Sure Electronics PAM8803 User manual

2*2W @4ΩPAM8803 Class-D
Audio Amplifier Board
User’s Guide
©2004-2010 Sure Electronics Inc. AA-AB32131&AA-AB32133_Ver1.0

2*2W @4ΩPAM8803 CLASS-D
AUDIO AMPLIFIER BOARD
USER’S GUIDE
©2004-2010 Sure Electronics Inc.
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Table of Contents
Chapter 1. Overview ..........................................................................................................1
1.1 Overview .............................................................................................................. 1
1.2 Features ............................................................................................................... 2
1.3 Applications......................................................................................................... 3
1.4 Benefits ................................................................................................................ 3
1.5 Quick Start ........................................................................................................... 3
Chapter 2. Hardware Detail ...............................................................................................5
2.1 Power Connection............................................................................................... 5
2.2 Input Connection................................................................................................. 6
2.3 Output Connections............................................................................................ 6
2.4 Mute Settings....................................................................................................... 7
2.5 Sleep Settings ..................................................................................................... 9
2.6 Volume Control Settings .................................................................................. 12
2.7 Volume Control ................................................................................................. 12
2.8 LED Indicator..................................................................................................... 14
2.9 Notes .................................................................................................................. 14
Chapter 3. Electrical Characteristics .............................................................................15
Chapter 4. Mechanical Drawing......................................................................................17
Chapter 5. Appendix ........................................................................................................18
Chapter 6. Contact Us .....................................................................................................19

2*2W @4ΩPAM8803 Class-D Audio Amplifier Board
©2004-2010 Sure Electronics Inc
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NOTES:
Product Version ：Ver 1.0
Document Version ：Ver 1.0

2*2W @4ΩPAM8803 CLASS-D
AUDIO AMPLIFIER BOARD
USER’S GUIDE
©2004-2010 Sure Electronics Inc.
Chapter 1. Overview
1.1 Overview
Thanks for using 2*2W audio amplifier board series. Each member is a high-quality
dual-channel class-D audio amplifier board capable of delivering 2W per channel of
output power into a 4load. It employs PAM’s PAM8803 IC which offers 64-step digital
volume control and low THD+N, allowing it to produce high-quality sound reproduction.
It’s especially suitable for small speakers. This amplifier board can also be used to drive
passive 4or 8speakers.
TABLE 1-1 2*2W AUDIO AMPLIFIER BOARD SERIES
Product No. Product Name
AA-AB32131 2*2W @4PAM8803 Class-D Audio Amplifier Full-featured Board
AA-AB32133 2*2W @4PAM8803 Class-D Audio Amplifier Simple Board
FIGURE 1-1 OVERVIEW OF AA-AB32131
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2*2W @4ΩPAM8803 Class-D Audio Amplifier Board
FIGURE 1-2 OVERVIEW OF AA-AB32133
FIGURE 1-1 ACCESSORY
Note: All the diagrams in this manual are for reference only.
1.2 Features
yA perfect “Class D” architecture
yFully-bridged stereo output
ypower supply:
AA-AB32131:
Wide power supply range: DC4.5V to12V via a power port
Two to three AA batteries or DC2.5V to 4.0V via a terminal block
AA-AB32133:
Two to three AA batteries or DC2.5V to 4.0V via a terminal block
yTwo kinds of input:
Line level input via 2510 connector
Audio input via 3.5 headphone jack
yFrequency response: 20Hz to 20KHz(±3dB)
ySignal/Noise Ratio: 85dB (f=22 to 22KHz, THD=1%)
yHigh Output Power
1.2W @ 8, < 10.0% THD+N
2.0W @ 4, < 10.0% THD+N
yHigh Efficiency
85% @ 1.2W 8
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Overview
88% @ 2.0W 4
yAudiophile Quality Sound
0.19% THD+N @ 0.5W 8
0.17% THD+N @ 1.0W 4
yVolume control:
Volume control buttons
External rotary encoder daughter board
yOver/under voltage turn off
yOver current protection
yOver temperature protection
1.3 Applications
yHome Active Speaker
yHome Theater Receiver
yMulti-channel Distribution
yActive DVD System
yMini/micro Systems
1.4 Benefits
yMounting holes facilitate installation and fixing
ySeveral wiring methods facilitate connection
yExcellent heat dissipation eliminate the requirement of an extra heat sink
yTactile switches for volume control are adjustable
1.5 Quick Start
Suggested connection is shown in figure 1-4 and figure 1-5.
