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參數(shù)資料
| 型號： | APA4838R |
| 廠商： | Anpec Electronics Corporation |
| 英文描述： | Stereo 2.8W Audio Power Amplifier with DC Volume Control and Selectable Gain |
| 中文描述： | 立體聲2.8W音頻功率放大器直流音量控制及可選擇增益 |
| 文件頁數(shù)： | 18/29頁 |
| 文件大小： | 244K |
| 代理商： | APA4838R |
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Copyright
ANPEC Electronics Corp.
Rev. A.
1 -
Apr
.,
2003
APA4838
www.anpec.com.tw
18
Application Descriptions ( Cont.)
Output SE/BTL Operation
The ability of the APA4838 to easily switch between
BTL and SE modes is one of its most important costs
saving features. This feature eliminates the require-
ment for an additional headphone amplifier in appli-
cations where internal stereo speakers are driven in
BTL mode but external headphone or speakers must
be accommodated.
Internal to the APA4838, two separate amplifiers drive
–Out and +Out for each channel (see Figure 1). The
HP Sense input controls the operation of the follower
amplifier that drives +Left Out and +Right Out.
When HP Sense is held low, the OP2 is turn on and
the APA4838 is in the BTL mode.
When HP Sense is held high, the OP2 is in a high
output impedance state, which configures the
APA4838 as SE driver from -Out. I
DD
is reduced by
approximately one-half in SE mode.
Control of the HP Sense input can be a logic-level
TTL source or a resistor divider network or the ste-
reo headphone jack with switch pin as shown in Ap-
plication Circuit.
Ring
Headphone Jack
Sleeve
Control
Pin
Tip
1k
VDD
100k
HP sense
Figure 2: HP Sense input selection by phonejack
plug
Output SE/BTL Operation (Cont.)
In Figure 2, input HP Sense operates as follows:
When the phonejack plug is inserted, the 1k
resis-
tor is disconnected and the HP Sense input is pulled
high and enables the SE mode.
When this input goes high level, the +Out amplifier is
shutdown causing the speaker to mute. The -Out
amplifier then drives through the output capacitor (C
C
)
into the headphone jack.
When there is no headphone plugged into the system,
the contact pin of the headphone jack is connected
from the signal pin, the voltage divider set up by re-
sistors 100k
and 1k
. Resistor 1k
then pulls low
the HP Sense pin, enabling the BTL function.
Docking Output Signal
APA4835 internal first amplifier is used as audio sig-
nal pre-amplfier and feedback resistor is connected
between Dock output pin and audio input pin.
However, the internal first amplifier’s closed-loop gain
can be adjusted using external resistors. Use Equa-
tion 2 to determine the input and feedback resistor
values for a desired gain.
The Dock output signal provides low distortion audio
quality for light driving output. ex. active speaker,
monitors or audio/visual equipment. These two out-
puts can driving load of >1k
with rail-to-rail output
and output coupling capacitor is required when using
these outputs.
R
F
Ri
(2)
A
V
=-
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| APA4838RI-TR | 制造商:ANPEC 制造商全稱:Anpec Electronics Coropration 功能描述:Stereo 2.8W Audio Power Amplifier with DC Volume Control and Selectable Gain |
| APA4838RI-TU | 制造商:ANPEC 制造商全稱:Anpec Electronics Coropration 功能描述:Stereo 2.8W Audio Power Amplifier with DC Volume Control and Selectable Gain |
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| APA4863KI-TR | 制造商:ANPEC 制造商全稱:Anpec Electronics Coropration 功能描述:Stereo 2.2W Audio Power Amplifier |
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