PAM8007
Filterless 3W Class-D Stereo Audio Amplifier
with DC Volume Control and Headphone Output
Key Features
n
3W Output at 10% THD with a 4
Ω
Load and
5V Power Supply
n
Filterless, Low Quiescent Current and Low
EMI
n
Low THD+N
n
64-step DC Volume Control
n
Headphone Output Function
n
Superior Low Noise
n
Low pop noise
n
Efficiency up to 92%
n
Short Circuit Protection
n
Thermal Shutdown
n
Few External Components to Save the
Space and Cost
n
Pb-Free Package
General Description
The PAM8007 is a 3W, class-D audio amplifier
with headphone amplifier. Advanced 64-step DC
volume control minimizes external components
and allows speaker volume control and
headphone volume control. It offers low THD+N,
to produce high-quality sound reproduction. The
new filterless architecture allows the device to
drive the speaker directly, without low-pass output
filters
,
which will save 30% system cost and 75%
PCB area.
With the same numbers of external components,
the efficiency of the PAM8007 is muc h better than
class-AB cousins. It can extend the battery life
thus be ideal for portable ap plications.
The PAM8007 is available in a SSOP-24 and SOP-
24 package.
Applications
n
n
n
n
n
LCD Monitors / TV Projectors
Notebook Computers
Portable Speakers
Portable DVD Players, Game Machines
VoIP/Speaker Phones
Typical Application
PVDDL
10
μ
F
1
μ
F
5
0.47
μ
F
2
PGNDL
3
PGNDL
+OUTL
4
PVDDL
8
9
INL
EarInL
INL
0.47
μ
F
-OUTL
-
1
INR
0.47
μ
F
17
0.47
μ
F
INR
EarInR
+OUTR
21
16
24
-OUTR
-
ON
SHDN
ON
MUTE
DC Volume
VDD
1
μ
F
19
6
SHDN
MUTE
PAM8007
13
EarOutR
220
μ
F
220
μ
F
+
+
-
-
11
7
10
V OLUME
12
VDD
VDC
15
Line/Ear
VREF
PVDDR
20
PGNDR PGNDR
22
23
1
μ
F
10
μ
F
Headphone
EarOutL
1
μ
F
14
GND
18
H: Headphone
L: Class D
(de
fault)
Power Analog Microelectronics
,
Inc
www.poweranalog.com
1
01/2012 Rev1.2
PAM8007
Filterless 3W Class-D Stereo Audio Amplifier
with DC Volume Control and Headphone Output
Block Diagram
VDD
PVDD PGND
EarInR
VDD/2
Headphone
EarOutR
+
+
INR
-
-
DRIVER
MODULATOR
+OUT_R
-OUT_R
Thermal
Protection
VDC
MUTE
SHDN
LINE/EAR
VOLUME
OSC
Current
Protection
INTERNAL
OSCILLATOR
BIAS
AND
REFERENCES
VREF
MODULATOR
+OUT_L
DRIVER
INL
VDD/2
-
+
-
+
-OUT_L
EarInL
Headphone
EarOutL
GND
PVDD
PGND
Pin Configuration & Marking Information
SSOP24
Top View
-OUT_L
1
2
3
4
5
6
24
-OUT_R
23
22
21
20
19
18
17
16
15
14
13
SOP24
Top View
-OUT_L
PGNDL
PGNDL
+OUT_L
PVDDL
MUTE
VDD
7
INL
8
EarInL
9
VDC
10
VOLUME
11
EarOutL
12
PGNDR
PGNDR
+OUT_R
PVDDR
SHDN
GND
INR
EarInR
LINE/EAR
VREF
EarOutR
PGNDL
PGNDL
3
+OUT_L
4
PVDDL
5
MUTE
6
VDD
7
INL
8
EarInL
9
VDC
