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參數(shù)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(shù)： | 16/17頁 |
| 文件大?。?/td> | 565K |
| 代理商： | EUA5212QIR |
EUA5212
BTL
SE/
Operation
The ability of the EUA5212 to easily switch between
BTL and SE modes is one of its most important cost
saving features. This feature eliminates the requirement
for an additional headphone amplifier in applications
where internal stereo speakers are driven in BTL mode
but external headphone or speakers must be
accommodated. Internal to the EUA5212 , two separate
amplifiers drive OUT+ and OUT- .The
BTL
SE/
input
(terminal 15) control the operation of the follower
amplifier that drives LOUT- and ROUT- (terminals 9
and 16).When
BTL
SE/
is held low, the amplifier is on
and the EUA5212 is in the BTL mode. When
BTL
SE/
is held high, the OUT- amplifiers are in a high
output impedance state, which configures the EUA5212
as an SE driver from LOUT+ and ROUT+ (terminals 4
and 21). I
DD
is reduced by approximately one-half in SE
mode. Control of the
BTL
SE/
input can be from a
logic-level CMOS source or, more typically, from a
resistor divider network as shown in Figure 41.
Using a readily available 1/8-in. (3.5mm) stereo
headphone jack, the control switch is closed when no
plug is inserted. When closed the 100-k
/1-k
divider
pulls the
BTL
SE/
input low. When a plug is inserted, the
1-k
resistor is disconnected and the
BTL
SE/
input is
pulled high. When the input goes high, the OUT-
amplifier is shutdown causing the speaker to mute
(virtually
open-circuits
the
speaker).The
OUT+
amplifier then drives through the output capacitor (C
O
)
into the headphone jack.
DS5212 Ver 1.5 Nov. 2004
PC BEEP operation
The PC BEEP input allows a system beep to be sent
directly from a computer through the amplifier to the
speakers with few external components. The input is
activated automatically. When the PC BEEP input is
active, both of the LINEIN and HPIN inputs are
deselected and both the left and right channels are driven
in BTL mode with the signal from PC BEEP. The gain
from the PC BEEP input to the speakers is fixed at
0.3V/V and is independent of the volume setting. When
the PC BEEP input is deselected, the amplifier will
return to the previous operating mode and volume
setting. Furthermore, if the amplifier is in shutdown
mode, activating PC BEEP will take the device out of
shutdown and output the PC BEEP signal, then return
the amplifier to shutdown mode.
The preferred input signal is a square wave or pulse train
with an amplitude of 1 V
PP
or greater. When the signal is
no longer detected, the amplifier will return to its
previous operating mode and volume setting.
If it is desired to ac-couple the PC BEEP input, the value
of the coupling capacitor should be chosen to satisfy
equation 7:
The PC BEEP input can also be dc- coupled to avoid
using this coupling capacitor. The pin normally sits at
midrail when no signal is present.
Shutdown Modes
The EUA 5212 employs a shutdown mode of operation
designed to reduce supply current , I
DD
, to the absolute
minimum level during periods of nonuse for
battery-power conservation. The SHUTDOWN input
terminal should be held high during normal operation
when the amplifier is in use. Pulling SHUTDOWN low
causes the outputs to mute and the amplifier to enter a
low-current state, I
DD
=150
μ
A. SHUTDOWN should
never be left unconnected because amplifier operation
would be unpredictable.
Table 6 .
LINE
Inputs
HP/
,
BTL
SE/
,
and Shutdown Function
Amplifier State
SHUTDOWN
INPUT
LINE
HP/
BTL
SE/
OUTPUT
X
X
Low
High
High
High
High
X
Mute
BTL
SE
BTL
SE
Low
Low
High
High
Low
High
Low
High
Line
Line
HP
HP
X= Do not care
)
)
(100k
2
1
C
PCB
PCB
≥
f
π
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相關代理商/技術參數(shù) |
參數(shù)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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