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參數資料
| 型號： | EUA5212QIR |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 2-W Stereo Audio Power Amplifier with Four Selectable Gain Settings |
| 中文描述： | 2 - W型立體聲音頻功率放大器四種可選增益設置 |
| 文件頁數： | 14/17頁 |
| 文件大?。?/td> | 565K |
| 代理商： | EUA5212QIR |
EUA5212
DS5212 Ver 1.5 Nov. 2004
Decoupling Capacitor, (C
S
)
The EUA5212 is a high-performance CMOS audio
amplifier that requires adequate power supply
decoupling to ensure the output total harmonic distortion
(THD) is as low as possible. Power supply decoupling
also prevents oscillations for long lead lengths between
the amplifier and the speaker. The optimum decoupling
is achieved by using two capacitors of different types
that target different types of noise on the power supply
leads. (ESR) ceramic capacitor, typically 0.1
μ
F placed
as close as possible to the device
V
DD
lead, works best.
For filtering lower-frequency noise signals, a larger
aluminum electrolytic capacitor of 10
μ
F or greater
placed near the audio power amplifier is recommended.
Bypass Capacitor, (C
B
)
The bypass capacitor, C
B
, is the most critical capacitor
and serves several important functions. During start-up or
recovery from shutdown mode, C
B
determines the rate at
which the amplifier starts up. The second function is to
reduce noise produced by the power supply caused by
coupling into the output drive signal. This noise is from
the midrail generation circuit internal to the amplifier,
which appears as degraded PSRR and THD+N. Bypass
capacitor, C
B
, values of 0.47
μ
F to 1
μ
F ceramic or
tantalum low-ESR capacitors are recommended for the
best THD and noise performance.
Output coupling capacitor, (C
C
)
For general signal-supply SE configuration, the output
coupling capacitor (C
C
) 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 impedance of the load
form a high-pass filter governed by equation 4.
f
c(high)
=
C
C
L
R
1
π
------------------------ (4)
The main disadvantage, from a performance standpoint,
is the load impedances are 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. Consider the example where a
C
C
of 330
μ
F is chosen and loads vary from 3
, 4
,
8
, 32
, 10k
, to 47k
. Table 2 summarizes the
frequency response characteristics of each configuration.
Table2. Common Load Impedances vs Low
Frequency Output characteristics in SE Mode
R
L
C
C
Lowest
Frequency
161Hz
120Hz
60Hz
15Hz
0.05Hz
0.01Hz
3
4
8
32
10000
47000
330
μ
F
330
μ
F
330
μ
F
330
μ
F
330
μ
F
330
μ
F
As Table 2 indicates, most of the bass response is
attenuated into a 4-
load and 8-
load is adequate,
headphone response is good, and drive into line level
inputs (a home stereo for example) is exceptional.
Using low- ESR capacitors
Low- ESR capacitors are recommended throughout this
applications section. A real (as opposed to ideal)
capacitor can be modeled simply as a resistor in series
with an ideal capacitor. The voltage drop across this
resistor minimizes the beneficial effects of the capacitor
in the circuit. The lower the equivalent value of this
resistance the more the real capacitor behaves like an
ideal capacitor.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| EUA5212QIR0 | 制造商:EUTECH 制造商全稱:Eutech Microelectronics Inc 功能描述:2-W Stereo Audio Power Amplifier with Four Selectable Gain Settings |
| EUA5212QIR1 | 制造商:EUTECH 制造商全稱:Eutech Microelectronics Inc 功能描述:2-W Stereo Audio Power Amplifier with Four Selectable Gain Settings |
| EUA5212QIT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2-W Stereo Audio Power Amplifier with Four Selectable Gain Settings |
| EUA5212QIT0 | 制造商:EUTECH 制造商全稱:Eutech Microelectronics Inc 功能描述:2-W Stereo Audio Power Amplifier with Four Selectable Gain Settings |
| EUA5212QIT1 | 制造商:EUTECH 制造商全稱:Eutech Microelectronics Inc 功能描述:2-W Stereo Audio Power Amplifier with Four Selectable Gain Settings |
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