TPA311 MSOP
Audio Power Amplifier
Evaluation Module
User’s Guide
2001 Mixed-Signal Products
SLOU020A
IMPORTANT NOTICE
T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
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pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its products to the specifications applicable at the time of sale in accordance with
TI’s standard warranty . T esting and other quality control techniques are utilized to the extent TI deems necessary
to support this warranty . Specific testing of all parameters of each device is not necessarily performed, except
those mandated by government requirements.
Customers are responsible for their applications using TI components.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
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Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2001, Texas Instruments Incorporated
www.ti.com/sc/docs/stdterms.htm
stated by TI for
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
TPA311 350-mW Low-Voltage Audio Power Amplifier (literature
number SLOS207) This is the data sheet for the TPA311 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.
Preface
Trademarks
TI is a trademark of Texas Instruments Incorporated.
Chapter Title—Attribute Reference
iii
iv
Running Title—Attribute Reference
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Feature Highlights 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Description 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 TPA311 MSOP EVM Specifications 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Quick Start 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Precautions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Quick Start List for Platform 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Quick Start List for Stand-Alone 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Details 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Precautions 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 The TPA311 MSOP Audio Amplifier Evaluation Module 3-3. . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.1 TPA311 Audio Amplifier IC 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.2 BTL Operation 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.3 Single-Ended Operation 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.4 Module Gain 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.5 Shutdown 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Using The TPA311 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 Mute/Mode 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.4 Power Requirements 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.5 Inputs and Outputs 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Using The TPA311 MSOP EVM Stand-ALone 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.1 TPA311 MSOP EVM Connected for BTL Output 3-12. . . . . . . . . . . . . . . . . . . . . . . .
3.4.2 TPA311 MSOP EVM Connected for Single-Ended Output 3-13. . . . . . . . . . . . . . . .
3.5 TPA311 MSOP Audio Amplifier Evaluation Module Parts List 3-14. . . . . . . . . . . . . . . . . . . .
Chapter Title—Attribute Reference
v
Running Title—Attribute Reference
Figures
1–1 The TI TPA311 MSOP Audio Amplifier Evaluation Module 1-3. . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 Quick Start Platform Map 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Quick Start Module Map 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1 The TI Plug-N-Play Audio Amplifier Evaluation Platform 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–2 TPA311 MSOP EVM 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–3 TPA311 MSOP EVM Schematic Diagram 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–4 TPA311 Audio Amplifier IC 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–5 Platform Signal Routing and Outputs 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–6 Mute/Mode and Polarity Control 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–7 Typical Headphone Plug 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–8 TPA311 MSOP EVM Connected for Stereo BTL Output 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . .
3–9 TPA311 MSOP EVM Connected for Stereo Single-Ended Output 3-13. . . . . . . . . . . . . . . . . . .
Tables
2–1 Typical TI Plug-N-Play Platform Jumper and Switch Settings for the
2–2 Platform Jumper and Switch Settings for the TPA311 MSOP EVM 2-3. . . . . . . . . . . . . . . . . . .
3–1 TPA311 MSOP EVM Parts List 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TPA311 MSOP EVM 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vi
Chapter 1
Introduction
This chapter provides an overview of the Texas Instruments (TI) TPA311
MSOP audio amplifier evaluation module (SLOP123). It includes a list of EVM
features, a brief description of the module illustrated with a pictorial diagram,
and a list of EVM specifications.