10
VOLUME
11
EarOutL
12
1
2
24
-OUT_R
23
22
21
20
19
18
17
16
15
14
13
PGNDR
PGNDR
+OUT_R
PVDDR
SHDN
GND
INR
EarInR
LINE/EAR
VREF
EarOutR
X: Internal Code
Y: Year
WW: Week
LL: Internal Code
Power Analog Microelectronics
,
Inc
www.poweranalog.com
2
01/2012 Rev1.2
PAM8007
Filterless 3W Class-D Stereo Audio Amplifier
with DC Volume Control and Headphone Output
Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Pin Name
- OUT_L
PGNDL
PGNDL
+OUT_L
PVDDL
MUTE
VDD
INL
Ear InL
VDC
V OLUME
EarOutL
EarOutR
VREF
LINE/EAR
EarInR
INR
GND
SHDN
PVDDR
+OUT_R
PGNDR
PGNDR
-OUT_R
Left Channel Nega tive Ou tput
Left Channel Power GND
Left Channel Power GND
Left Channel Posi tive Ou tput
Left Channel Power Sup ply
Mute Contr ol Input(active low)
Anal og VDD
Left Channel Inpu t
Left Earpho ne inp ut
Anal og reference for gain control sectio n
DC volume control to set the ga in of Class-D
Left Earpho ne output(Non -Inverting)
Right Earph one ou tput(Non-In verting)
Inter nal ana log reference, connect a b ypass capacitor fr om VREF to GND
Line / earph one S witch.sp eaker output(active low),Ea rphone outpu t(active high)
Right Earph one in put
Right Channel Inp ut
Anal og GND
Shutdown Control Input(active l ow)
Right Channel Power Sup ply
Right Channel Positive Output
Right Channel Power GND
Right Channel Power GND
Right Channel Ne gative Output
Desc ription
Absolute Maximum Ratings
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
.
Supply Voltage ............................................6.0V
Storage Temperature.....................-65° to 150 °
C
C
Input Voltage.............................-0.3V to V
DD
+0.3V
Soldering Temperature....................... 300°
C,5sec
Maximun Junction Temperature...................150°
C
Recommended Operating Conditions
Supply Voltage Range....................... 2.5V to 5.5V
Junction Temperature Rang...........-20 ° to 125 °
C
C
Ambient Operation Temperature
Range............................................-20 ° to 85 °
C
C
Package
SSOP-2 4
SOP-24
SSOP-2 4
SOP-24
Maximum
96
79.2
32
27
Unit
°
C/W
°
C/W
°
C/W
°
C/W
Thermal Information
Parameter
Thermal Re sistance (Junction to Ambient)
Thermal Re sistance (Junction to Ambient)
Thermal Re sistance (Junction to Ambient)
Thermal Re sistance (Junction to Ambient)
Symbol
θ
JA
θ
JA
θ
JC
θ
JC
Power Analog Microelectronics
,
Inc
www.poweranalog.com
3
01/2012 Rev1.2
PAM8007
Filterless 3W Class-D Stereo Audio Amplifier
with DC Volume Control and Headphone Output
Electrical Characteristic
V
DD
=5V, Gain = 24dB, R
L
=8
Ω,
T
A
=25° unless otherwise noted.
