Texas Instruments Stereo Amplifier SLOU020A User Manual

User’s Guide  
2001  
Mixed-Signal Products  
SLOU020A  
 
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.  
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.  
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  
TPA311 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 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  
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  
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  
TPA311 MSOP Audio Amplifier Evaluation Module Parts List . . . . . . . . . . . . . . . . . . . . 3-14  
3.3  
3.4  
3.5  
v
 
Figures  
11  
21  
22  
31  
32  
33  
34  
35  
36  
37  
38  
39  
The TI TPA311 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  
TPA311 MSOP EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
TPA311 MSOP EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
TPA311 Audio Amplifier IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4  
Platform Signal Routing and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7  
Mute/Mode and Polarity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8  
Typical Headphone Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11  
TPA311 MSOP EVM Connected for Stereo BTL Output . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12  
TPA311 MSOP EVM Connected for Stereo Single-Ended Output . . . . . . . . . . . . . . . . . . . 3-13  
Tables  
21  
Typical TI Plug-N-Play Platform Jumper and Switch Settings for the  
TPA311 MSOP EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1  
Platform Jumper and Switch Settings for the TPA311 MSOP EVM . . . . . . . . . . . . . . . . . . . 2-3  
TPA311 MSOP EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14  
22  
31  
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 TPA311 MSOP EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3  
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  
Single channel, bridge-tied load (BTL) or single-ended operation  
3.3-V and 5-V operation  
350 mW output power into 8 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  
Quick and Easy Configuration With the TI Plug-N-Play Audio Amplifier  
Evaluation Platform  
Evaluation module is designed to simply plug into the platform, auto-  
matically 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/3.3 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  
 
Description  
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 TPA311  
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 11).  
Figure 11. The TI TPA311 Audio Amplifier Evaluation Module  
Vdd GND  
Shutdown  
C5  
+
S1  
R1  
U1  
C3  
C2  
OUT–  
GND  
R2  
C1  
R4  
OUT+  
R3  
C4  
SE\BTL*  
TEXAS  
INSTRUMENTS  
IN+  
SLOP123  
TPA311 MSOP EVM  
GND  
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 TPA311 MSOP evaluation modules and is  
a convenient vehicle for demonstrating TIs audio power amplifier and related  
evaluation modules. The EVMs simply plug into the platform, which auto-  
matically provides power to the modules, interconnects them correctly, and  
connectsthemtoaversatilearrayofstandardaudioinputandoutputjacksand  
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  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 V to 5.5 V  
DD  
Supply current, I  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 mA, max  
DD  
Continuous output power, P : 8-BTL, V =5 V: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350 mW  
O
DD  
32-BTL, V =5 V: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 mW  
DD  
Audio input voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Vpp, max  
I
Minimum load impedance, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ω  
L
1-3  
Introduction  
 
1-4  
Introduction  
 
Chapter 2  
Quick Start  
The steps in this chapter can be followed to quickly prepare the TPA311MSOP  
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 Table 21 are typical for the  
TPA311 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 21. 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 = Dont care  
2) Set S2 to ON when signal conditioning board is installed in U1; set S2  
to OFF when no signal conditioning board is installed.  
Topic  
Page  
2.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22  
2.2 Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
2.3 Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
2-1  
 
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 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 21. Quick Start Platform Map  
7b  
7b  
1
11  
7b  
ICC  
JP4  
C1+  
F1  
VR1  
DC  
Power  
In/Out  
7a  
Power  
Input  
7b  
R2  
R1  
Audio  
Power  
Amps  
Signal Conditioning  
Audio  
Input  
9
Speaker  
Output  
10  
5
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
4
6
2-2  
Quick Start  
 