Topic Page
1.1 Feature Highlights 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Description 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 TP A311 MSOP EVM Specifications 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
1-1
Feature Highlights
1.1 Feature Highlights
The TI TPA311 MSOP audio amplifier evaluation module and the TI
plug-n-play audio amplifier evaluation platform include the following features:
-
TPA311 Low-Voltage Audio Power Amplifier Evaluation Module
J
J
J
J
J
J
-
Quick and Easy Configuration With the TI Plug-N-Play Audio Amplifier
Evaluation Platform
J
J
Single channel, bridge-tied load (BTL) or single-ended operation
3.3-V and 5-V operation
350 mW output power into 8 Ω at 5 V, BTL
Ultra-low current consumption in shutdown/mute mode
Internal thermal and short-circuit protection
Module gain adjustable between approximately 2 and 22
Evaluation module is designed to simply plug into the platform, automatically making all signal, control, and power connections
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
Onboard 9-V battery
J
External 5-V – 15-V (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
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
1-2
Introduction
1.2 Description
The TPA311 MSOP audio power amplifier evaluation module is a complete,
low-power single-channel audio power amplifier. It consists of the TI TPA31 1
350-mW low-voltage audio power amplifier IC in a very small MSOP package,
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 TPA311 Audio Amplifier Evaluation Module
Vdd GND
Shutdown
C5
S1
R1
C2
R2
R4
C1
SE\BTL*
IN+
GND
TPA311 MSOP EVM
+
†
U1
C3
R3
C4
TEXAS
INSTRUMENTS
SLOP123
OUT–
GND
OUT+
Description
†
Due to the very small size of the MSOP IC package, the standard part number TPA311 is replaced with the code TIAAB
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 pair of TP A31 1 MSOP evaluation modules 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 TPA311 EVM Specifications
Supply voltage range, V
Supply current, I
DD
DD
Continuous output power, P
Audio input voltage, V
I
Minimum load impedance, R
:8-Ω BTL, VDD=5 V: 350 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
32-Ω BTL, V
L
=5 V: 75 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DD
2.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
250 mA, max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Vpp, max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Ω. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
1-3
1-4
Introduction
Chapter 2
Quick Start
The steps in this chapter can be followed to quickly prepare the TP A311 MSOP
audio amplifier EVM for use. Using the TPA311 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 T able 2–1 are typical for the
TP A311 MSOP EVM and will cause the TPA311 IC to switch to single-ended
output mode 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 TPA311
MSOP EVM
EVM JP6 JP7 JP8 S2 S3
TPA311 Mode X Hi Note 2 X
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Quick Start
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 V
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
power input connector J1, J2, and/or VDD power
CC
Power
Input
7b
Audio
Input
9
In
+
AC/DC
In
SOURCE
DC
VCC
D4
J2
VCC(J1)
J1
D3
Right
J3
In
Stereo
J4
In
Left
J5
In
TEXAS
INSTRUMENTS
1997
7b
JP1
AC/DC
(J2)
D2
Batt
D1
VR1
F1
VCC
C1+
LED1
JP3
JP2
Signal Conditioning
****CAUTION****
Do not insert or remove
EVM boards with power
applied
Plug-N-Play Audio Amplifier
Evaluation Platform
SLOP097 Rev. C.1
R1
U1
111
Off Pwr
ConditioningS2
TP1
GND
On
ICC
JP4
S1
Audio
Power
Amps
OnOff
B1
IDD
U5
JP5
7b
U3 U4
R2
U2-U4
U5
HP
Source
SUPPLY
U2
HP(U5)
S3
R3
R4
POWER
LED2
VDD
JP6
Polarity
Lo
Hi
JP7
+
+
7b
U6
Mode
Mute
Spk(U2-U4)
JP8
C3 C2
HP Out
F2
J7
Right
Out
J8
Out
Out
J9
Left
Out
Stereo
+ – + –
Right
Left
VR2
In/Out
VDD
J10
R5
DC
Power
In/Out
+
J6
Speaker
Output
Headphone
Output
7a
10
5
2-2
3
2
6
4
Quick Start
Quick Start List for Platform
2.2 Quick Start List for Platform
Follow these steps when using the TP A311 MSOP EVM with the TI plug-n-play
audio amplifier evaluation platform (see the platform user’s guide, SLOU011,
for additional details). Numbered callouts for selected steps are shown in
Figure 2–1 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 TP A311 MSOP module in platform sockets U3 and U4 for stereo
operation (or a module in either U3 or U4 for single channel operation),
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 Hi.
5) Set jumper JP6 to select the Mode control input (causes the TPA311 to
switch to the single-ended output mode if a plug is inserted into platform
headphone jack J10).
6) If the headphone Jack (J10) output will be used, set Hp source switch S3
to U2–U4.