FIGURE 1-4 CONNECTION (AA-AB32131)
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2*2W @4ΩPAM8803 Class-D Audio Amplifier Board
FIGURE 1-5 CONNECTION (AA-AB32133)
Note: Please observe the following steps to complete verification so as to ensure the
products are intact during transit.
1. Open the amplifier package and make sure the product is intact (No
missing or damaged components and no deformation)
2. Please observe the connection schematics when connecting the amplifier
board. Use a nearby sound source, such as MP3 or CD player to have a
trial. This amplifier board can be deemed as qualified if you can hear the
sound corresponding to that sound source.
3. Ensuring the long life time, load connection is recommended before the
power is turned on.
4. GND should be grounded or connected to the housing of the device.
5. The mounting holes of this product should be grounded.
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2*2W @4ΩPAM8803 CLASS-D
AUDIO AMPLIFIER BOARD
USER’S GUIDE
©2004-2010 Sure Electronics Inc.
Chapter 2. Hardware Detail
2.1 Power Connection
To power the amplifier board, use either jack or terminal blocks. On-board diodes can
prevent the consequence of wrong connection of power supply.
FIGURE 2-1 POWER CONNECTION (AA-AB32131)
FIGURE 2-2 POWER CONNECTION (AA-AB32133)
TABLE 2-1 POWER PORT
Connector Mark Description
Jack (AA-AB32131) J9 DC 4 to 12 power supply
Vbatt The positive of 2 to 3 AA batteries
Terminal Blocks
(AA-AB32131,
AA-AB32133)
J1 GND The negative of 2 to 3 AA batteries
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2*2W @4ΩPAM8803 Class-D Audio Amplifier Board
Note:
1. You are allowed to use only one way to power the amplifier board at a time.
2. The maximum supply voltage shall not exceed 14V.
3. One less than 6V battery or more connected in series can be used to power the
board. The minimum limited number is 2 AA batteries.
2.2 Input Connection
You may use 3.5mm headphone jack for audio signal input or use 2510 socket’s
mounting holes for line level audio input.
FIGURE 2-3 INPUT CONNECTION (AA-AB32131)
FIGURE 2-4 INPUT CONNECTION (AA-AB32133)
TABLE 2-2 INPUT PORT
Connector Mark Description
Lin Left Channel Input
GND GND
Mounting Holes (J4)
Rin Right Channel Input
3.5mm Headphone Jack J7 Left and Right Channel Input
Note: You are allowed to feed only one group (dual channel) of audio signal to the
amplifier board at a time.
2.3 Output Connections
You may use either terminal blocks for audio signal output or use mounting holes when
this board is used as a daughter board.
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Hardware Detail
FIGURE 2-5 OUTPUT CONNECTION (AA-AB32131)
FIGURE 2-6 OUTPUT CONNECTION (AA-AB32133)
TABLE 2-3 OUTPUT PORT
Connector Mark Description
LOUT+ Positive Output of Left Channel
LOUT- Negative Output of Left Channel
ROUT+ Negative Output of Right Channel
Mounting holes (J8)
ROUT- Positive Output of Right Channel
J2 Output of Left Channel
Terminal Blocks* J3 Output of Right Channel
Note:
1. Never connect more than one group of speaker to the audio output.
2. * Refer to on-board descriptions for connection details.
2.4 Mute Settings
The hole for MUTE is reserved on the board. To mute the output audio signal, connect
“GND” and “MUTE” of the terminal block with a piece of lead. Usually, “MUTE” shall be
left unconnected.
