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參數(shù)資料
| 型號(hào)： | EUA5212 |
| 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(shè)置 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 565K |
| 代理商： | EUA5212 |
EUA5212
Application Information
Gain Setting
The gain of the EUA5212 is set by two input terminals,
Gain0 and Gain1.The gains listed in Table 1 are realized
by changing the taps on the input resistors inside the
amplifier.
Table 1.Gain Setting
A
V(inv)
0
0
0
2v/v
91k
0
1
0
6v/v
45.5k
1
0
0
12v/v
26k
1
1
0
24v/v
14k
X
X
1
1v/v
DS5212 Ver 1.5 Nov. 2004
GAIN0
GAIN1
BTL
SE/
Z
I
Input Resistance
Each gain setting is achieved by varying the input
resistance of the amplifier, which can range from its
smallest value to over 6 times that value. As a results, if a
single capacitor is used in the input high pass filter,
the –3 dB or cut off frequency will also change by over 6
times. If an additional resistor is connected from the input
pin of the amplifier to ground, as shown in the figure
below, the variation of the cut-off frequency will be much
reduced.
The -3dB frequency can be calculated using
equation 1:
f
-3dB
= ---------------------- (1)
If the filter must be more accurate, the value of the
capacitor should be increased while the value of the
resistor to ground should be decreased. In addition, the
order of the filter could be increased.
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 the input impedance of the amplifier, Z
i
, from a
high-pass filter with the corner frequency determined in
equation 2.
1
π
fc(highpass)=
i
i
C
Z
-----------------(2)
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 Z
i
is 710k
and the
specification calls for a flat bass response down to 40Hz.
Equation 2 is reconfigured as equation 3.
1
π
C
i
=
C
f
Z
i
----------------------------- (3 )
In this example, C
i
is 5.6nF so one would likely choose a
value in the range of 5.6nF to 1
μ
F. A further
consideration for this capacitor is the leakage path from
the input source through the input network (C
i
) and the
feedback network 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
than the source dc level. Note that it is important to
confirm the capacitor polarity in the application.
)
i
R
(R
π
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EUA5212QIR | 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 |
| 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 |
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