Texas Instruments Stereo Amplifier TPA701 User Manual

User’s Guide  
November 1998  
Mixed-Signal Products  
SLOU026A  
 
Preface  
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.  
TPA701 700-mW LOW-VOLTAGE AUDIO POWER AMPLIFIER  
(literature number SLOS229) This is the data sheet for the TPA701  
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.  
Trademarks  
TI is a trademark of Texas Instruments Incorporated.  
iii  
 
iv  
 
Contents  
1
2
3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1  
1.1  
1.2  
1.3  
Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2  
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3  
TPA701 EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4  
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 TPA701 MSOP Audio Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
3.2.1 TPA701 Audio Amplifier IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4  
3.2.2 BTL Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4  
3.2.3 Module Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4  
3.2.4 Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5  
Using The TPA701 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7  
3.3.4 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9  
3.3.5 Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9  
Using The TPA701 MSOP EVM Stand-ALone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11  
3.4.1 TPA701 MSOP EVM Connected for BTL Output . . . . . . . . . . . . . . . . . . . . . . . . 3-11  
TPA701 MSOP Audio Amplifier Evaluation Module Parts List . . . . . . . . . . . . . . . . . . . . 3-12  
3.3  
3.4  
3.5  
v
 
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 TPA701 MSOP Audio Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3  
Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2  
Quick Start Module Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4  
The TI Plug-N-Play Audio Amplifier Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
TPA701 MSOP EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
TPA701 MSOP EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
TPA701 Audio Amplifier IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4  
Platform Signal Routing and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7  
Mute/Mode and Polarity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8  
Typical Headphone Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10  
TPA701 MSOP EVM Connected for Stereo BTL Output . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11  
Tables  
2–1  
Typical TI Plug-N-Play Platform Jumper and Switch Settings for the  
TPA701 MSOP EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1  
2–2  
3–1  
Platform Jumper and Switch Settings for the TPA701 MSOP EVM . . . . . . . . . . . . . . . . . . . 2-3  
TPA701 MSOP EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12  
vi  
 
Chapter 1  
Introduction  
This chapter provides an overview of the Texas Instruments (TI ) TPA701  
MSOPAudio Amplifier Evaluation Module (SLOP213). 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 TPA701 MSOP EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 1–4  
1-1  
 
Feature Highlights  
1.1 Feature Highlights  
The TI TPA701 MSOP Audio Amplifier Evaluation Module and the TI  
Plug-N-Play Audio Amplifier Evaluation Platform include the following  
features:  
TPA701 Low-Voltage Audio Power Amplifier Evaluation Module  
Single channel, bridge-tied load (BTL)  
3.3-V and 5-V operation  
700-mW output power into 8 at 5 V, BTL  
Ultra-low current consumption in shutdown mode  
Internal thermal and short-circuit protection  
Module gain is set at –4 V/V in BTL mode, –2 V/V in SE mode  
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  
On-board 9-V battery  
External 5-V – 15-V (V ) supply inputs  
CC  
External regulated V  
supply input  
DD  
Socket for on-board 5 V/3.3 V V  
voltage regulator EVM  
DD  
On-board 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  
 
Description  
1.2 Description  
The TPA701 MSOP Audio Power Amplifier Evaluation Module is a complete,  
low-power single-channel audio power amplifier. It consists of the TI TPA701  
700-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 TPA701 Audio Amplifier Evaluation Module  
Vdd GND  
Shutdown  
+
C3  
S1  
R1  
C1  
U1  
C4  
OUT–  
GND  
R2  
C2  
OUT+  
R3  
C5  
TEXAS  
INSTRUMENTS  
IN  
SLOP213  
TPA701 MSOP EVM  
GND  
Due to the very small size of the MSOP IC package, the standard part number TPA701 is replaced with the code TIABA.  
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 TPA701 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,  
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  
Introduction  
 
TPA701 EVM Specifications  
1.3 TPA701 EVM Specifications  
Supply voltage range, V  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 V to 5.5 V  
DD  
Supply current, I  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450 mA, max  
DD  
Continuous output power, P : 8-BTL, V =5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700 mW  
O
DD  
Audio input voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Vpp, max  
I
Minimum load impedance, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ω  
L
1-4  
Introduction  
 