Table 2–2. Platform Jumper and Switch Settings for the TPA311 MSOP EVM
EVM JP6 JP7 JP8 S2 S3
TPA311 Mode X Hi Note 2 X
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
7) 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 voltage regulator EVM (SL VP097 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
power input J1 or J2 and jumper the appropriate
CC
power input (see platform user’s guide).
-
Inputs and outputs
8) Ensure that 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 8-Ω – 32-Ω speakers to left and right RCA jacks J7 and J9 or to
stripped wire connectors J8.
-
Power-up
1 1) 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 VDD, set
CC
platform power switch S1 to ON.
Platform LED2 should light indicating the presence of V
DD
modules installed on the platform should begin operation.
12) Adjust the signal source level as needed.
Quick Start
, and the evaluation
2-3
Quick Start List for Stand-Alone
2.3 Quick Start List for Stand-Alone
Follow these steps to use the TPA311 MSOP EVM stand-alone or when
connecting it into existing circuits or equipment. Connections to the TPA311
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
Shutdown
5
4
S1
R1
C2
R2
R4
C1
SE\BTL*
IN+
GND
TPA311 MSOP EVM
2
Vdd GND
+
†
U1
C3
R3
C4
TEXAS
INSTRUMENTS
SLOP123
C5
OUT–
GND
OUT+
7
6
†
Due to the very small size of the MSOP IC package, the standard part number TPA311 is replaced with the code TIAAB
-
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 IN+ and GND pins taking care to
observe marked polarity.
5) Connect the Shutdown pin to V
through a normally open switch.
DD
6) For BTL output, connect an 8-Ω – 32-Ω speaker to the module OUT+ and
OUT– pins, or
7) For single-ended output, connect a headphone or an 8-Ω – 32-Ω speaker
to the module OUT+ and GND pins through a 33 µF to 1000 µF outputcoupling capacitor (figure 3–9).
-
Power-up
8) Verify correct voltage and input polarity and set the external power supply
to ON.
2-4
The EVM should begin operation.
9) Adjust the signal source level as needed.
Quick Start
Chapter 3
Details
This chapter provides details on the TPA311 IC, the evaluation module, and
the steps in the Quick-Start List, additional application information, and a parts
list for the TPA311 MSOP evaluation module.
Topic Page
3.1 Precautions 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 The TPA311 MSOP Audio Power Amplifier Evaluation Module 3–3. . . .
3.3 Using The TPA311 MSOP EVM With The Plug-N-Play
Evaluation Platform 3–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Using The TPA311 MSOP EVM Stand-Alone 3–12. . . . . . . . . . . . . . . . . . .
3.5 TPA311 MSOP Audio Power Amplifier
Evaluation Module Parts List 3–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Details
3-1
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
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
JP3
JP2
JP1
SOURCE
Power
Input
Audio
Input
In
+
AC/DC
In
VCC
D4
J2
In
In
In
J1
Right
Stereo
Left
DC
VCC(J1)
AC/DC
(J2)
D2
D3
J3
Signal Conditioning
J4
J5
Batt
D1
VR1
F1
VCC
C1+
LED1
R1
U1
power input connector J1, J2, and/or VDD power
CC
On
Off Pwr
S1
ICC
JP4
B1
JP5
IDD
Audio
Power
Amps
OnOff
ConditioningS2
U3 U4
R2
SUPPLY
VDD
U2
POWER
U6
LED2
Out
J7
Right
Out
Out
F2
J8
+ – + –
Right
Left
VR2
In/Out
VDD
J6
+
DC
Power
In/Out
Speaker
Output
3-2
TEXAS
INSTRUMENTS
1997
Plug-N-Play Audio Amplifier
Evaluation Platform
SLOP097 Rev. C.1
****CAUTION****
Do not insert or remove
EVM boards with power
applied
GND
TP1
U5
U2-U4
U5
HP
Source
HP(U5)
S3
R3
R4
JP6
Polarity
Lo
Hi
JP7
+
+
Mode
Mute
Spk(U2-U4)
Out
JP8
C3 C2
HP Out
J9
Left
Stereo
J10
R5
Headphone
Output
Details
The TPA311 MSOP Audio Power Amplifier Evaluation Module
3.2 The TPA311 MSOP Audio Power Amplifier Evaluation Module
The TPA311 MSOP audio power amplifier evaluation module is powered by
a TP A31 1 350-mW low-power audio amplifier IC, includes a shutdown control
signal input with onboard switch, and can be operated in either the BTL or
single-ended output mode.