C,
PARAMETER
Class D Stage
Supply Voltage Range
Quiescent Current
Output Offset Voltage
Drain-Source On-State Resistance
Output Power
SYMBOL CONDITIONS
V
DD
I
Q
V
OS
R
DS(ON)
P
O
No Load
No Load
I
DS
=0.5A
THD+N=10%,
f=1kHz
P MOSFET
N MOSFET
MIN
2.5
TYP
MAX
5.5
UNITS
V
mA
mV
Ω
W
%
dB
dB
12
10
0.23
0.17
1.55
2.85
1.75
3.1
0.12
0.15
63
-88
200
250
92
88
65
90
84
69
0.04
73
95
19
25
97
8
1.5
16
50
R
L
= 8Ω
R
L
= 4Ω
Total Harmonic Distortion Plus Noise THD+ N
Power Supply Ripple Rejection
PSRR
CS
f
OSC
η
Vn
SNR
P
O
PSRR
CS
Vn
SNR
I
MUTE
I
SHDN
V
SH
V
SL
V
MH
V
ML
V
DH
V
DL
OTP
OTH
R
L
=8Ω, P
O
=1W,f=1KHz
R
L
=4Ω, P
O
=2W,f=1KHz
Input AC-GND, f=1KHz, Vpp=200mV
Channel Separation
Oscillator Frequency
Efficiency
Noise
Signal Noise Ratio
Earphone Stage
Output Power
Power Supply Ripple Rejection
Vo=1Vrms
, f=1KHz
P
O
=1.75W,f=1kHz,
R
L
=8Ω
P
O
=3.0W,f=1kHz,
R
L
=4Ω
Input AC-GND
Gain=12dB
A-weighting
No A-weighting
85
80
300
kHz
%
%
uV
dB
mW
%
dB
dB
uV
dB
f=20-20kHz, THD=1%
THD+N=1%,
R
L
=32Ω, f=1kHz
Total Harmonic Distortion Plus Noise THD+ N
R
L
=32Ω, P
O
=10mW, f=1kHz
Input AC-GND, f=1kHz, Vpp=2 00mV
Channel Separation
Noise
Signal Noise Ratio
Control Section
Mute Current
Shutdown Current
SHDN Input High
SHDN Input Low
MUTE Input High
MUTE Input Low
Line/Ear Input High
Line/Ear Input Low
Over Temperature Protection
Over Temperature Hysteresis
Vo=1Vrms
, f=1kHz
Input
AC-GND
A-weig hting
No A-weighting
f=20-20kHz, THD=1%
V
MUT E
= 0V
V
SHDN
= 0V
12
20
0.4
mA
µA
V
V
V
°
C
°
C
1.5
0.4
2.5
0.4
150
30
Power Analog Microelectronics
,
Inc
www.poweranalog.com
4
01/2012 Rev1.2
PAM8007
Filterless 3W Class-D Stereo Audio Amplifier
with DC Volume Control and Headphone Output
Typical Operating Characteristics
(T =25°
C)
A
Speaker
1. THD+N vs Output Power
3
0
2
0
2. THD+N vs Output Power
30
20
1
0
RL=4
Ω
VDD=5V
10
RL=8
Ω
VDD=5V
5
5
%
2
%
2
1
1
0
.5
0
.5
0
.2
0
.2
0
.1
1m
2
m
5
m
10
m
2m
0
5m
0
W
1m
00
20m
0
50m
0
1
2
4
0
.1
1
m
2
m
5
m
10
m
2
0m
5m
0
W
10m
0
20m
0
50m
0
1
2
4
3. THD+N vs Frequency
10
5
4. THD+N vs Frequency
1
0
5
VDD=5V
RL=4Ω
Po=0.3W/1W/2W
Po=0.3W
VDD=5V
RL=8Ω
Po=0.3W/1W/1.3W
Po=0.3W
2
1
0
.5
%
0
.2
0
.1
0. 5
0
%
2
1
0.
5
0.
2
0.
1
Po=1W
Po=2W
05
.0
Po=1.3W
Po=1W
0. 2
0
02
.0
01
.0
2
0
0. 1
0
2
0
5
0
10
0
20
0
50
0
H
z
1k
2k
5
k
1k
0
2k
0
50
10
0
20
0
5
00
H
z
1k
2k
5
k
10
k
2k
0
5. PSRR vs Frequency
+
0
-5
-1
0
-1
5
-2
0
-2
5
6. Crosstalk vs Frequency
+0
T TT T T T T T T T T T
T TTTT TTT T
TT
T
1
-0
2
-0
3
-0
4
-0
-3
0
d
B
-3
5
-4
0
-4
5
-5
0
-5
5
-6
0
9
-0
7
-0
d
B
5
-0
6
-0
L to R
8
-0
-6
5
-7
0
2
0
-1
00
2
0
5
0
10
0
2
00
5
00
H
z
1
k
2
k
5
k
R to L
1k
0
2k
0
5
0
10
0
20
0
5
00
H
z
1
k
2
k
5
k
1k
0
2
0k
Power Analog Microelectronics
,
Inc
www.poweranalog.com
5
01/2012 Rev1.2
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