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6 X 100Watt Class-D Audio
Amplifier Board- TDA7498
User’s Guide
© 2004-2012 Sure Electronics Inc. AA-AB34181_Ver1.0
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6 X 100W att Class-D Audio Amplifier Board – TDA7498
To keep the product in a best working condition and having a long service time, please operate it according to
the relevant steps. The warranty lapses if the product is damaged because of incorrect use and your
negligence.
Please read this manual carefully before you use the product and check if the product is a good one. DC36V
is recommended to be used to power the product for one hour. Please make sure there’s space for heat
dissipation since this product outputs high power an d don’t touch the heat sin k with your hand. Never use this
product in an extreme condition.
Warning: Never immerse the product in the rain or any other humid environment to prevent the fire or
electric shock.
Safety Precautions:
1. 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.
2. Avoid metal objects
Protect this product well and move away metal objects from this product.
© 2004-2012 Sure Electronics Inc. AA-AB34181_Ver1.0
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6 X 100WATT CLASS-D AUDIO
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AMPLIFIER BOARD– TDA7498
USER’S GUIDE
Table of Contents
Chapter 1. Overview ..........................................................................................................1
1.1 Overview..............................................................................................................1
1.2 Accessories......................................................................................................... 1
1.3 Features............................................................................................................... 1
1.4 Applications......................................................................................................... 2
1.5 Benefits................................................................................................................ 2
1.6 Quick Start........................................................................................................... 2
Chapter 2. Hardware Detail...............................................................................................3
2.1 Power Connection............................................................................................... 3
2.2 Input Connection................................................................................................. 3
2.3 Output Connection.............................................................................................. 4
2.4 LED Indicators.....................................................................................................5
2.5 Volume Control.................................................................................................... 5
2.6 Mode Selection....................................................................................................6
2.7 Notes.................................................................................................................... 7
Chapter 3. Electrical Characteristics ...............................................................................8
Chapter 4. Mechanical Drawing........................................................................................9
Chapter 5. Contact Us .....................................................................................................10
© 2004-2012 Sure Electronics Inc.
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6 X 100W att Class-D Audio Amplifier Board– TDA7498
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NOTES:
Product Version ： Ver 1.4
Document Version ： Ver 1.0
A-AB34181_Ver1.0_Page ii
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1.1 Overview
6 X 100WATT CLASS-D AUDIO
AMPLIFIER BOARD– TDA7498
USER’S GUIDE
Chapter 1. Overview
Welcome to use this self-made 6*100W audio amplifier board which is a perfect class-D
architecture integrated TDA7498 chip to achieve the single-channel 100W power output.
With high efficiency, it especially is available for the outdoo r venues whe re po wer supply
is always in consideration.
Resistance and capacity components of high quality, including X7R ceramic capacitors
and lower ESR electrolytic capacitors, are used to gain the perfect timber, finally realize
high S/N ratio, low THD+N, wide frequency response range etc.
Briefly , the po wer su pply range and heat sink perform ance of ea ch p roduct di stinguishes.
You may make the proper choice to meet your application needs.
FIGURE 1-1 OVERVIEW
1.2 Accessories
We don’t provide audio accessories together with this product. Please go to
www.sure-electronics.com
to choose what you need.
1.3 Features
y A perfect "Class D" architect ure
y Frequency response: 20Hz to 20KHz(±3dB)
y Four selectable, fixed gain settings of nominally 25.6 dB, 31.6 dB, 35.1 dB and 37.6
dB.
y Single end audio signal input
y Over/under voltage protection
y Over current protection
y Over tempera ture protection
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1.4 Applications
y Background Music Systems
y Vending Machines
y Lifts
y Interactive Kiosks
y Home DIY
y Car audio
1.5 Benefits
y Mounting holes facilitate installation and fixing
y Several wiring methods facilitate connection： RCA Socket (Default),Terminal
Block(Optional)
y Excellent design of the power ports which allows you to connect multiple amplifier
boards in series (Terminal Block Optional).
y Excellent heat dissipation eliminates the requirement of an extra heat sink.
1.6 Quick Start
Suggested connection is shown in figure 1-3.
FIGURE 1-3 CONNECTION SCHEMATIC
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
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2.1 Power Connection
A high-performance power supply is important for an amplifier to output high-quality
sound and work stably.
To power the amplifier board, use either jack J12 or terminal blocks J13(optional). Pay
attention to the polarity when connecting power supply. Please connect the power
adapter with the audio power amplifier according to the following schematic:
FIGURE 2-1 POWER CONNECTION SCHEMATIC
6 X 100WATT CLASS-D AUDIO
AMPLIFIER BOARD– TDA7498
USER’S GUIDE
Chapter 2. Hardware Detail
2.2 Input Connection
You may use RCA connectors to input audio signal.
FIGURE 2-3 INPUT CONNECTION
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TABLE 2-1 INPUT CONNECTION
Connector Mark Channel Description
RCA Conne ctor
Terminal Blocks（Optional）
Warning:
1. For each group (dual channels), RCA and Terminal Blocks can not be used as
2. Never plug in or unplug RCA connectors when the amplifier is powered. Or the
2.3 Output Connection
You can use either terminal blocks or banana connectors (optional) to output audio
signal.
FIGURE 2-4 OUTPUT CONNECTION
J6 Channel 1 Input
J7 Channel 2 Input
J8 Channel 3 Input
J9 Channel 4 Input
J10 Channel 5 Input
J11 Channel 6 Input
Channel 1 Input
J1
GND
GND
J2
Channel 2 Input
Channel 3 Input
J3
Channel 4 Input
Channel 5 Input
J4
GND
GND
J5
Channel 6 Input
input connectors at the same time.
amplifier will be damaged permanently.