Chapter 2  
Quick Start  
ThestepsinthischaptercanbefollowedtoquicklypreparetheTPA701MSOP  
audio amplifier EVM for use. Using the TPA701 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  
usedstand-alonebymakingconnectionsdirectlytothemodulepins, anditcan  
be wired directly into existing circuits or equipment.  
The platform switch and jumper settings shown in Table 2–1 are typical for the  
TPA701 MSOP EVM. They will cause the TPA701 device to shutdown 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 TPA701  
MSOP EVM  
EVM  
JP6  
JP7  
JP8  
S2  
S3  
TPA701  
Mute  
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  
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  
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 on-board 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
9
Audio  
Input  
Speaker  
Output  
5
Mode  
Mute  
4
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  
HP Out  
R3  
R4  
R5  
2
3
2-2  
Quick Start  
 
Quick Start List for Platform  
2.2 Quick Start List for Platform  
Follow these steps when using the TPA701 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) EnsurethatallexternalpowersourcesaresettoOFF andthattheplatform  
power switch S1 is set to OFF.  
2) Install a TPA701 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 Mute control input (causes the TPA701 to  
shutdown if a plug is inserted into platform headphone jack J10).  
Table 2–2. Platform Jumper and Switch Settings for the TPA701 MSOP EVM  
EVM  
JP6  
JP7  
JP8  
S2  
S3  
TPA701  
Mute  
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  
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 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  
power input (see platform user’s guide).  
power input J1 or J2 and jumper the appropriate  
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 8-– 32-speakers to left and right RCA jacks J7 and J9 or to  
stripped wire connectors J8.  
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  
 
Quick Start List for Stand-Alone  
2.3 Quick Start List for Stand-Alone  
Follow these steps to use the TPA701 MSOP EVM stand-alone or when  
connecting it into existing circuits or equipment. Connections to the TPA701  
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  
+
C3  
5
S1  
R1  
C1  
U1  
C4  
OUT–  
GND  
6
R2  
C2  
OUT+  
R3  
C5  
TEXAS  
INSTRUMENTS  
IN  
4
SLOP213  
TPA701 MSOP EVM  
GND  
Due to the very small size of the MSOP IC package, the standard part number TPA701 is replaced with the code TIABA  
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 (S1) pin to V  
through a Normally Open switch.  
DD  
6) Connect an 8-– 32-speaker to the module OUT+ and OUT– pins.  
Power-up  
7) Verify correct voltage and input polarity and set the external power supply  
to ON.  
The EVM should begin operation.  
8) Adjust the signal source level as needed.  
2-4  
Quick Start  
 
Chapter 3  
Details  
This chapter provides details on the TPA701 IC, the evaluation module, the  
steps in the Quick-Start List, additional application information, and a parts list  
for the TPA701 MSOP evaluation module.  
Topic  
Page  
3.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2  
3.2 The TPA701 MSOP Audio Power Amplifier Evaluation Module . . 3–3  
3.3 Using The TPA701 MSOP EVM With The Plug-N-Play  
Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6  
3.4 Using The TPA701 MSOP EVM Stand-Alone . . . . . . . . . . . . . . . . . . . . 3–11  
3.5 TPA701 MSOP Audio Power Amplifier Evaluation  
Module Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–12  
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  
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 on-board 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  
F1  
ICC  
JP4  
C1+  
VR1  
DC  
Power  
In/Out  
Power  
Input  
R2  
R1  
Audio  
Power  
Amps  
Signal Conditioning  
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  
HP Out  
R3  
R4  
R5  
3-2  
Details  
 
The TPA701 MSOP Audio Power Amplifier Evaluation Module  
3.2 The TPA701 MSOP Audio Power Amplifier Evaluation Module  
The TPA701 MSOP Audio Power Amplifier Evaluation Module is powered by  
a TPA701 700-mW Low-Power Audio Amplifier IC and includes an on-board  
shutdown control signal switch.  
The module can be used with the TI Plug-N-Play Audio Amplifier Evaluation  
Platform (Figure 31) 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 33.  
Figure 3–2. TPA701 MSOP EVM  
Vdd GND  
C3  
Shutdown  
+
S1  
R1  
C1  
U1  
C4  
OUT–  
GND  
R2  
C2  
OUT+  
R3  
C5  
TEXAS  
INSTRUMENTS  
IN  
SLOP213  
TPA701 MSOP EVM  
GND  
Due to the very small size of the MSOP IC package, the standard part number TPA701 is replaced with the code TIABA  
Figure 3–3. TPA701 MSOP EVM Schematic Diagram  
VDD  
2.5 V to 5.5 V  
GND  
C3  
10 µF  
+
S1  
No  
1
2
3
8
7
6
Shutdown V  
Shutdown  
O–  
R1  
20 kΩ  
Bypass GND  
C1  
1 µF  
OUT–  
GND  
In+  
In–  
V
DD  
C4  
1 µF  
4
5
V
O+  
OUT+  
C2  
1 µF  
C5  
5 pF  
R3  
39 kΩ  
Audio Input–  
GND  
R2  
20 kΩ  
3-3  
Details  
 
