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參數(shù)資料
| 型號(hào)： | EUA5202 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 2-W Stereo Audio Power Amplifier with Mute |
| 中文描述： | 2 - W型立體聲音頻功率放大器靜音 |
| 文件頁數(shù)： | 18/22頁 |
| 文件大?。?/td> | 680K |
| 代理商： | EUA5202 |
EUA5202
DS5202 Ver 1.4 Nov. 2004
Application Information
Gain Setting Resistors, R
F
and R
I
The gain for each audio input of the EUA5202 is set by
resistors by resistors R
F
and R
I
according to equation 1
for BTL mode.
--------------------------------
(1)
BTL mode operation brings about the factor 2 in the gain
equation due to the inverting amplifier mirroring the
voltage swing across the load. Given that the EUA5202
is a MOS amplifier, the input impedance is very high,
value of R
F
increases. In addition, a certain range of R
F
values is required for proper start-up operation of the
amplifier. Taken together it is recommended that the
effective impedance seen by the inverting node of the
amplifier
be
set
between 5k
and 20k
.The effective
impedance is calculated in equation 2.
--------------------
(2)
As an example consider an input resistance of 10k
and
a feedback resistor of 50k
. The BTL gain of the
amplifier would be -10 and the effective impedance at
the inverting terminal would be 8.3k
, which is well
within the recommended range. For high performance
applications metal film resistors are recommended
because they tent to have lower noise levels than carbon
resistors. For
values
of
R
F
above 50k
the amplifier
tends to become unstable due to a pole formed from R
F
and the inherent input capacitance of the MOS input
structure. For this reason, a small compensation
capacitor of approximately 5pF should be places in
parallel with R
F
when R
F
is greater than 50k
. This, in
effect, creates a low pass filter network with the cutoff
frequency defined in equation 3.
-------------------- (3)
F
For example, if
R
F
is 100k
and C
F
is 5 pF then
f
C
is 318
KHz, which is well outside of the audio range.
Input Capacitor, C
I
In the typical application an input capacitor, C
I
, is
required to allow the amplifier to bias the input signal to
the proper dc level for optimum operation. In this case,
C
I
and R
I
form a high-pass filter with the corner
frequency determined in equation 4.
------------------- (4)
R
2
)
c(highpass
π
The value
of
C
I
is important to consider as it directly
affects the bass (low frequency) performance of the
circuit. Consider the example where R
I
is 10k
and the
specification calls for a flat bass response down to 40Hz.
Equation 8 is reconfigured as equation 5.
1
I
------------------------------------ (5)
C
I
In this example, C
I
is 0.40
μ
F so one would likely
choose a value in the range of 0.47
μ
F to 1
μ
F. A further
consideration for this capacitor is the leakage path from
the input source through the input network (R
I
, C
I
) and
the feedback resistor (R
F
) to the load. 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 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
DD
/2, which
is likely higher that the source dc level. Please note that
it is important to confirm the capacitor polarity in the
application.
C
=
I
R
F
R
I
F
R
R
R
R
+
I
C
I
F
C
R
2
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| EUA5202QIR | 2-W Stereo Audio Power Amplifier with Mute |
| EUA5202QIT | 2-W Stereo Audio Power Amplifier with Mute |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EUA5202QIR | 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 Mute |
| EUA5202QIR0 | 制造商:EUTECH 制造商全稱:Eutech Microelectronics Inc 功能描述:2-W Stereo Audio Power Amplifier with Mute |
| EUA5202QIR1 | 制造商:EUTECH 制造商全稱:Eutech Microelectronics Inc 功能描述:2-W Stereo Audio Power Amplifier with Mute |
| EUA5202QIT | 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 Mute |
| EUA5202QIT0 | 制造商:EUTECH 制造商全稱:Eutech Microelectronics Inc 功能描述:2-W Stereo Audio Power Amplifier with Mute |
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