The 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, which
automatically makes all the signal input and output, 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.TPA311 MSOP EVM
Vdd GND
Shutdown
C5
S1
R1
C2
R2
R4
C1
SE\BTL*
IN+
GND
TPA311 MSOP EVM
+
†
U1
C3
R3
C4
TEXAS
INSTRUMENTS
SLOP123
OUT–
GND
OUT+
†
Due to the very small size of the MSOP IC package, the standard part number TPA311 is replaced with the code TIAAB
Figure 3–3.TPA311 MSOP EVM Schematic Diagram
Shutdown
SE/BTL
Audio Input+
GND
R1
20 kΩ
C1
1 µF
S1
C2
1 µF
R4
20 kΩ
20 kΩ
R2
No
1
Shutdown
2
Bypass
3
SE/BTL
4
In
R3
40 kΩ
V
O–
GND
V
DD
V
O+
VDD
2.5 V to 5.5 V
8
7
6
5
C3
1 µF
C4
5 pF
C5
10 µF
+
GND
Details
OUT–
GND
OUT+
3-3
The TP A311 MSOP Audio Power Amplifier Evaluation Module
3.2.1 TPA311 Audio Amplifier IC
The TP A311 audio amplifier IC is a CMOS device intended primarily for bridgetied load (BTL) operation in battery-powered applications. It is supplied in a
very small surface-mount package and has been designed to operate from low
supply voltages (between approximately 2.5 V and 5.5 V) and deliver up to
approximately 350 mW into an 8-Ω, BTL (Figure 3–4). Typical applications in-
clude portable phones, toys, games, and similar hand-held audio applications.
Figure 3–4.TPA311 Amplifier IC
4
IN
2
Bypass
1
Shutdown
3
SE/BTL
VDD/2
Bias
Control
6
V
DD
_
+
_
+
5
VO+
8
VO–
7
GND
3.2.2 BTL Operation
The IC includes two separate internal amplifiers and can operate in either the
bridged-tied load (BTL) mode or the single-ended mode as selected by the
SE/BTL
pin. In the BTL mode, the two amplifiers operate 180° out-of-phase
with each other for increased power. The speaker load is connected directly
across V
+ and VO–, and neither line is connected to ground. BTL operation
O
provides many benefits, including quadruple the output power of single-ended
operation and no need for bulky output coupling capacitors. In the singleended mode, one internal amplifier is turned off and the speaker load is
connected between the V
+ terminal, through an output coupling capacitor,
O
and system ground. For more information, see the TPA311 amplifier IC data
sheet, TI Literature Number SLOS207.
To operate in the bridge-tied load output mode, the module SE/BTL control
input terminal must be held low. The module output signal from OUT+ must go
through the speaker load and be returned directly to OUT–, and not to system
ground. This requires that the OUT– line be isolated not only from system
ground, but also from the OUT– lines of any other amplifiers in the system. The
platform provides such isolated output lines from the amplifier EVM sockets
directly to separate left and right speaker connectors.
3-4
Details
3.2.3 SIngle-Ended Operation
For single-ended operation, the module SE/BTL control input pin must be held
high. The speaker (or headphone) load is connected to the module OUT+
output pin through a coupling capacitor, and to platform/system ground. A
470-µF electrolytic coupling capacitor is provided on the platform in the signal
path to the headphone output jack for this purpose and a control signal from
the platform headphone jack can be routed to the module control input pin to
switch the TPA311 IC to the single-ended mode.
In the single-ended mode, the amplifier inside the TPA311 IC that drives the
OUT– line does not operate and does not dissipate any power. The OUT– pin
goes into a high-impedance state and can be left connected or allowed to float.