The TPA701 MSOP Audio Power Amplifier Evaluation Module  
3.2.1 TPA701 Audio Amplifier IC  
The TPA701 audio amplifier IC is a CMOS device intended for bridge-tied 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 700 mW into an 8-, BTL (Figure 34). Typical applications  
include portable phones, toys, games, and similar hand-held audio  
applications.  
Figure 3–4. TPA701 Amplifier IC  
4
_
+
5
IN –  
3
OUT+  
IN+  
6
V
2
DD  
V
DD  
/2  
_
+
BYPASS  
7
8
OUT–  
GND  
1
Bias Control  
SHUTDOWN  
The IC includes two separate internal amplifiers. The two amplifiers operate  
as mirror images of each other for increased power. BTL operation provides  
many benefits, including quadruple the output power of single-ended  
operation and no need for bulky output coupling capacitors. For more  
information, see the TPA701 amplifier IC data sheet, TI Literature Number  
SLOS229.  
3.2.2 BTL Operation  
The 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.  
3.2.3 Module Gain  
The TPA701 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  
3:  
–R  
3
Gain  
2 for BTL  
R
2
3-4  
Details  
 
The TPA701 MSOP Audio Power Amplifier Evaluation Module  
The TPA701 amplifier IC, like most other amplifiers, exhibits its best distortion  
and noise performance at lower gain levels (see the TPA701datasheet). Even  
so, the TPA701 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 TPA701 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 TPA701 input, and the TPA701 gain should be kept as low as  
possible.  
3.2.4 Shutdown  
When the shutdown terminal of the TPA701 amplifier IC is taken high, the IC  
ceases operation and enters an ultra-low 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).  
3-5  
Details  
 
Using The TPA701 MSOP EVM With the Plug-N-Play Evaluation Platform  
3.3 Using The TPA701 MSOP EVM With the Plug-N-Play Evaluation Platform  
The TPA701 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 TPA701  
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  
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.  
3.3.1.2 EVM Removal  
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.  
5) Lift the EVM off of the platform.  
3-6  
Details  
 
Using The TPA701 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 35.  
Figure 3–5. Platform Signal Routing and Outputs  
Off  
U3  
TPA701  
Amplifier EVM  
+
R
R
L
R
J7, J8, J9  
Speaker  
Outputs  
U1  
Signal  
Conditioning  
Audio  
Input  
S2  
U4  
TPA701  
Amplifier EVM  
+
L
L
On  
U2U4  
R
+
R
U5  
Stereo  
Headphone  
Amplifier  
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  
audioinputsignalapplieddirectlytotheinputsoftheTPA701poweramplifiers.  
Switch S2 selects signal conditioning or bypasses it  
3.3.3 Mute/Mode  
The TPA701 MSOP EVM is equipped with a shutdown (mute) control input pin.  
When this input is tied to V , the TPA701 amplifier IC on the module shuts  
DD  
down and assumes an ultra-low 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.  
3.3.3.1 Headphone Jack Control Signals  
The platform headphone output jack (J10) contains an internal switch that  
changesthestateofapairofcontrollineswhenaplugisinserted(Figure3–6).  
Each control line is pulled down by a 1-kresistor to ground (R4 and R5). The  
switch in the headphone jack pulls one line or the other up to V  
through a  
DD  
240 resistor (R3) depending on whether or not a plug is inserted in J10.  
3-7  
Details  
 
Using The TPA701 MSOP EVM With the Plug-N-Play Evaluation Platform  
Figure 3–6. Mute/Mode and Polarity Control  
V
DD  
R3  
240 Ω  
Polarity  
JP8  
JP6  
Mode  
Mute  
Lo  
U3, U4  
Power  
Amplifiers  
J10  
Headphone  
Jack  
Hi  
R4  
1 kΩ  
R5  
1 kΩ  
SPK  
(U2–U4)  
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.  
To mute the TPA701 MSOP amplifier module using the control signal  
from the platform headphone jack, jumper JP6 to MUTE.  
To not affect the TPA701 amplifier when a plug is inserted into the  
headphone jack, jumper JP6 to Mode or leave JP6 unjumpered.  
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 TPA701:  
To mute the TPA701 MSOP amplifier module when a plug is inserted  
into the headphone jack, jumper JP8 to Hi (this is the typical setting).  
To mute the TPA701 MSOP amplifier module until a plug is inserted  
into the headphone jack, jumper JP8 to Lo.  
When JP6 is set to Mode, the TPA701 amplifier is unaffected by the inser-  
tion of the headphone plug.  
3-8  
Details  
 
