參數(shù)資料
型號： 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
文件頁數(shù)： 19/29頁
文件大?。?/td> 244K
代理商： APA4838RI-TU
Copyright
ANPEC Electronics Corp.
Rev. A.
1 -
Apr
.,
2003
APA4838
www.anpec.com.tw
19
This leakage current creates a DC offset voltage at
the input to the amplifier that reduces useful
headroom, especially in high gain applications. For
this reason a low-leakage tantalum or ceramic ca-
pacitor is the best choice. When polarized capaci-
tors are used, the positive side of the capacitor should
face the amplifier input in most applications as the
DC level there is held at V
DD
/2, which is likely higher
that the source DC level. Please note that it is impor-
tant to confirm the capacitor polarity in the application.
Effective Bypass Capacitor, Cbypass
Input Capacitor, Ci (Cont.)
Typical values for the output coupling capacitors are
0.33μF to 1.0μF. If polarized coupling capacitors are
used, connect their ’+’ terminals to the respective
output pin.
The Right Dock and Left Dock channel outputs sig-
nal are also used to driving internal volume control
amplifier.
In the typical application an input capacitor, Ci, is re-
quired to allow the amplifier to bias the input signal to
the proper DC level for optimum operation. In this
case, Ci and the minimum input impedance Ri form a
high-pass filter with the corner frequency determined
in the follow equation:
F
C
(highpass)=
Docking Output Signal (Cont.)
Input Capacitor, Ci
1
2
π
RiCi
(3)
The value of Ci is important to consider as it directly
affects the low frequency performance of the circuit.
Consider the example where Ri is 100k
and the
specification calls for a flat bass response down to
40Hz. Equation is reconfigured as follow:
1
2
π
Rif
C
Consider to input resistance variation, the Ci is 0.04
μ
F
so one would likely choose a value in the range of
0.1
μ
F to 1.0
μ
F.
A further consideration for this capacitor is the leak-
age path from the input source through the input net-
work (Ri+Rf, Ci) to the load.
Ci=
(4)
As other power amplifiers, proper supply bypassing
is critical for low noise performance and high power
supply rejection.
The capacitors located on the bypass and power
supply pins should be as close to the device as
possible. The effect of a larger half supply bypass
capacitor will improve PSRR due to increased half-
supply stability. Typical application employ a 5V regu-
lator with 1.0
μ
F and a 0.1
μ
F bypass as supply filtering.
This does not eliminate the need for bypassing the
supply nodes of the APA4838. The selection of by-
pass capacitors, especially Cbypass, is thus depen-
dent upon desired PSRR requirements, click and pop
performance.
1
Cbypass x 125k
<<
1
RiCi
(5)
Application Descriptions ( Cont.)
To avoid start-up pop noise occurred, the bypass
voltage should rise slower than the input bias voltage
and the relationship shown in equation (5) should be
maintained.
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