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| 型號： | APA2030 |
| 廠商： | Anpec Electronics Corporation |
| 英文描述： | LJT 8C 8#16 SKT RECP |
| 中文描述： | 立體聲2.6W音頻放大器（增益控制） |
| 文件頁數(shù)： | 20/27頁 |
| 文件大?。?/td> | 746K |
| 代理商： | APA2030 |
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Copyright
ANPEC Electronics Corp.
Rev. A.2 - Apr., 2004
APA2030/2031
www.anpec.com.tw
20
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 90k
when 6dB
gain is setting and the specification calls for a flat
bass response down to 40Hz . Equation is reconfigured
as follow:
1
π
Ci=
(3)
Rifc
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. This leakage current
creates a DC offset voltage at the input to the ampli-
fier that reduces useful headroom, especially in high
gain applications. For this reason a low-leakage tan-
talum or ceramic capacitor is the best choice. When
polarized capacitors 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
/2,
which is likely higher that the source DC level. Please
note that it is important to confirm the capacitor po-
larity in the application.
Effective Bypass Capacitor, Cbypass
As with any power amplifier, proper supply bypass-
ing is critical for low noise performance and high
power supply rejection.
The capacitor location on both the bypass and power
supply pins should be as close to the device as
possible. The effect of a larger half supply bypass
capacitor is improved PSRR due to increased half-
supply stability. Typical applications employ a 5V regu-
lator with 1.0
μ
F and a 0.1
μ
F bypass capacitors which
aid in supply filtering. This does not eliminate the need
for bypassing the supply nodes of the APA2030/1.
The selection of bypass capacitors, especially Cb, is
thus dependent upon desired PSRR requirements,
click and pop performance.
The capacitor is fed from a 125k
source inside the
amplifier. Bypass capacitor, Cb, values of 3.3
μ
F to
10
μ
F ceramic or tantalum low-ESR capacitors are
recommended for the best THD and noise performance.
The bypass capacitance also effect to the start up
time. It is determined in the follow equation:
Tstart up =5x(Cbypassx125k
) (5)
Output Coupling Capacitor, Cc (for APA2030
only)
In the typical single-supply SE configuration, an out-
put coupling capacitor (Cc) is required to block the
DC bias at the output of the amplifier thus preventing
DC currents in the load. As with the input coupling
capacitor, the output coupling capacitor and imped-
ance of the load form a high-pass filter governed by
equation.
fc(highpass)=
C
L
C
R
2
1
π
(6)
For example, a 330
μ
F capacitor with an 8
speaker
would attenuate low frequencies below 60.6Hz. The
main disadvantage, from a performance standpoint,
is the load impedance is typically small, which drives
the low-frequency corner higher degrading the bass
response. Large values of C
C
are required to pass
low frequencies into the load.
Power Supply Decoupling, Cs
Application Descriptions
2
125k
Cbypass
1
×
<<
(4)
The APA2030/1 is a high-performance CMOS audio
amplifier that requires adequate power supply
decoupling to ensure the output total harmonic distor-
tion (THD) is as low as possible.
To avoid start-up pop noise occurred, the bypass volt-
age should be rise slower then the input bias voltage
and the relationship shown in equation should be
maintained.
f
C
(highpass)=
(2)
Ci
Rimin
×
π
2
180k
Ci
1
×
相關PDF資料 |
PDF描述 |
|---|---|
| APA2030RI-TR | Circular Connector; No. of Contacts:8; Series:MS27656; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No |
| APA2030RI-TRL | Circular Connector; No. of Contacts:8; Series:MS27656; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No |
| APA2030RI-TU | Circular Connector; No. of Contacts:8; Series:MS27656; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No |
| APA2030RI-TUL | Circular Connector; No. of Contacts:23; Series:MS27656; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No |
| APA2030RI-TY | LJT 23C 21#20 2#16 SKT RECP |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| APA2030_13 | 制造商:ANPEC 制造商全稱:Anpec Electronics Coropration 功能描述:Stereo 2.6W Audio Amplifier (With Gain Control) |
| APA2030QBI-TRG | 制造商:ANPEC 制造商全稱:Anpec Electronics Coropration 功能描述:Stereo 2.6W Audio Amplifier (With Gain Control) |
| APA2030RI-TR | 制造商:ANPEC 制造商全稱:Anpec Electronics Coropration 功能描述:Stereo 2.6W Audio Amplifier(With Gain Control) |
| APA2030RI-TRG | 制造商:ANPEC 制造商全稱:Anpec Electronics Coropration 功能描述:Stereo 2.6W Audio Amplifier (With Gain Control) |
| APA2030RI-TRL | 制造商:ANPEC 制造商全稱:Anpec Electronics Coropration 功能描述:Stereo 2.6W Audio Amplifier(With Gain Control) |
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