3.2.4 Module Gain
The TP A31 1 MSOP evaluation module has a set gain of 2. However, the gain
can be adjusted to a maximum of 22 by changing the value of resistor R3
(Figure 3–3). Use the following equation to determine value of R
Gain
+
The TPA311 MSOP Audio Power Amplifier Evaluation Module
–R
3
R
2
3:
3.2.5 Shutdown
The TP A311 amplifier IC, as most other amplifiers, exhibits its best distortion
and noise performance at lower gain levels (see the TP A311 data sheet). Even
so, the TP A311 at its highest gain setting has significantly less distortion than
most low-cost speakers.
Gain versus total harmonic distortion (THD) should be considered in each
application. Both the module input signal level and the TP A31 1 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 TP A31 1 input, and the TPA31 1 gain should be kept as low as
possible.
When the shutdown terminal of the TP A311 amplifier IC is taken high, the IC
ceases operation and enters an ultralow-power state. This is accomplished by
applying a control signal to the module shutdown 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 shutdown (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 (JP8).
Details
3-5
Using The TP A311 MSOP EVM With the Plug-N-Play Evaluation Platform
3.3 Using The TPA311 MSOP EVM With the Plug-N-Play Evaluation Platform
The TPA311 MSOP audio amplifier evaluation module was designed to be
used with the TI plug-n-play audio amplifier evaluation platform. It simply plugs
into socket U3 or U4.
The following paragraphs provide additional details for using the TPA311
MSOP EVM 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
3.3.1.2 EVM Removal
1) Remove all power from the evaluation platform
2) Locate socket U3 or U4 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
1) Remove all power from the evaluation platform
2) Using an appropriate tool as a lever, gently pry up one side of the module
a small amount
3) Change to the opposite side of the module and use the tool to pry that side
up a small amount
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
3-6
5) Lift the EVM off of the platform
Details
Using The TP A311 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
Off
R
Audio
Input
L
U1
Signal
Conditioning
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
audio input signal applied directly to the inputs of the TP A311 power amplifiers.
-
Switch S2 selects signal conditioning or bypasses it
S2
On
TPA311
Amplifier EVM
TPA311
Amplifier EVM
U5
Stereo
Headphone
Amplifier
U3
U4
+
GND
R
L
R
L
–
J7, J8, J9
Speaker
Outputs
–
+
+
–
Headphone
Output
–
+
J10
R
L
U2–U4
R
S3
L
U5
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) and can
output either the signal from the headphone amplifier in socket U5, or the
signal from the TPA311 power amplifiers installed in sockets U3 and U4, as
determined by the setting of headphone source select switch S3.
When S3 is set to the power amplifier position (U2 – U4), the headphone jack
is connected to the TP31 1 power amplifier OUT+ output lines. When a plug is
inserted into the jack, signals output through J10 are returned to platform
ground, requiring single-ended power amplifier operation. A switch inside the
headphone jack produces a control signal that can be routed to the power
amplifier sockets to shut down the TPA311 MSOP EVMs when a plug is
inserted.
Source select switch S3 connects the headphone jack to the output lines of
either the headphone amplifier socket U5, or the power amplifier sockets
(U2 – U4).
J
T o keep the TPA31 1 amplifier outputs separated, set switch S3 to the
headphone amplifier position (U5) and use the speaker outputs (J7,
J8, and J9)
J
To route the TPA311 amplifier outputs to the headphone output jack
(J10), set switch S3 to the power amplifier position (U2 – U4) — use
this setting only if the TP A31 1 MSOP EVMs are to drive single-ended
loads connected to J10
Details
3-7
Using The TP A311 MSOP EVM With the Plug-N-Play Evaluation Platform
3.3.3 Mute/Mode
The TP A311 MSOP EVM is equipped with a mute (shutdown) control input pin.
When this input is tied to VDD, the TPA311 amplifier IC on the module shuts
down and assumes an ultralow-power mode. When the EVM 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 shut down (muted) to
conserve power.
A mode control input pin on the EVM switches the TPA311 amplifier IC
between the bridge-tied load (BTL) output mode and the single-ended output
mode. When the mode control input is tied to GND, the module operates in the
BTL output mode. When this input is tied to V
single-ended output mode.