Hardware Detail
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TABLE 2-2 OUTPUT CONNECTION
Connector Mark Description
J21 Positive Output of Channel 1
J22 Negative Output of Channel 1
J23 Positive Output of Channel 2
J24 Negative Output of Channel 2
J25 Positive Output of Channel 3
Banana Connectors
Terminal Blocks*
Note:
1. Never connect more than one group of speaker to the audio output
2. Never connect CH1_OUT-, CH2_OUT-, CH3_OUT-, CH4_OUT-, CH5_OUT-,
CH6_OUT- together since they belong to different NETs.
3. Refer to on-board descriptions for connection details.
2.4 LED Indicators
This amplifier has one power LED indicator which is marked as Power Indicator (D1).
Power Indicator (D1) will be illuminated in green when power-up.
FIGURE 2-4 LED INDICATOR
J26 Negative Output of Channel 3
J27 Positive Output of Channel 4
J28 Negative Output of Channel 4
J29 Positive Output of Channel 5
J30 Negative Output of Channel 5
J31 Positive Output of Channel 6
J32 Negative Output of Channel 6
J15 Output of Channel 1
J16 Output of Channel 2
J17 Output of Channel 3
J18 Output of Channel 4
J19 Output of Channel 5
J20 Output of Channel 6
2.5 Volume Control
K1 and K2 of SW1, SW2 and SW3 have been factory preset as ON to make sure weak
gain of three channels. This can prevent chip from permanent damage caused by
overheat when input signal amplitude is over range. On the other conditions of gain
setting, it is recommended that the output signal amplitude is no larger than the power
supply voltage once the input signal reaches the peak.
For example, the maximum amplitude of the input signal is no more than 323mV RMS
when power supply voltage is 36V, load impedance is 6 ohm and the gain is set at 37.6
dB. The other circumstances can be referred to the input sensitivity from TAB L E 3 -1
ELECTRICAL CHARACTERISTICS.
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FIGURE 2-5 VOLUME CONTROL
Hardware Detail
TABLE 2-3 DIP SWITCH SW1/SW2/SW3 SETTING
Switch K1 K2 Gain Status(dB)
SW1/SW2/SW3
2.6 Mode Selection
The three operation modes of this board are set by the DIP switch SW4.
y Standby mode: all circuits are turned off, very low current consumption.
y Mute mode: inputs are connected to ground and the positive and negative PWM
y Play mode: the amplifiers are active.
FIGURE 2-6 MODE SELECTION
ON ON Weak
OFF ON Low
ON OFF Medium
OFF OFF High
outputs are at 50% duty cycle.
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TABLE 2-4 DIP SWITCH SW4 SETTING
Switch K1 K2 Mode
X (don’t care) ON Standby
SW4
2.7 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 o r
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.
ON OFF Mute
OFF OFF Play
© 2004-2012 Sure Electronics Inc.
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6 X 100WATT CLASS-D AUDIO
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AMPLIFIER BOARD– TDA7498
USER’S GUIDE
Chapter 3. Electrical Characteristics
Following table lists all typical data of the Amp board. For full specification, please refer
to the data sheet of ST’s TDA7498 chip.
TABLE 3-1 BASIC PARAMETERS
Parameter Condition Min. Typ. Max.
Supply Voltage - 14V 36V 39V
25.6dB 1286mV
Input Sensitivity
Gain(SW1/SW2/SW3
Setting)
31.6dB 723mV
35.1dB 430mV
37.6 dB
K1 ON, K2 ON 24.6 25.6 26.6
K1 OFF, K2 ON 30.6 31.6 32.6
K1 ON, K2 OFF 34.1 35.1 36.1
K1 OFF, K2 OFF 36.6 37.6 38.6
323mV
-
Gain matching - -1 - 1
Frequency Range Efficiency P=100W+100W - 90% -
Input Impedance - 48K ohm 60K ohm -
Power Transistor on
Resistance
Over Voltage Protection
threshold
Under Voltage Protection
threshold
Over Current Protection
threshold
Load - - 6 ohm Operating Temperature - 0℃ 20℃ 50℃
Storage Temperature - -20℃ 20℃ 105℃
High side - 0.2 ohm Low side - 0.2 ohm -
- 42V 43v -
- - - 8V
R=0 ohm 5.5A 7A -
20Hz to 20KHz（±3dB）
Thermal Shutdown - - 150℃ -
Note:
1. Stresses beyond the listed maximum power supply voltage may cause the
permanent damage to components on board.
2. The input sensitivity values are calculated on the basis of 6 Ohm load.
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© 2004-2012 Sure Electronics Inc.
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6 X 100WATT CLASS-D AUDIO
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AMPLIFIER BOARD– TDA7498
USER’S GUIDE
Chapter 4. Mechanical Drawing
FIGURE 4-1 MECHANICAL DRAWING
© 2004-2012 Sure Electronics Inc.
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6 X 100WATT CLASS-D AUDIO
A
AMPLIFIER BOARD– TDA7498
USER’S GUIDE
Chapter 5. Contact Us
Sure Electronics Co., Ltd.
East zone, 3F, Building 6
Jingang Technology Innovation Center
No.108 Ganjiabian Rd (ZIP: 210000)
Qixia District
Nanjing
P.R.China
Tel: +86-25-68154800-860
Fax: +86-25-68154891-832
Website: www.sure-electronics.com
Email: customerservice@sure-electronics.com
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© 2004-2012 Sure Electronics Inc.
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