參數(shù)資料
型號(hào)： APA4838RI-TU
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(yè)數(shù)： 21/29頁(yè)
文件大?。?/td> 244K
代理商： APA4838RI-TU
Copyright
ANPEC Electronics Corp.
Rev. A.
1 -
Apr
.,
2003
APA4838
www.anpec.com.tw
21
Optimizing Depop Circuitry
(Cont.)
Although the bypass pin current source cannot be
modified, the size of Cbypass can be changed to al-
ter the device turn-on time and the amount of clicks
and pops. By increasing the value of Cbypass, turn-
on pop can be reduced. However, the tradeoff for
using a larger bypass capacitor is to increase the turn-
on time for this device. There is a linear relationship
between the size of Cbypass and the turn-on time.
In a SE configuration, the output coupling capacitor,
C
C
, is of particular concern. This capacitor discharges
through the internal 10k
resistors. Depending on
the size of C
C
, the time constant can be relatively
large. To reduce transients in SE mode, an external
1k
resistor can be placed in parallel with the inter-
nal 10k
resistor. The tradeoff for using this resistor
is an increase in quiescent current.
In the most cases, choosing a small value of Ci in the
range of 0.33
μ
F to 1
μ
F, Cbypass being equal to 4.
7
μ
F and an external 1k
resistor should be placed in
parallel with the internal 10k
resistor should pro-
duce a virtually clickless and popless turn-on.
A high gain amplifier intensifies the problem as the
small delta in voltage is multiplied by the gain. So it
is advantageous to use low-gain configurations.
Application Descriptions ( Cont.)
Shutdown and Mute Function (Cont.)
The trigger point between a logic high and logic low
level is typically 2.0V. It is best to switch between
ground and the supply voltage V
DD
to provide maxi-
mum device performance.
By switching the Shutdown pin to high level, the am-
plifier enters a low-current state, I
DD
<1
μ
A. APA4838
is in shutdown mode. On normal operating, Shut-
down pin pull to low level to keeping the IC out of the
shutdown mode. The Shutdown pin should be tied
to a definite voltage to avoid unwanted state changes.
The APA4838 mutes the amplifier and DOCK out-
puts when V
DD
is applied to the Mute pin. Even while
muted, the APA4838 will amplify a system alert (beep)
signal whose magnitude satisfies the PCBEEP de-
tect circuitry. Applying 0V to the Mute pin returns the
APA4838 to normal operation. Prevent unanticipated
mute behavior by connecting the Mute pin to V
DD
or
ground. Do not let the Mute pin float.
Shutdown and Mute Function
In order to reduce power consumption while not in
use, the APA4838 contains a Shutdown pin to exter-
nally turn off the amplifier bias circuitry. This shut-
down feature turns the amplifier off when a logic high
is placed on the Shutdown pin.
PCBEEP Detect Circuitry
APA4838 integrates a PCBEEP detect circuit for note-
book and computer used. When Beep In signal is
greater than 1/2V
DD
, the PCBEEP mode is active.
APA4838 will force to BTL mode and the internal fixed
gain mode. The Beep In signal becomes the ampli-
fier input signal and plays on the system speaker with-
out coupling capacitor. Use input resistor between
stereo input pin and Beep In to attenuate Beep In
signal. These resistors are shown as 200k
devices
in Application Circuit. Use higher value resistors to
reduce the gain applied to the beep signal.
相關(guān)PDF資料
PDF描述
APA4838 Stereo 2.8W Audio Power Amplifier with DC Volume Control and Selectable Gain
APA4838R Stereo 2.8W Audio Power Amplifier with DC Volume Control and Selectable Gain
APA4863KI-TU Stereo 2.2W Audio Power Amplifier
APA4863OI-TR Stereo 2.2W Audio Power Amplifier
APA4863OI-TU Stereo 2.2W Audio Power Amplifier
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
APA4863 制造商:ANPEC 制造商全稱(chēng):Anpec Electronics Coropration 功能描述:Stereo 2.2W Audio Power Amplifier
APA4863_09 制造商:ANPEC 制造商全稱(chēng):Anpec Electronics Coropration 功能描述:Stereo 2.2W Audio Power Amplifier
APA4863KI-TR 制造商:ANPEC 制造商全稱(chēng):Anpec Electronics Coropration 功能描述:Stereo 2.2W Audio Power Amplifier
APA4863KI-TRG 制造商:ANPEC 制造商全稱(chēng):Anpec Electronics Coropration 功能描述:Stereo 2.2W Audio Power Amplifier
APA4863KI-TU 制造商:ANPEC 制造商全稱(chēng):Anpec Electronics Coropration 功能描述:Stereo 2.2W Audio Power Amplifier
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*