Quick Start List for Platform  
2.2 Quick Start List for Platform  
Follow these steps when using the TPA311 MSOP EVM with the TI plug-n-play  
audio amplifier evaluation platform (see the platform users guide, SLOU011,  
for additional details). Numbered callouts for selected steps are shown in  
Figure 21 and details appear in Chapter 3.  
Platform preparations  
1) EnsurethatallexternalpowersourcesaresettoOFF andthattheplatform  
power switch S1 is set to OFF.  
2) Install a TPA311 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 U2U4.  
Table 22. 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 = Dont care  
2) Set S2 to ON when signal conditioning board is installed in U1; set S2  
to OFF when no signal conditioning board is installed.  
Power supply  
7) Select and connect the power supply:  
a) Connect an external regulated power supply set to a voltage between  
2.5 V and 5.5 V to platform V  
to observe marked polarity,  
power input connector J6 taking care  
or  
DD  
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 users guide).  
power input J1 or J2 and jumper the appropriate  
CC  
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 8-32-speakers to left and right RCA jacks J7 and J9 or to  
stripped wire connectors J8.  
Power-up  
11) 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.  
12) 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 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 22 and details appear in Chapter 3.  
Figure 22. Quick Start Module Map  
2
Vdd GND  
Shutdown  
S1  
C5  
5
+
R1  
U1  
C3  
C2  
OUT–  
6
7
GND  
R2  
C1  
R4  
OUT+  
R3  
C4  
SE\BTL*  
TEXAS  
INSTRUMENTS  
IN+  
4
SLOP123  
TPA311 MSOP EVM  
GND  
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 8-32-speaker to the module OUT+ and  
OUTpins, or  
7) For single-ended output, connect a headphone or an 8-32-speaker  
to the module OUT+ and GND pins through a 33 µF to 1000 µF output-  
coupling capacitor (figure 39).  
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  
 
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32  
3.2 The TPA311 MSOP Audio Power Amplifier Evaluation Module . . . . 33  
3.3 Using The TPA311 MSOP EVM With The Plug-N-Play  
Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36  
3.4 Using The TPA311 MSOP EVM Stand-Alone . . . . . . . . . . . . . . . . . . . 312  
3.5 TPA311 MSOP Audio Power Amplifier  
Evaluation Module Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314  
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 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 31. 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  
 
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 TPA311 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 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 32 and its schematic is shown in Figure 33.  
Figure 32. TPA311 MSOP EVM  
Vdd GND  
Shutdown  
S1  
C5  
+
R1  
U1  
C3  
C2  
OUT–  
GND  
R2  
C1  
R4  
OUT+  
R3  
C4  
SE\BTL*  
TEXAS  
INSTRUMENTS  
IN+  
SLOP123  
TPA311 MSOP EVM  
GND  
Due to the very small size of the MSOP IC package, the standard part number TPA311 is replaced with the code TIAAB  
Figure 33. TPA311 MSOP EVM Schematic Diagram  
VDD  
2.5 V to 5.5 V  
GND  
C5  
10 µF  
+
S1  
No  
1
2
3
8
7
6
Shutdown V  
Shutdown  
O–  
R1  
20 kΩ  
Bypass GND  
C2  
1 µF  
OUT–  
SE/BTL  
In  
V
DD  
C3  
1 µF  
GND  
SE/BTL  
4
5
V
O+  
R4  
20 kΩ  
OUT+  
C1  
1 µF  
C4  
5 pF  
R3  
40 kΩ  
Audio Input+  
GND  
R2  
20 kΩ  
3-3  
Details  
 
The TPA311 MSOP Audio Power Amplifier Evaluation Module  
3.2.1 TPA311 Audio Amplifier IC  
The TPA311 audio amplifier IC is a CMOS device intended primarily for bridge-  
tied load (BTL) operation in battery-powered applications. It is supplied in a  
verysmallsurface-mountpackageandhasbeendesignedtooperatefromlow  
supply voltages (between approximately 2.5 V and 5.5 V) and deliver up to  
approximately 350 mW into an 8-, BTL (Figure 34). Typical applications in-  
clude portable phones, toys, games, and similar hand-held audio applications.  
Figure 34. TPA311 Amplifier IC  
6
V
DD  
V
DD  
/2  
4
_
+
5
IN  
V
O
+
2
Bypass  
_
+
8
7
V
O
1
Bias  
Control  
Shutdown  
3
GND  
SE/BTL  
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 V , and neither line is connected to ground. BTL operation  
O
O
provides many benefits, including quadruple the output power of single-ended  
operation and no need for bulky output coupling capacitors. In the single-  
ended 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.  
3.2.2 BTL Operation  
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 OUTline be isolated not only from system  
ground, but also from the OUTlines 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  
 