In the typical application, output mode switching allows the TP A31 1 to operate
in the BTL output mode for increased power to internal speakers and then
switch to single-ended mode to drive headphones when a plug is inserted into
the headphone jack.
, the module operates in the
DD
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 (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
240 Ω resistor (R3) depending on whether or not a plug is inserted in J10.
Figure 3–6.Mute/Mode and Polarity Control
V
DD
R3
240 Ω
J10
Headphone
Jack
R4
1 kΩ
R5
1 kΩ
Polarity
JP8 JP6
Lo
Hi
SPK
(U2–U4)
Mode
Mute
through a
DD
U3, U4
Power
Amplifiers
3-8
Details
Using The TP A311 MSOP EVM With the Plug-N-Play Evaluation Platform
3.3.3.2 Mute/Mode Select (JP6)
A 3-pin jumper header (JP6) on the platform, functioning as a SPDT switch,
routes the control signal from the headphone jack to either the mute control
input pin or the mode control input pin of the evaluation module.
J
To mute the TPA311 MSOP amplifier module using the control signal
from the platform headphone jack, jumper JP6 to MUTE.
J
To switch the output mode of the TPA311 amplifier between BTL and
single-ended using the control signal from the platform headphone
jack, jumper JP6 to MODE.
3.3.3.3 Mute/Mode Polarity Select (JP8)
A second 3-pin jumper header (JP8) on the platform selects the control signal
polarity by connecting either the active-high or the active-low line from the
headphone jack to jumper JP6.
-
When JP6 is set to mute, use the following JP8 settings for the TPA311:
J
To mute the TPA311 MSOP amplifier module when a plug is inserted
into the headphone jack, jumper JP8 to Hi (this is the typical setting).
J
To mute the TPA311 MSOP amplifier module until a plug is inserted
into the headphone jack, jumper JP8 to Lo.
-
When JP6 is set to mode, use the following JP8 settings for the TP A311:
J
To switch the TPA311 MSOP amplifier module to the single-ended
output mode when a plug is inserted into the headphone jack, jumper
JP8 to Hi (this is the typical setting).
J
T o switch the TP A311 MSOP amplifier module to the BTL output mode
when a plug is inserted into the headphone jack, jumper JP8 to Lo.
Details
3-9
Power Requirements
3.3.4 Power Requirements
The TP A311 MSOP audio power amplifier evaluation module can operate from
any voltage between approximately 2.5 V and 5.5 V; however, the TPA311
amplifier IC on the module is characterized for operation at 3.3 V and 5 V . For
best performance (highest output power with lowest distortion), the module
should be operated at approximately 5 V , unless there is a specific reason for
operating it from a lower voltage.
The TI plug-n-play audio amplifier evaluation platform with a voltage regulator
EVM installed on it can provide a regulated V
unregulated V
including an onboard 9-V battery . Or , an external regulated power source can
be used to supply V
evaluation modules installed on it.
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 TP A311 amplifier IC installed on the
evaluation module (6 V) or damage to the IC may result. In no case should
V
DD
screw terminals J6 of the platform, or the power protection circuit on the
V
DD
supply from a wide variety of
DD
voltage inputs between approximately 5.5 V and 12 V,
CC
voltage to the platform and the TPA311 MSOP
DD
voltage of the incorrect polarity or in excess of 6.1 V be applied to
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 V
15 V, or the overvoltage protection circuit on the V
voltage applied to the platform exceed
CC
bus will trip.
CC
3-10
Details
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
Amplified audio output signals 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 a miniature (1/8″) stereo
phone jack (J10), for headphones.
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 TP A311 power amplifier EVMs to operate in the highly-ef ficient
bridge-tied load configuration.
Inputs and Outputs
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 TPA31 1 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), requiring single-ended operation
of the power amplifiers.
Figure 3–7.Typical Headphone Plug
Left Right GND
Details
3-11
Using The TP A311 MSOP EVM Stand-Alone
3.4 Using The TPA311 MSOP EVM Stand-Alone
Using the TPA311 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 range and the isolated OUT+ and OUT– lines for BTL
operation requirement exists.
