone amplifier in socket
U5, or the signal from power amplifiers installed in socket U2 or in sockets U3
and U4, as determined by the setting of headphone source select switch S3.
When S3 is set to the headphone amplifier position (U5), the headphone jack
is connected to the headphone amplifier EVM output lines. When a plug is
inserted into the jack, signals output through J10 are returned to platform
ground. A switch inside the headphone jack produces a control signal that can
be routed to the headphone amplifier socket to shutdown the TPA102 MSOP
EVM when the headphone plug is removed.
Switch S3 connects the headphone jack to either the headphone amplifier
platform socket (U5) or to the platform power amplifier sockets (U2 – U4).
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Using the TPA102 MSOP EVM With the Plug-N-Play Evaluation Platform
3.3.3 Shutdown
The TPA102 MSOP EVM is equipped with a shutdown control input pin. When
this input is tied to V , the TPA102 amplifier IC on the module ceases
DD
operation and enters an ultralow-power state. When the EVM shutdown
control input is tied to GND or allowed to float, amplifier operation resumes.
In typical applications, as often found in notebook computers, portable audio
products, and such, the internal speakers mute when headphones are
plugged into the headphone jack, or internal speakers mute when external
speakers are connected. In applications using separate speaker and
headphone amplifiers, the one not being used can be muted to conserve
power.
3.3.3.1 Headphone Jack Control Signals
The platform headphone output jack (J10) contains an internal switch that
changes the state of a pair of control lines when a plug is inserted or removed
(Figure 3–6). Each control line is pulled down by a 1-kΩ resistor to ground (R4
and R5). The switch in the headphone jack pulls one line or the other up to V
DD
through a 240-Ω resistor (R3), depending on whether or not a plug is inserted
in J10.
Figure 3–6. Shutdown Polarity Control
V
DD
R3
240 Ω
Polarity
JP7
Lo
U5
J10
Headphone
Jack
Shutdown
Headphone
Amplifier
Hi
R4
R5
HP
1 kΩ
1 kΩ
(U5)
3.3.3.2 Shutdown Polarity Select (JP7)
A 3-pin jumper header (JP7) on the platform selects the shutdown control
signal polarity by connecting either the active-high or the active-low line from
the headphone jack to platform socket U5. The TPA102 MSOP EVM shuts
down when V
is applied to the module SD pin.
DD
To shutdown the TPA102 MSOP amplifier module when a plug is
inserted into the headphone jack, jumper JP7 to Hi.
To shutdown the TPA102 MSOP amplifier module until a plug is
inserted into the headphone jack, jumper JP7 to Lo (this is the typical
setting).
3-8
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Using the TPA102 MSOP EVM With the Plug-N-Play Evaluation Platform
3.3.4 Power Requirements
The TPA102 MSOP audio power amplifier evaluation module can operate
from a V voltage between approximately 2.5 V and 5.5 V.
DD
The TI plug-n-play audio amplifier evaluation platform with a voltage regulator
EVM installed on it can provide a regulated 3.3-V or 5-V V supply from a
DD
wide variety of unregulated V
voltage inputs between approximately 5.5 V
CC
and 12 V, including an onboard 9-V battery. Or, an external regulated power
source can be used to supply V voltage to the platform and the TPA102
DD
evaluation module installed on it.
The platform is equipped with overvoltage and reverse-polarity supply voltage
input protection in the form of fused crowbar circuits.
V
voltage applied to platform screw terminals J6 must not exceed the
DD
absolute maximum rating for the TPA102 amplifier IC installed on the eval-
uation module (5.5 V), or damage to the IC may result. In no case should
V
voltage of the incorrect polarity or in excess of 6.1 V be applied to
DD
screw terminals J6 of the platform, or the power protection circuit on the
V
line will trip.
DD
V
voltageappliedtotheplatformmustnotexceedthemaximumvoltage
CC
input specified for the voltage regulator module installed in socket U6 (12
VfortheSLVP097), ordamagetothevoltageregulatormodulemayresult.
In no case should V
voltage applied to the platform exceed 15 V, or the
CC
overvoltage protection circuit on the V
bus will trip.
CC
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Using the TPA102 MSOP EVM With the Plug-N-Play Evaluation Platform
3.3.5 Inputs and Outputs
The TI plug-n-play audio amplifier evaluation platform is equipped with several
standard conectors for audio inputs and outputs.
