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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 15/22頁 |
| 文件大?。?/td> | 439K |
| 代理商： | AA4002 |
STEREO 2W AUDIO POWER AMPLIFIER
AA4002
Data Sheet
15
Sep. 2006 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
Application Information
(Continued)
But, decreasing voltage from 3.562V (point F), gain
does not change immediately, the change occurs at
3.5V (point E). There is a hysteresis which guarantees
that the volume control is monotonic, with immunity
against noise coupled from system. In above Table 1,
the column of Low Level means the lower threshold
voltage with the voltage of DC VOL varying from high
to low, High Level column means the other upper
threshold voltage DC VOL voltage varying from low
to high.
Mute, Shutdown
When applying high level to MUTE pin (pin 5), the
AA4002 will mute output stage stereo dock output-
whatever in BTL or SE mode. The AA4002 offers
shutdown function which can further reduce power
consumption. SHUTDOWN pin (pin 2) should be held
low in normal operation. If applying high level to
SHUTDOWN pin, the AA4002 will turn off internal
bias circuits, enter into shutdown mode with very low
quiescent current, 0.7
μ
A Typ. MUTE, SHUTDOWN
pin should be tied to high or low level to avoid undes-
ired operation state.
Left/Right Dock Output
There are stereo amplifiers built-in AA4002 front-end
input stages. It provide very low distortion audio moni-
tor signal for line out, the pass-band gain is determined
by external feedback resistors,
.....................................(5)
The dock output is also used as input source for back-
end amplifiers, so the gain of docking output
(A
VDOCK
) will affect total loop gain. The function of
C
OUT(L/R)
(0.1
μ
F) serial in Left/Right dock output is to
remove DC bias.
Beep Detect
Beep feature is used in Notebook PC system for alert-
ing. If peak-to-peak voltage of beep signal applied to
BEEP DETECT pin (pin 11) exceeds a certain voltage
called detect voltage, the feature will be activated, then
AA4002 will be forced at BTL mode with internal
fixed gain, ignoring MUTE and HP_SENSE pin logic
level. For AA4002, V
DETECT
is about 2.8V. Beep sig-
nal passes through Left/Right channel input path, the
gain under BTL load is only dependent on the ratio of
R
F(L/R)
to R
BEEP
.
.................................(6)
For resistors value given in Figure 28, A
VBEEP
is about
0.2 (-14dB). If this feature is not used, connecting the
capacitor (C
BEEP
) to ground, it is recommended
removing two resistors (R
BEEP
, 200k
), to minimize
crosstalk between left and right channel.
C
I
, C
OUT
, C
B
and C
S
(Power Supply
Bypassing Capacitor) Selection
For input stages of Left/Right channel, input capacitors
(C
IL
, C
IR
), are used to accommodate different DC level
between input source and AA4002 bias voltage (about
1/2 VDD). Input capacitors (C
IL
, C
IR
) and input
resistors (R
IL
, R
IR
) form first order High Pass Filters,
which determine the corner frequency,
..........................(7)
For given values in Figure 28, R
IL
=R
IR
=20k
,
C
IL
=C
IR
=0.33
μ
F, the corner frequency of input stage is
about 24Hz.
Similarly, for output stage in SE mode, output
capacitor (C
OUT
), and headphone load also form a first
order High Pass Filter, and its cut-off frequency is
determined by classic formula below.
....................(8)
For bypass capacitor (C
B
), the purpose is to filter
internal bias noise, reduce harmonic distortion, and
improve power supply rejection ratio performance.
Tantalum or ceramic capacitor with low ESR is
recommended, and is placed as close as possible to
chip bypass pin in PCB layout. Both input and output
)
/
(
)
/
(
)
/
(
R
L
I
R
L
F
R
L
VDOCK
A
R
R
=
BEEP
R
R
L
F
R
L
VBEEP
A
R
)
/
(
)
/
(
2
=
)
/
(
)
/
(
)
/
(
2
1
R
L
I
R
L
I
R
L
CI
C
R
f
=
π
)
/
(
)
/
(
)
/
(
2
1
R
L
O
R
L
HP
R
L
CO
C
R
f
=
π
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