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PDF PAM8803 Data sheet ( Hoja de datos )
| Número de pieza | PAM8803 | |
| Descripción | 3W Filterless Stereo Class-D Audio Amplifier | |
| Fabricantes | Power Analog Micoelectronics | |
| Logotipo |  |
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PAM8803
3W Filterless Stereo Class-D Audio Amplifier
with Digital Volume Control
Key Features
n 3W Output at 10% THD with a 4Ω Load and
www.datashee5tV4u.Pcoomwer Supply
n Filterless, Low Quiescent Current and Low
EMI
n Low THD+N
n 64-step Digital Volume Control
n Superior Low Noise
n Low pop noise
n Efficiency up to 90%
n Short Circuit Protection
n Thermal Shutdown
n Few External Components to Save Space
and Cost
n Pb-Free Package
Applications
n LCD Monitors/TV Projectors
n Notebook Computers
n Portable Speakers
n Portable DVD Players, Game Machines
n Cellular Phones/Speaker Phones
General Description
The PAM8803 is a 3W, class-D audio amplifier
with 64-step digital volume control. It offers low
THD+N, allowing it to produce high-quality sound
reproduction. The new filterless architecture
allows the device to drive the speaker directly,
without needing 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 PAM8803 is much better than
class-AB cousins. It can extend the battery life,
ideal for portable applications.
The PAM8803 is available in a SSOP-24 package.
Typical Application
VD D
C1
1μF
PVDD C3 10μF
C2 1μF
7 18 5
4
VDD GND
+OUT_L
PVDD
23
PGND
PGND
+OUT_R
21
SP_L
1 -OUT_L
24
-OUT_R
ON
MUTE
ON
SHDN
C6 8
INL INL
0 .47μ F
10 VREF
C8 1μF
PAM8803
INR 17 C7
0.47μF
14
UP
S1
MUTE
SHDN
6 MUTE
19 SHDN
NC NC NCNCPVDD
9 11 12 16 20
DN 13
RST 15
PGND PGND
22 23
S2
S3
SP_R
INR
C4 1μF
PVDD C5 10μF
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency vs Output Power
RL=4Ω
RL=8Ω
0.5 1 1.5 2 2.5
Output Pow er(W)
Radiated Emissions
3
FCC Class B Limit
Power Analog Microelectronics,Inc
www.poweranalog.com
1
03/2009 Rev 1.1
1 page  
PAM8803
3W Filterless Stereo Class-D Audio Amplifier
with Digital Volume Control
Typical Operating Characteristics (TA=25°C)
www.datashe1e.t4TuH.coDm+N vs Output Power
30 RL=4Ω, Gain = 18dB
20
V =DD 2.5V
10
5
V =DD 3.6V
2
1
% 0.5
0.2
0.1
0.05
0.02
0.01
10m
20m
V =DD 5V
50m
100m
200m
W
500m
1
24
2. THD+N vs Output Power
RL=8Ω, Gain = 18dB
30
V =DD 2.5V
10
VDD=3.6V
5
2
1
% 0.5
0.2
0.1
0.05
0.02
0.01
10m
20m
50m 100m 200m
W
V =DD 5V
500m
1
2
4
3. THD+N vs Output Power
V =DD 5V, RL=4Ω, Gain = 18dB
100
50
20
10
5
2
%1
0.5
f=1kHz
0.2
0.1
0.05 f=10kHz
0.02
0.01
20m
50m 100m
200m
W
500m
f=100Hz
1 24
4. THD+N vs Output Power
VDD=5V, RL=8Ω, Gain = 18dB
100
50
20
10
5
2
%1
0.5
f=100Hz
f=1kHz
0.2
0.1
0.05 f=10kHz
0.02
0.01
20m
50m 100m 200m
500m 1 2 4
W
5. THD+N vs Frequency
V =DD 5V, RL=4Ω, Gain = 18dB
100
50
20
10
5
2
%1
0.5
Po=2W
0.2
0.1 Po=12.W5W
0.05
0.02
0.01
20
50 100 200
500
Hz
1k
2k
5k
10k 20k
6. THD+N vs Frequency
VDD=5V, RL=8Ω, Gain = 18dB
100
50
20
10
5
2
%1
0.5
Po=1W
0.2
0.1
0.05 Po=02.W5W
0.02
0.01
20
50 100 200
500 1k
2k
5k
Hz
10k 20k
Power Analog Microelectronics,Inc
www.poweranalog.com
5
03/2009 Rev 1.1
5 Page 
PAM8803
3W Filterless Stereo Class-D Audio Amplifier
with Digital Volume Control
Most applications require a ferrite bead filter
which shows at Figure 3. The ferrite filter
reduces EMI around 1 MHz and higher. When
wwws.dealteacshtienegt4ua.cofmerrite bead, choose one with high
impedance at high frequencies, but low
impedance at low frequencies.
OUT+
Ferrite Bead
220pF
OUT-
Ferrite Bead
220pF
Figure 3: Ferrite Bead Filter to reduce EMI
PCB Layout Guidelines
Grounding
At this stage it is paramount that we
acknowledge the need for separate grounds.
Noise currents in the output power stage need to
be returned to output noise ground and nowhere
else. Were these currents to circulate elsewhere,
they may get into the power supply, the signal
ground, etc, worse yet, they may form a loop and
radiate noise. Any of these instances results in
degraded amplifier performance. The logical
returns for the output noise currents associated
with Class D switching are the respective PGND
pins for each channel. The switch state diagram
illustrates that PGND is instrumental in nearly
every switch state. This is the perfect point to
which the output noise ground trace should
return. Also note that output noise ground is
PCB Top Layer
channel specific. A two channels amplifier has
two mutually exclusive channels and
consequently must have two mutually exclusive
output noise ground traces. The layout of the
PAM8803 offers separate PGND connections for
each channel and in some cases each side of the
bridge. Output noise grounds must tie to system
ground at the power in exclusively. Signal
currents for the inputs, reference, etc need to be
returned to quite ground. This ground only ties to
the signal components and the GND pin. GND
then ties to system ground.
Power Supply Line
As same to the ground, VDD and each channel
PVDD need to be separated and tied together at
the system power supply. Recommend that all
the trace could be routed as short and thick as
possible. For the power line layout, just imagine
water stream, any barricade placed in the trace
(shows in figure 4) could result in the bad
performance of the amplifier.
Figure 4
Components Placement
The power supply decoupling capacitors need to
be placed as close to VDD and PVDD pins as
possible. The inputs need to be routed away from
the noisy trace. The VREF bypass capacitor also
needs to be close to the pin of IC very much.
PCB Bottom Layer
Figure 5: Layout Example
Power Analog Microelectronics,Inc
www.poweranalog.com
11
03/2009 Rev 1.1
11 Page | ||
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