A PRODUCT LINE OF
DIODES INCORPORATED
2x3W Stereo Differential Input Class D Audio Amplifier
with Up/Down Volume Control
Description
The PAM8407 is a filter-less Class-D amplifier with high SNR and
differential input that helps eliminate noise. Advanced 32-step
Up/Down volume control minimizes external components and allows
speaker volume control.
The PAM8407 supports 2.5V to 6V operation make it idea for up to 4
cells alkaline battery applications.
Features like greater than 87% efficiency and small PCB area make
the PAM8407 Class-D amplifier ideal for portable applications. The
output uses a filter-less architecture minimizing the number of
external components and PCB area whilst providing a high
performance, simple and lower cost system.
The PAM8407 built in auto recovery SCP (short circuit protection) and
thermal shutdown.
The PAM8407 is available in SO-16 package.
PAM8407
Pin Assignments
SO-16
RINP
RINN
SD
UP
DOWN
GND
LINN
LINP
1
2
3
4
5
6
7
8
16
VDD
15
ROUTP
14
ROUTN
13
GND
12
GND
11
LOUTN
10
LOUTP
9
VDD
PAM8407
XX XY W WLL
New Product
Features
3W Output at 10% THD with a 4Ω load and 5V Supply
2.4W Output at 1% THD with a 4Ω Load and 5V Supply
2.5V to 6.0V VDD Operating
Fully Differential Input
Filterless, Low Quiescent Current and Low EMI
Low THD+N
32-stepUp/Down Volume Control from -80dB to 24dB
Superior Low Noise: 60uV
Minimize Pop/Clip Noise
Auto Recovery Short Circuit Protection
Thermal Shutdown
Pb-Free SO-16 Package
Applications
PC Speaker
Wireless Speaker
Home Sound Systems
Active Speakers
Docking stations
Typical Applications Circuit
RINP
RINN
SHDN
C5
0
.
1uF
C6
0
.
1uF
ON
1 RINP
2 RINN
3 SD
4 UP
5 DOWN
6 GND
VDD 16
ROUTP 15
ROUTN 14
4Ω
V
DD
C2
1uF
PAM8407
GND 13
GND 12
LOUTN 11
LOUTP 10
VDD 9
4Ω
C2
1uF
V
DD
C7
LINN
LINP
0
.
1uF
C8
0
.
1uF
7 LINN
8 LINP
PAM8407
Document number: DS36815 Rev. 1 - 2
1 of 12
www.diodes.com
January 2014
© Diodes Incorporated
A PRODUCT LINE OF
DIODES INCORPORATED
2x3W Stereo Differential Input Class D Audio Amplifier
with Up/Down Volume Control
PAM8407
Pin Descriptions
PIN Number
1
2
3
PIN Name
RINP
RINN
SD
UP
DOWN
GND
LINN
LINP
VDD
LOUTP
LOUTN
ROUTN
ROUTP
Description
Positive Input of Right Channel Power Amplifier.
Negative Input of Right Channel Power Amplifier.
Full Chip Shutdown Control Input (active low).
Volume UP Control (active low)Ground
Connection.
Volume down Control (active low)
Ground.
Negative Input of Left Channel Power Amplifier.
Positive Input of Left Channel Power Amplifier.
Power Supply.
Positive Output of Left Channel Power Amplifier.
Negative Output of Left Channel Power Amplifier.
Negative Output of Right Channel Power Amplifier.
Positive Output of Right Channel Power Amplifier.
New Product
4
5
6,12,13
7
8
9,16
10
11
14
15
Functional Block Diagram
V DD
GN D
R IN P
R IN N
VD D
A tte n u a ti o n D e c o d e r
I n t e rf a c e C o n t r o l
+
DRIVER
MODULATOR
Thermal
Protection
R OU T P
R OU T N
-
VD D
UP
VD D
INTERNAL
OSCILLATOR
BIAS
AND
REFERENCES
SD
DO WN
OSC
Current
Protection
+
LIN N
LIN P
MODULAT OR
-
D R IVER
LOU T N
LOU T P
VDD
GND
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
Parameter
Supply Voltage (VDD)
Pins Input Voltage (SD, UP, Down, IN)
Storage Temperature
Maximum Junction Temperature
Junction to ambient thermal resistance
6.5
-0.3 to VDD+0.3
-65 to +150
+150
40
2 of 12
www.diodes.com
Rating
Unit
V
V
°C
°C
°C/W
January 2014
© Diodes Incorporated
PAM8407
Document number: DS36815 Rev. 1 - 2
A PRODUCT LINE OF
DIODES INCORPORATED
2x3W Stereo Differential Input Class D Audio Amplifier
with Up/Down Volume Control
PAM8407
Recommended Operating Conditions
(@T
A
= +25°C, unless otherwise specified.)
Symbol
V
DD
T
A
T
J
Parameter
Supply Voltage
Operating Ambient Temperature Range
Junction Temperature Range
Min
2.5
-40
-40
Max
6.0
+85
+125
Unit
V
°C
°C
New Product
Electrical Characteristics
(@
TA=25°C, VDD=5.0V, Gain=24dB, RL=8Ω (33μH)+R+L(33μH), unless otherwise noted.