Note that the mute signal applied to the EVM shutdown pins must be able to
supply enough current to overcome the pulldown resistors on the modules
(20 kΩ || 20 kΩ for two EVMs).
3.4.1 TPA311 MSOP EVM Connected for BTL Output
Figure 3–8.TPA311 MSOP EVM Connected for Stereo BTL Output
5 VDC
Vdd GND
Shutdown
C5
+
†
U1
C3
R3
C4
TEXAS
INSTRUMENTS
SLOP123
OUT–
GND
OUT+
Audio
Input
(Right)
S1
R1
C2
R2
R4
C1
SE\BTL*
IN+
GND
TPA311 MSOP EVM
Right
Vdd GND
†
C3
R3
C4
GND
C5
OUT–
GND
OUT+
Left
External Mute
Control
(active high)
Shutdown
S1
R1
R4
SE\BTL*
5 VDC
+
U1
C2
R2
C1
TEXAS
Audio
Input
(Left)
†
Due to the very small size of the MSOP IC package, the standard part number TPA311 is replaced with the code TIAAB
Note: The SE/BTL* (SE/BTL
) EVM pin is pulled to GND through a 20-KΩ resistor on the module.
IN+
GND
INSTRUMENTS
SLOP123
TPA311 MSOP EVM
3-12
Details
Using The TP A311 MSOP EVM Stand-Alone
3.4.2 TPA311 MSOP EVM Connected for Single-Ended Output
Figure 3–9.TPA311 MSOP EVM Connected for Stereo Single-Ended Output
5 VDC
Vdd GND
Shutdown
C5
+
†
U1
C3
R3
C4
TEXAS
INSTRUMENTS
SLOP123
OUT–
GND
OUT+
Audio
Input
(Right)
S1
R1
C2
R2
R4
C1
SE\BTL*
IN+
GND
TPA311 MSOP EVM
+
33 µF –
1000 µF
Vdd GND
†
C3
R3
C4
GND
C5
OUT–
GND
OUT+
+
33 µF –
1000 µF
External Mute
Control
(active high)
Shutdown
S1
R1
R4
SE\BTL*
5 VDC
+
U1
C2
R2
C1
TEXAS
Audio
Input
(Left)
†
Due to the very small size of the MSOP IC package, the standard part number TPA311 is replaced with the code TIAAB
IN+
GND
INSTRUMENTS
SLOP123
TPA311 MSOP EVM
Details
3-13
TP A311 MSOP Audio Power Amplifier Evaluation Module Parts List
3.5 TPA311 MSOP Audio Power Amplifier Evaluation Module Parts List
Table 3–1. TPA311 MSOP EVM Parts List
Ref. Description Size
C5 Capacitor, 10 µF, 6.3 V A 1 Panasonic
C1, C2,C3Capacitor, 1 µF,
+80%/–20%, nonpolarized
C4 Capacitor, 5 pF 0603 1 Panasonic
R1, R2,R4Resistor, 20 kΩ, 1/16 W, 5% 0603 3 Panasonic
R3 Resistor, 39 kΩ, 1/16 W, 5% 0603 1 Panasonic
S1 Switch, momentary 1 Panasonic
Terminal Post Headers 9 Sullins
U1 IC, TPA311DGN†, audio
amplifier, 350 mW, mono
PCB1 PCB, TPA311 MSOP EVM 1
†
Due to the very small size of the MSOP IC package, the standard part number TPA311 is replaced with the code TIAAB
Note: All items are SMD except as noted.
0603 1 Murata
MSOP-8 1 TI
EVM
Qty.
Manufacturer/
Part Number
ECS-TOJY106R
GRM39-Y5V105Z10PT
ECU-V1H050CCV
ERJ-3GSYJ203
ERJ-3GSYJ393
P8048SCT-ND
PTC36SABN
TPA311
Vendor Number
Digi-Key
PCS1106CT-ND
Digi-Key
PCC050CVCT-ND
Digi-Key
P20KGCT-ND
Digi-Key
P39KGCT-ND
Digi-Key
P8048SCT-ND
Digi-Key
S1022-36-ND
3-14
Details
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