3.3.5.1 Inputs
In most cases, audio signals enter the platform through either a pair of RCA
phono jacks (J3 and J5) or a miniature (1/8″) stereo phone jack (J4). Certain
signal conditioning and amplifier EVMs, however, may have additional signal
input connectors mounted on the module circuit board.
The platform audio signal input jacks (J3, J4, and J5) are of the closed-circuit
type, grounding the signal input lines when no plugs are inserted.
3.3.5.2 Outputs
Output signals from the headphone amplifier (U5) leave the platform through
a miniature (1/8″) stereo headphone jack (J10). Amplified audio output signals
from the power amplifiers (U2 – U4) leave the platform through left and right
RCA phono jacks (J7 and J9), left and right pairs of compression connectors
for stripped speaker wires (J8), and optionally, through the headphone jack.
The audio output lines from the power amplifiers are separate all the way to
the edge of the platform (output jacks J7, J8, and J9) — the OUT– lines from
the power amplifier sockets are not tied to each other or to platform ground.
This allows the power amplifier EVMs to operate in the highly-efficient
bridge-tied load configuration.
The headphone jack (J10) is capacitively coupled to source select switch S3,
which connects J10 to the output lines of either the headphone amplifier
socket or the power amplifier sockets (Figure 3–5). When the TPA102 MSOP
EVM output signal is routed to J10 by S3, signals output via J10 are returned
to platform ground when a plug is inserted (Figure 3–7).
Figure 3–7. Typical Headphone Plug
Left
Right
GND
3-10
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Using the TPA102 MSOP EVM Stand-Alone
3.4 Using the TPA102 MSOP EVM Stand-Alone
Using the TPA102 MSOP audio power amplifier evaluation module
stand-alone is much the same as using it with the platform. The same 2.5-V
to 5.5-V power supply requirement exists.
Note that the shutdown signal applied to the EVM SD pin must be able to
supply enough current to overcome the pulldown resistor on the module
(20 kΩ).
3.4.1 TPA102 MSOP EVM Connected as a Stereo Headphone Amplifier
Figure 3–8. TPA102 MSOP EVM Connected as a Stereo Headphone Amplifier
5 VDC
VDD GND
C4
Shutdown
Shutdown
NO
S1
C3
Audio
Input
R2
C7
IN1
R1
(Right)
GND
Vo1
R3
C1
+
+
GND
33 µF –
†
U1
C5
1000 µF
C2
R4
R5
TEXAS
33 µF –
1000 µF
Audio
Input
(Left)
INSTRUMENTS
GND
Vo2
IN2
SLOP125
GND
TPA102 MSOP EVM
†
Due to the very small size of the MSOP IC package, the standard part number TPA102 is replaced with the code TIAAC
3-11
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TPA102 MSOP Audio Power Amplifier Evaluation Module Parts List
3.5 TPA102 MSOP Audio Power Amplifier Evaluation Module Parts List
Table 3–1. TPA102 MSOP EVM Parts List
EVM
Qty.
Manufacturer/
Part Number
Ref.
Description
Size
Vendor/Number
Newark
C1, C2,
C3, C5
Capacitor, 1 µF,
80%/–20%,
0603
4
Murata
GRM39-Y5V105Z10PT
Non-polarized, SMD
C4
Capacitor, 10 µF, 6.3 V,
A
1
3
2
1
1
Panasonic
ECS-TOJY106R
Digi-Key
PCS1106CT-ND
SMD
R1, R2,
R5
Resistor, 20 kΩ, 1/16 W,
5%, SMD
0603
Panasonic
ERJ-3GSYJ203
Digi-Key
R3, R4
Resistor, 80 kΩ, 1/16 W,
5%, SMD
0603
Panasonic
ERJ-3GSYJ803
Digi-Key
S1
Switch, momentary
SMD
Panasonic
P8048SCT-ND
Digi-Key
P8048SCT-ND
U1
IC, TPA102, audio
amplifier, 150 mW, 2
channel, SMD
MSOP-8
TI
†
TPA102DGN
Terminal post headers
11
1
Sullins
Digi-Key
S1022-36-ND
PCB1
PCB, TPA102 MSOP EVM
†
Due to the very small size of the MSOP IC package, the standard part number TPA102 is replaced with the code TIAAC
3-12
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