The TPA311 MSOP Audio Power Amplifier Evaluation Module  
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  
OUTline does not operate and does not dissipate any power. The OUTpin  
goes into a high-impedance state and can be left connected or allowed to float.  
3.2.4 Module Gain  
The TPA311 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 33). Use the following equation to determine value of R  
3:  
R3  
Gain  
R2  
The TPA311 amplifier IC, as most other amplifiers, exhibits its best distortion  
and noise performance at lower gain levels (see the TPA311 data sheet). Even  
so, the TPA311 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 TPA311 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 TPA311 input, and the TPA311 gain should be kept as low as  
possible.  
3.2.5 Shutdown  
When the shutdown terminal of the TPA311 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 shut-  
down switch, S1, on the module. When the control signal goes low or is re-  
moved (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 TPA311 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  
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 TPA311 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 35. Platform Signal Routing and Outputs  
Off  
U3  
TPA311  
Amplifier EVM  
+
R
R
L
R
J7, J8, J9  
Speaker  
Outputs  
U1  
Signal  
Conditioning  
Audio  
Input  
S2  
U4  
TPA311  
L
+
Amplifier EVM  
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  
audio input signal applied directly to the inputs of the TPA311 power amplifiers.  
Switch S2 selects signal conditioning or bypasses it  
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 TP311 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).  
To keep the TPA311 amplifier outputs separated, set switch S3 to the  
headphone amplifier position (U5) and use the speaker outputs (J7,  
J8, and J9)  
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 TPA311 MSOP EVMs are to drive single-ended  
loads connected to J10  
3-7  
Details  
 
Using The TPA311 MSOP EVM With the Plug-N-Play Evaluation Platform  
3.3.3 Mute/Mode  
The TPA311 MSOP EVM is equipped with a mute (shutdown) control input pin.  
When this input is tied to V , the TPA311 amplifier IC on the module shuts  
DD  
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 , the module operates in the  
DD  
single-ended output mode.  
In the typical application, output mode switching allows the TPA311 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.  
3.3.3.1 Headphone Jack Control Signals  
The platform headphone output jack (J10) contains an internal switch that  
changesthestateofapairofcontrollineswhenaplugisinserted(Figure36).  
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.  
Figure 36. 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  
(U2U4)  
3-8  
Details  
 
Using The TPA311 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.  
To mute the TPA311 MSOP amplifier module using the control signal  
from the platform headphone jack, jumper JP6 to MUTE.  
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:  
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).  
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 TPA311:  
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).  
To switch the TPA311 MSOP amplifier module to the BTL output mode  
when a plug is inserted into the headphone jack, jumper JP8 to Lo.  
3-9  
Details  
 
Power Requirements  
3.3.4 Power Requirements  
TheTPA311MSOPaudiopoweramplifierevaluationmodulecanoperatefrom  
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  
supply from a wide variety of  
DD  
unregulated V  
voltage inputs between approximately 5.5 V and 12 V,  
CC  
including an onboard 9-V battery. Or, an external regulated power source can  
be used to supply V voltage to the platform and the TPA311 MSOP  
DD  
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 TPA311 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  
3-10  
Details  
 
Inputs and Outputs  
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 OUTlines from  
the power amplifier sockets are not tied to each other or to platform ground.  
This allows the TPA311 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 35). When the TPA311 output  
signal is routed to J10 by S3, signals output via J10 are returned to platform  
ground when a plug is inserted (Figure 37), requiring single-ended operation  
of the power amplifiers.  
Figure 37. Typical Headphone Plug  
Left  
Right  
GND  
3-11  
Details  
 
