Diodes PAM8008 User Manual
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Description
The PAM8008 is a 3W, Class-D audio amplifier. Advanced 64-step
DC volume control minimizes external components and allows
speaker volume control.
Integrated power limit technology which suppress the output signal
clip automatically due to the over level input signal. It offers low
THD+N and protect speaker.
Integrated anti-saturation technology which suppress the output
signal clip automatically when supply voltage changes. It offers low
THD+N, to produce high-quality sound reproduction.
PAM8008 has an additional noise reduction circuit which achieves
6dB noise attenuation. This circuit may help eliminate external
filtering, thereby saving the board space and components cost.
The PAM8008 features SCP (short circuit protection), OTP and
thermal shutdown.
The PAM8008 is available in SOP-16L package.
Features
• 3W Output at 10% THD with a 4 Load and 5V Power Supply
• 2.4W Output at 1% THD with a 4 Load and 5V Power Supply
• Filterless, Low Quiescent Current and Low EMI
• Low THD+N
• Power Limit Function to Protect Speaker when Occuring Large
Input
• 64-Step DC Volume Control from -80dB to +20dB
• 6dB Effective Noise Reduction
• Superior Low Noise: 60µV
• Minimize Pop/Clip Noise
• High Efficiency Up to 90%
• Auto Recovery Short Circuit Protection
• Thermal Shutdown
• Pb-Free Package
PAM8008
Document number: DSxxxxx Rev. 1 - 0
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3W STEREO CLASS-D with DC VOLUME,
POWER LIMIT and ANTI-SATURATION
Pin Assignments
Applications
• LCD Monitors / TV Projectors
• Notebook/All-In-One Computers
• Portable Speakers
• Portable DVD Players, Game Machines
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PAM8008
© Diodes Incorporated
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Typical Applications Circuit
Pin Descriptions
Pin
Number
1 SD
2 BYPASS
3 RINN
4 PL
5, 12, 13 GND
6 LINN
7 VOLUME
8 MUTE
9 LOUTP
10, 15 VDD
11 LOUTN
14 ROUTN
16 ROUTP
PAM8008
Document number: DSxxxxx Rev. 1 - 0
Pin
Name
Full Chip ShutdownControl Input (active low).
Bias Voltage for Power Amplifiers.
Negative Input of Right Channel Power Amplifier.
Connect PL to GND for Power Limit Setting.
Ground Connection.
Negative Input of Left Channel Power Amplifier.
DC Volume Control to Set the Gain of Class-D.
Mute Control Input (active high).
Positive Output of Left Channel Power Amplifier.
Power Supply.
Negative Output of Lef t Channel Power Amplifier.
Negative Output of Right Channel Power Amplifier.
Positive Output of Right Channel Power Amplifier.
Function
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PAM8008
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Functional Block Diagram
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PAM8008
Absolute Maximum Ratings (@T
These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may
affect device reliability. All voltages are with respect to ground.
Parameter Rating Unit
Supply Voltage 6.0
Input Voltage
Operational Junction Temperature -40 to +125
Storage Temperature -65 to +150
Soldering Temperature 300, 5 sec
Recommended Operating Conditions (@T
Parameter Rating Unit
Supply Voltage Range 2.5 to 5.5 V
Ambient OperationTemperature Range -20 to +85
Junction Temperature Range -20 to +125
= +25°C, unless otherwise specified.)
A
-0.3 to V
DD
+0.3
= +25°C, unless otherwise specified.)
A
V
°C
°C
Thermal Information
Parameter Package Symbol Max Unit
Thermal Resistance (Junction to Ambient) SOP-16L
Thermal Resistance (Junction to Case) SOP-16L
PAM8008
Document number: DSxxxxx Rev. 1 - 0
θ
JA
θ
JC
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110
23
°C/W
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PAM8008
Electrical Characteristics (@T
Parameter Symbol Test Conditions Min Typ Max Units
Supply Voltage Range
Quiescent Current
Output Offset Voltage
Drain-Source On-State Resistance
Output Power
Total Harmonic Distortion Plus Noise THD+N
Power Supply Ripple Rejection PSRR
Channel Separation CS
Oscillator Frequency
Efficiency η
Noise
Signal Noise Ratio SNR f = 20 - 20kHz, THD = 1% 95 dB
Turn-On Time
Mute Current
Shutdown Current
Logic Input High
Logic Input Low
Over Temperature Protection OTP 150 °C
Over Temperature Hysteresis OTH 40 °C
PAM8008
Document number: DSxxxxx Rev. 1 - 0
= +25°C, VDD = 5V, Gain = Maximum, RL = 8Ω, unless otherwise specified.)
A
V
DD
I
Q
V
OS
R
IDS = 0.5A
DS(ON)
P
O
f
OSC
V
N
T
VDD = 5V, C
ON
I
MUTE = VDD
MUTE
I
VSD = 0V
SD
V
IH
V
IL
No Load
No Load 10 mV
P MOSFET 0.31
N MOSFET 0.21
= 8Ω
THD+N = 1%
f = 1kHz
R
= 8Ω, PO = 0.85W, f = 1KHz
L
R
L
RL = 4Ω
RL = 4Ω, PO = 1.75, f = 1KHz
Input AC-GND, f = 1KHz, V
P
= 1W, f = 1KHz
O
= 200mV
PP
200 250 300 kHz
P
= 1.1W, f =1 kHz, RL = 8Ω
O
PO = 2.4W, f =1 kHz, RL = 4Ω
Input AC-GND
BYP
A-Weighting 60
No A-Weighting 80
= 1µF
1.4
0.6
2.5 5.5 V
8 mA
1.4
2.4
0.08
0.08
70 dB
-95 dB
87 %
83 %
1.2 S
4 10 mA
1 µA
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Ω
W
%
µV
V
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Typical Performance Characteristics (@T
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PAM8008
= +25°C, VDD = 5V, GV = 20dB, RL = 8Ω, unless otherwise specified.)
A
PAM8008
Document number: DSxxxxx Rev. 1 - 0
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