Power Requirements  
3.3.4 Power Requirements  
The TPA701 MSOP Audio Power Amplifier Evaluation Module can operate  
from any voltage between approximately 2.5 V and 5.5 V; however, the  
TPA701 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  
supply from a wide  
DD  
variety of unregulated V  
voltage inputs between approximately 5.5 V and  
CC  
12 V, including an on-board 9-V battery. Or, an external regulated power  
source can be used to supply V voltage to the platform and the TPA701  
DD  
MSOP 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.  
V
voltage applied to platform screw terminals J6 MUST NOT exceed  
DD  
the absolute maximum rating for the TPA701 amplifier IC installed on the  
evaluation module (6 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
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  
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).  
3-9  
Details  
 
Inputs and Outputs  
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 TPA701 power amplifier EVMs to operate in the highly-efficient  
bridge-tied load configuration.  
Figure 3–7. Typical Headphone Plug  
Left  
Right  
GND  
3-10  
Details  
 
Using The TPA701 MSOP EVM Stand-Alone  
3.4 Using The TPA701 MSOP EVM Stand-Alone  
Using the TPA701 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 k|| 20 kfor two EVMs).  
3.4.1 TPA701 MSOP EVM Connected for BTL Output  
Figure 3–8. TPA701 MSOP EVM Connected for Stereo BTL Output  
5 VDC  
Vdd GND  
Shutdown  
+
C3  
S1  
R1  
C1  
U1  
C4  
OUT–  
GND  
Right  
R2  
C2  
OUT+  
R3  
C5  
TEXAS  
INSTRUMENTS  
Audio  
Input  
(Right)  
IN  
SLOP213  
TPA701 MSOP EVM  
GND  
5 VDC  
GND  
Vdd GND  
Shutdown  
External Mute  
Control  
+
C3  
S1  
(active high)  
R1  
C1  
U1  
C4  
OUT–  
GND  
Left  
R2  
C2  
OUT+  
R3  
C5  
TEXAS  
INSTRUMENTS  
Audio  
Input  
(Left)  
IN  
SLOP213  
TPA701 MSOP EVM  
GND  
Due to the very small size of the MSOP IC package, the standard part number TPA701 is replaced with the code TIABA.  
3-11  
Details  
 
TPA701 MSOP Audio Power Amplifier Evaluation Module Parts List  
3.5 TPA701 MSOP Audio Power Amplifier Evaluation Module Parts List  
Table 3–1. TPA701 MSOP EVM Parts List  
EVM  
Qty.  
Manufacturer/  
Part Number  
Ref.  
C3  
Description  
Size  
Digi-Key Number  
Capacitor, 10 µF, 6.3 V  
A
1
Panasonic  
ECS-TOJY106R  
Digi-Key  
PCS1106CT-ND  
C1, C2, Capacitor, 1 µF,  
0603  
3
Murata  
GRM39-Y5V105Z10PT  
C4  
+80%/–20%,  
nonpolarized  
C5  
Capacitor, pad only  
0603  
0
2
R1, R2  
Resistor, 20 k, 1/16 W, 0603  
5%  
Panasonic  
ERJ-3GSYJ203  
R3  
S1  
Resistor, 39 k, 1/16 W, 0603  
1
1
9
1
Panasonic  
ERJ-3GSYJ393  
5%  
Switch, momentary  
Panasonic  
P8048SCT-ND  
Digi-Key  
P8048SCT-ND  
Terminal Post Headers  
Sullins  
PTC36SABN  
Digi-Key  
S1022-36-ND  
U1  
IC, TPA701DGN , audio MSOP  
TI  
amplifier, 700 mW,  
mono  
-8  
TPA701DGN  
PCB1  
PCB, TPA701 MSOP  
EVM  
1
Due to the very small size of the MSOP IC package, the standard part number TPA701 is replaced with the code TIABA.  
Note: All items are SMD except as noted.  
3-12  
Details  
 

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