)
PARAMETER
Supply Voltage Range
Quiescent Current
Output Offset Voltage
Drain-Source On-State
Resistance
SYMBOL
V
DD
I
Q
V
OS
R
DS(ON)
—
No Load
No Load
P MOSFET
I
DS
= 0.5A
N MOSFET
R
L
= 8Ω
R
L
= 4Ω
CONDITIONS
MIN
2.5
—
—
—
—
—
—
—
—
—
—
200
—
—
—
—
—
—
—
—
1.4
—
—
—
TYP
—
8
10
0.3
0.2
1.4
2.4
0.08
0.08
70
-95
250
87
83
60
80
95
0.65
4
—
—
—
150
40
MAX
5.5
—
—
—
Ω
—
—
W
—
—
%
—
—
—
300
—
—
—
μV
No A-weighting
—
—
—
10
1
—
0.6
—
—
dB
S
mA
µA
V
V
°C
°C
dB
dB
kHz
%
%
UNITS
V
mA
mV
Output Power
P
O
THD+N = 1%,
f = 1kHz
Total Harmonic Distortion Plus
Noise
Power Supply Ripple Rejection
Channel Separation
Oscillator Frequency
Efficiency
THD+N
PSRR
CS
f
OSC
η
R
L
= 8Ω，P
O
= 0.85W, f = 1KHz
R
L
= 4Ω，P
O
= 1.75W, f = 1KHz
Input AC-GND, f = 1KHz, Vpp = 200mV
P
O
= 1W, f = 1KHz
—
P
O
= 1.1W,f = 1kHz, R
L
= 8Ω
P
O
= 2.4W,f = 1kHz, R
L
= 4Ω
Noise
Signal Noise Ratio
Turn-on Time
Mute Current
Shutdown Current
Logic Input High
Logic Input Low
Over Temperature Protection
Over Temperature Hysteresis
Vn
SNR
Ton
I
MUTE
I
SD
V
IH
V
IL
OTP
OTH
Input
AC-GND
f = 20-20kHz, THD = 1%
VDD = 5V
MUTE = VDD
V
SD
= 0V
Include SD, UP, DOWN
Include SD, UP, DOWN
—
—
A-weighting
PAM8407
Document number: DS36815 Rev. 1 - 2
3 of 12
www.diodes.com
January 2014
© Diodes Incorporated
A PRODUCT LINE OF
DIODES INCORPORATED
2x3W Stereo Differential Input Class D Audio Amplifier
with Up/Down Volume Control
PAM8407
Performance Characteristics
(@
T
A
= +25°C, V
DD
= 5V, Gain = 24dB, R
L
= L(33μH) + R + L(33μH), unless otherwise noted.
)
THD+N Vs. Output Power (RL=8Ω)
20
10
5
40
THD+N Vs. Output Power (RL=4Ω)
f=100Hz/1kHz/10kHz
(Red/Pink/Blue)
20
10
5
f=100Hz/1kHz/10kHz
(Red/Pink/Blue)
2
New Product
2
1
1
%
0.5
%
0.5
0.2
0.2
0.1
0.05
0.1
0.05
0.02
0.01
1m
0.02
0.01
1m
2m
5m
10m
20m
50m
W
100m
200m
500m
1
2
2m
5m
10m
20m
50m
W
100m
200m
500m
1
2
THD+N Vs. Frequency (RL=8Ω)
10
5
10
5
THD+N Vs. Frequency (RL=4Ω)
2
PO=0.3W/0.5W/1W
(Red/Pink/Blue)
PO=0.5W/1W/2W
(Red/Pink/Blue)
2
1
1
0.5
%
0.2
%
0.5
0.2
0.1
0.1
0.05
0.05
0.02
0.02
0.008
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
0.01
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
PSRR Vs. Frequency
+0
-5
-10
-15
-20
-25
-30
-35
d
B
-40
-45
-50
-55
-60
-65
-70
-75
-80
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
-100
-110
-120
-130
-140
20
d
B
-40
-50
-60
-70
-80
-90
+0
-10
-20
-30
Crosstalk Vs Frequency
T
L to R
R to L
50
100
200
500
Hz
1k
2k
5k
10k
20k
PAM8407
Document number: DS36815 Rev. 1 - 2
4 of 12
www.diodes.com
January 2014
© Diodes Incorporated
A PRODUCT LINE OF
DIODES INCORPORATED
2x3W Stereo Differential Input Class D Audio Amplifier
with Up/Down Volume Control
PAM8407
Performance Characteristics
(@
T
A
= +25°C, V
DD
= 5V, Gain = 24dB, R
L
= L(33μH) + R + L(33μH), unless otherwise noted.
)
Frequency Response
+16
Noise Floor
+0
+14
Cin=0.47uF
Cin=1uF
-10
-20
-30
+12
-40
New Product
+10
d
B
g
A
+6
-50
+8
Cin=0.1uF
d
B
r
A
-60
-70
-80
-90
-100
+4
-110
-120
-130
+2
+0
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
-140
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
Efficiency Vs. Output Power (RL=8Ω)
Efficiency Vs. Output Power (RL=4Ω)
100
80
100
80
Efficiency(%)
40
20
0
VDD=5V
Efficiency(%)
40
20
0
60
60
VDD=5V
0
200 400 600 800 10001200140016001800
Output Power(mW)
0
1000
Output Power(mW)
4000
2000
3000
Output Power Vs. Supply Voltage (RL=8Ω, THD=10%)
Output Power Vs. Supply Voltage(RL=4Ω,THD=10%)
2500
2000
1500
1000
500
0
2
3
4
5
Input Voltage(V)
6
4000
Output Power(mW)
2000
1000
0
2
3
4
5
Input Voltage(V)
6
PAM8407
Document number: DS36815 Rev. 1 - 2
5 of 12
www.diodes.com
Output Power(mW)
3000
January 2014
© Diodes Incorporated
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