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2*2W @4ΩPAM8803 Class-D Audio Amplifier Board
FIGURE 2-7 MUTE SETTINGS (AA-AB32131)
FIGURE 2-8 MUTE SETTINGS (AA-AB32133)
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Hardware Detail
TABLE 2-4 MUTE SETTINGS
Connector Mark Description
J6
When “MUTE” is connected with “GND”, both channels will be
muted and enter into idle mode. When connected with high level
or left unconnected, both channels will resume regular operation.
MUTE
Note: Never connect MUTE to any power supply or voltage higher than +5V.
2.5 Sleep Settings
Two kinds of connection and installation are available: mounting holes and DIP switches.
To enable sleep settings, connect “GND” and “SHDN” of the terminal block with a piece
of lead. Usually, “SHDN” shall be left unconnected.
FIGURE 2-9 SLEEP SETTINGS (AA-AB32131)
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2*2W @4ΩPAM8803 Class-D Audio Amplifier Board
FIGURE 2-10 SLEEP SETTINGS (AA-AB32133)
TABLE 2-5 SLEEP SETTINGS
Connector Mark Description
J6
When “SHDN” is connected with “GND”, the chip will be set to
SLEEP and enter low-power-consumption working mode. When
“SHDN” is connected with high level or left unconnected, the chip
will resume regular operation.
SHDN
Settings of DIP switches are shown as follows.
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Hardware Detail
FIGURE 2-11 SETTINGS OF DIP SWITCHES (AA-AB32131)
FIGURE 2-12 SETTINGS OF DIP SWITCHES (AA-AB32133)
TABLE 2-6 SETTINGS OF DIP SWITCHES
SHDN Settings
K2 Function
ON Sleep mode
OFF Working mode
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2*2W @4ΩPAM8803 Class-D Audio Amplifier Board
Note: SLEEP means that the chip works with low power consumption. MUTE means
that the chip normally works with no output.
2.6 Volume Control Settings
On-board 2-slide DIP switches marked as “SW3” is used for volume control. K1 is used
to set volume and K2 used to set the SHDN of the chip.
FIGURE 2-13 VOLUME CONTROL SETTINGS (AA-AB32131)
TABLE 2-7 VOLUME CONTROL SETTINGS (AA-AB32131)
Volume Control Settings
K1 Function
ON Disable the tactile switches
OFF Enable the tactile switches for volume control
Note: When K1 is ON, the chip will amplify the audio signal with 4dB gain and the tactile
switches are disabled.
2.7 Volume Control
Two kinds of control input are provided to control volume: on-board tactile switches and
external rotary encoder control daughter board interface.
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Hardware Detail
FIGURE 2-14 VOLUME CONTROL (AA-AB32131)
TABLE 2-8 VOLUME CONTROL (AA-AB32131)
Connector Mark Description
SW1 UP Tactile Switch for Volume Increase
SW2 DOWN Tactile Switch for Volume Decrease
VDD 4.2V Voltage Output
GND GND
UP Volume Increase Input (Low Level Valid)
J5
DOWN Volume Decrease Input (Low Level Valid)
TABLE 2-9 CORRESPONDING GAIN OF EACH STEP OF VOLUME CONTROL
Step Gain(dB) Step Gain(dB) Step Gain(dB) Step Gain(dB)
1 -75.0 17 4.8 33 11.2 49 17.6
2 -39.7 18 5.1 34 11.6 50 18.0
3 -34.0 19 5.5 35 12.0 51 18.4
4 -28.2 20 5.9 36 12.3 52 18.8
5 -22.4 21 6.3 37 12.7 53 19.2
6 -16.5 22 6.7 38 13.2 54 19.6
7 -10.5 23 7.1 39 13.6 55 20.0
8 -8.0 24 7.5 40 14.0 56 20.4
9 -5.5 25 7.9 41 14.4 57 20.9
10 -2.9 26 8.3 42 14.8 58 21.3
11 -0.4 27 8.7 43 15.2 59 21.7
12 1.1 28 9.1 44 15.6 60 22.1
13 2.6 29 9.6 45 16.0 61 22.5
14 3.6 30 10.0 46 16.4 62 22.9
15 4.0 31 10.4 47 16.8 63 23.4
16 4.4 32 10.7 48 17.2 64 23.8
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2*2W @4ΩPAM8803 Class-D Audio Amplifier Board
©2004-2010 Sure Electronics Inc
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2.8 LED Indicator
This amplifier has one power LED indicator which is marked “Power (D4)”. The power
indicator will be illuminated in green when power-up. Please refer to the connection
schematic of the board for the LED location.
