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PDF PAM8803S Data sheet ( Hoja de datos )
| Número de pieza | PAM8803S | |
| Descripción | 3W Filterless Stereo Class-D Audio Amplifier | |
| Fabricantes | Power Analog Micoelectronics | |
| Logotipo |  |
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PAM8803S
Filterless 3W Class-D Stereo Audio Amplifier
with Digital Volume Control
Key Features
n 3W Output at 10% THD with a 4Ω Load and
www.datashee5t4Vu.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 the
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 PAM8803S 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 PAM8803S is much better
than class-AB cousins. It can extend the battery
life, ideal for portable applications.
The PAM8803S is available in a SSOP24
package.
Typical Application
VDD
PVDD
C1
1uF
C3 1uF
C2 10uF
VDD GND PVDD
4
+OUT_L
PGND
PGND
21
+OUT_R
SP_L
INL
1
-OUT_L
C6
8
0.47uF
10
C8 1uF
INL
VREF
24
-OUT_R
PAM8803S
C7
INR 17
0.47uF
154
UP S1
MUTE
6 MUTE
DN 143 S2
SHDN
19 SHDN
NC NC NC NC PVDD
PGND
RST 135
PGND
S3
SP_R
INR
C4 10uF
PVDD
C5 1uF
Note: Ceramic capacitor C2 and C4 can be replaced by two
220uF or one 470uF electrolytic capacitor.
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
08/2007
1 page  
PAM8803S
Filterless 3W Class-D Stereo Audio Amplifier
with Digital Volume Control
Typical Operating Characteristics(TA=25°C)
www.datas100he1e.t4TuH.coDm+N vs Output Power
50 V =DD 3V VDD=4V
20
10
5 V =DD 2V
2
%1
0.5
0.2
0.1
V =DD 6V
0.05 VDD=5V
V =DD 5.5V
0.02
0.01
10m 20m
50m 100m 200m
500m 1
2
5
W
V =DD 5V, RL=4Ω, Gain = 18.5dB
2. THD+N vs Output Power
100
50
V =DD 3V
VDD=5V
20 V =DD 4V
10
5 V =DD 2V
2
%1
0.5
0.2 V =DD 6V
0.1
0.05
V =DD 5.5V
0.02
0.01
10m 20m
50m 100m 200m
500m 1
2
W
VDD=5V, RL=8Ω, Gain = 18.5dB
4
3. THD+N vs Output Power
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
VDD=5V, RL=4Ω, PO=0.8W,Gain = 18.5dB
5. THD+N vs Frequency
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
VDD=5V, RL=4Ω,Gain = 18.5dB
10k 20k
4. THD+N vs Output Power
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
W
500m
1
24
V =DD 5V, RL=8Ω, PO=1.5W,Gain = 18.5dB
6. THD+N vs Frequency
100
50
20
10
5
2
%1
0.5
Po=1W
0.2
0.1
0.05 Po=20W.5W
0.02
0.01
20
50 100 200
500 1k
2k
5k
Hz
V =DD 5V, RL=8Ω,Gain = 18.5dB
10k
20k
Power Analog Microelectronics,Inc
www.poweranalog.com
5
08/2007
5 Page 
PAM8803S
Filterless 3W Class-D Stereo Audio Amplifier
with Digital Volume Control
Application Information(continued)
Most applications require a ferrite bead filter
wwww.dhaitacshheest4huo.cwoms at Figure 3. The ferrite filter
reduces EMI around 1 MHz and higher. When
selecting a ferrite bead, choose one with high
impedance at high frequencies, but low
impedance at low frequencies.
OUT+
Ferrite Bead
200pF
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.
OUT-
Ferrite Bead
200pF
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
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
PAM8803S 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
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.
Layout Example
Figure 5: PCB Top Layer
Figure 6: PCB Bottom Layer
Note: All the ground are separated
A1: Audio input ground
A2: Analog ground (GND) plane
A3: Left channel PGND plane
A4: Right channel PGND plane
Power Analog Microelectronics,Inc
www.poweranalog.com
11
08/2007
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet PAM8803S.PDF ] | |
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