Using The TPA311 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 OUTlines 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 TPA311 MSOP EVM Connected for BTL Output  
Figure 38. TPA311 MSOP EVM Connected for Stereo BTL Output  
5 VDC  
Vdd GND  
Shutdown  
C5  
+
S1  
R1  
U1  
C3  
C2  
OUT–  
Right  
GND  
R2  
C1  
R4  
OUT+  
R3  
C4  
SE\BTL*  
TEXAS  
INSTRUMENTS  
Audio  
Input  
(Right)  
IN+  
SLOP123  
TPA311 MSOP EVM  
GND  
5 VDC  
GND  
Vdd GND  
Shutdown  
External Mute  
Control  
(active high)  
C5  
+
S1  
R1  
U1  
C3  
C2  
OUT–  
GND  
Left  
R2  
C1  
R4  
OUT+  
R3  
C4  
SE\BTL*  
TEXAS  
INSTRUMENTS  
Audio  
Input  
(Left)  
IN+  
SLOP123  
TPA311 MSOP EVM  
GND  
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-Kresistor on the module.  
3-12  
Details  
 
Using The TPA311 MSOP EVM Stand-Alone  
3.4.2 TPA311 MSOP EVM Connected for Single-Ended Output  
Figure 39. TPA311 MSOP EVM Connected for Stereo Single-Ended Output  
5 VDC  
Vdd GND  
Shutdown  
C5  
+
S1  
R1  
U1  
C3  
C2  
OUT–  
GND  
R2  
C1  
R4  
OUT+  
R3  
C4  
SE\BTL*  
TEXAS  
INSTRUMENTS  
Audio  
Input  
(Right)  
+
33 µF –  
1000 µF  
IN+  
SLOP123  
TPA311 MSOP EVM  
GND  
5 VDC  
GND  
Vdd GND  
Shutdown  
External Mute  
Control  
(active high)  
33 µF –  
1000 µF  
C5  
+
S1  
R1  
+
U1  
C3  
C2  
OUT–  
GND  
R2  
C1  
R4  
OUT+  
R3  
C4  
SE\BTL*  
TEXAS  
INSTRUMENTS  
Audio  
Input  
(Left)  
IN+  
SLOP123  
TPA311 MSOP EVM  
GND  
Due to the very small size of the MSOP IC package, the standard part number TPA311 is replaced with the code TIAAB  
3-13  
Details  
 
TPA311 MSOP Audio Power Amplifier Evaluation Module Parts List  
3.5 TPA311 MSOP Audio Power Amplifier Evaluation Module Parts List  
Table 31. TPA311 MSOP EVM Parts List  
EVM  
Qty.  
Manufacturer/  
Part Number  
Ref.  
C5  
Description  
Size  
Vendor Number  
Capacitor, 10 µF, 6.3 V  
A
1
1
1
3
1
1
9
1
1
Panasonic  
ECS-TOJY106R  
Digi-Key  
PCS1106CT-ND  
C1, C2, Capacitor, 1 µF,  
C3  
0603  
0603  
0603  
0603  
Murata  
GRM39-Y5V105Z10PT  
+80%/20%, nonpolarized  
C4  
Capacitor, 5 pF  
Panasonic  
ECU-V1H050CCV  
Digi-Key  
PCC050CVCT-ND  
R1, R2, Resistor, 20 k, 1/16 W, 5%  
R4  
Panasonic  
ERJ-3GSYJ203  
Digi-Key  
P20KGCT-ND  
R3  
S1  
Resistor, 39 k, 1/16 W, 5%  
Switch, momentary  
Panasonic  
ERJ-3GSYJ393  
Digi-Key  
P39KGCT-ND  
Panasonic  
P8048SCT-ND  
Digi-Key  
P8048SCT-ND  
Terminal Post Headers  
Sullins  
Digi-Key  
S1022-36-ND  
PTC36SABN  
U1  
IC, TPA311DGN , audio  
MSOP-8  
TI  
amplifier, 350 mW, mono  
PCB, TPA311 MSOP EVM  
TPA311  
PCB1  
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.  
3-14  
Details  
 

Technicolor Thomson MP3 Player PDP2842 User Manual
Tektronix Printer 071 0389 00 User Manual
Teledex Telephone Opal RediDock User Manual
Texas Instruments Calculator NAVNSCRK302L1 User Manual
Timex Heart Rate Monitor W228 User Manual
Trane Film Camera 13RT PRC005 EN User Manual
Viking Oven F20554 EN User Manual
VistaQuest Digital Camera VQ 7024 User Manual
VTech Cordless Telephone ev 2653 User Manual
Walker Indoor Furnishings WQ42BC1BL User Manual