參數(shù)資料
型號(hào)： AA4002
廠商： BCD Semiconductor Manufacturing Limited
英文描述： STEREO 2W AUDIO POWER AMPLIFIER
中文描述： 2W的立體聲音頻功率放大器
文件頁(yè)數(shù)： 14/22頁(yè)
文件大?。?/td> 439K
代理商： AA4002
STEREO 2W AUDIO POWER AMPLIFIER
AA4002
Data Sheet
14
Sep. 2006 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
Application Information
(Continued)
..............................................(4)
Assuming R
BS
=R
F
=R
I
=20k
, C
BS
=0.068
μ
F and
f
BS
=117Hz, the bass boost characteristic is shown in
Figure 21.
Fixed Gain/Adjustable Gain Loop, MODE
pin, DC Volume Control
The AA4002 can be set in fixed gain or adjustable
gain, according to applying high or low level to MODE
pin (pin 4). Low level is for fixed gain, High level is
for adjustable gain, which permits to change volume by
applying various DC voltages to DC VOL pin (pin7).
Table 1 shows the relationship of Volume Attenuation
vs. the voltage of DC VOL pin.
There are 31 steps from 0 to -78dB; step size is
different for different volume control voltage,
1dB/step from 0dB to -6dB,
2dB/step from -6dB to -36dB,
3dB/step from -36dB to -47dB,
4dB/step from -47db to -51dB,
5dB/step from -51dB to -66dB,
The last step is 12dB from -66dB to -78dB.
For example, increasing voltage applied to DC VOL
pin from 3.437V (point B in Figure 23) to 3.562V
(point D), gain will change one step from -4dB to -3dB
(point F).
BS
BS
BS
C
R
f
π
2
1
=
Table 1. Volume Attenuation vs. DC VOL
Pin
Voltage
V
DD
=5V
High Level (V)
Attenuation (dB)
Low Level (V)
0
5
3.875
-1
3.937
3.750
-2
3.812
3.625
-3
3.687
3.500
-4
3.562
3.375
-5
3.437
3.250
-6
3.312
3.125
-8
3.187
3.000
-10
3.06
2.875
-12
2.937
2.750
-14
2.812
2.625
-16
2.687
2.500
-18
2.562
2.375
-20
2.437
2.250
-22
2.312
2.125
-24
2.187
2.000
-26
2.062
1.875
-28
1.937
1.750
-30
1.812
1.625
-32
1.687
1.500
-34
1.562
1.375
-36
1.437
1.250
-39
1.312
1.125
-42
1.187
1.000
-45
1.062
0.875
-47
0.937
0.750
-51
0.812
0.625
-56
0.687
0.500
-61
0.562
0.375
-66
0.437
0.250
-78
0.312
0
Figure 23.
Volume Attenuation vs. DC VOL
Pin
Voltage
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