2.9 Notes
In order to protect amplifier board and extend its service lifetime, please read the
following warnings carefully since warranties will be voided if you do not observe the
following warnings:
Warning 1:
Quality-related issues caused by potentiometers installed by buyers.
Warning 2:
In order to achieve a better sound quality, please use stable power supply since a bad or
unstable power supply may worsen the sound quality or even cripple the amplifier board.
Warning 3:
Never equip a pre-amplifier to the audio input since the amplifier itself has powerful
amplification ability and a high signal input will burn out the amplifier chip.
Warning 4:
In order to protect amplifier and speaker, please turn the volume output to the minimum
when hooking up the amplifier and you may readjust the volume when you are sure that
the amplifier is functioning properly.

2*2W @4ΩPAM8803 CLASS-D
AUDIO AMPLIFIER BOARD
USER’S GUIDE
©2004-2010 Sure Electronics Inc.
Chapter 3. Electrical Characteristics
Following table lists all typical data. For full specification, please refer to the PAM’s data
sheet of PAM8803 chip.
TA=20 , f=1000Hz RL=4, f=1000Hz, Sine wave input, R℃L=4(unless otherwise
stated)
FIGURE 3-1 ELECTRICAL CHARACTERISTICS
Parameter Condition Min. Typ. Max.
AA-AB32131 - 4V - 12V
Supply Voltage AA-AB32131
AA-AB32133 - 2.5V - 4.5
DC12V, NO load - 100mA -
AA-AB32131
MUTE=0 - 10mA 40mA
2AA batt, NO load - 20mA -
Quiescent
Current
AA-AB32133
MUTE=0 - 10mA 20mA
Signal/Noise Ratio - - 85dB -
Input Sensitivity A=0dB - 0.720V -
RL=4, Pout=1W - 0.17 % -
THD+N*
RL=8, Pout=0.5W - 0.19 % -
Frequency Range - 20HZ to 20KHz (±3dB)
RL=4, Pout=2.6W - 88% -
Efficiency
RL=8, Pout=1.5W - 85% -
RL=4, f=1000Hz - 1.5W -
THD+N<1%
RL=8, f=1000Hz - 1.0W -
RL=4, f=1000Hz - 2.0W -
Output
Power
THD+N<10%
RL=8, f=1000Hz - 1.2W -
Input Impedance - - 60K -
Minimum Load - 3.2ohm - -
High-level input
voltage - 1.2V - -
SHUD, UP,
DOWM,
MUTE* Low-level input
voltage - - - 0.5V
Channel Separation* Po=1W, RL=4ohm 60dB 80dB -
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2*2W @4ΩPAM8803 Class-D Audio Amplifier Board
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Volume
Adjustable K1=OFF -75dB - 23.8dB
Power Gain* Volume not
adjustable K1=ON - 2.6dB -
Operating Temperature - 0℃20℃70℃
Storage Temperature - -20℃20℃105℃
Thermal Shutdown* - - 150℃-
Note: *The chip specifications from PAM’s PAM8803 Data Sheet.

2*2W @4ΩPAM8803 CLASS-D
AUDIO AMPLIFIER BOARD
USER’S GUIDE
©2004-2010 Sure Electronics Inc.
Chapter 4. Mechanical Drawing
FIGURE 4-1 MECHANICAL DRAWING
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