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PDF ( 数据手册 , 数据表 ) EUA5312

零件编号 EUA5312
描述 2-W Stereo Audio Power Amplifier
制造商 Eutech Microelectronics
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EUA5312 数据手册, 描述, 功能
EUA5312
www.DataSheet4U.com 2-W Stereo Audio Power Amplifier
with Four Selectable Gain Settings
DESCRIPTOIN
The EUA5312 is a stereo audio power amplifier. When
driving 1 W into 8–speakers, the EUA5312 has less than
0.8% THD+N across its specified frequency range. Included
within this device is integrated depop circuitry that virtually
eliminates transients that cause noise in the speakers.
Amplifier gain is internally configured and controlled by way
of two terminals (GAIN0 and GAIN1). BTL gain settings of 6
dB, 10 dB, 15.6 dB, and 21.6 dB are provided, while SE
gain is always configured as 4.1 dB for headphone drive. An
internal input MUX allows two sets of stereo inputs to the
amplifier .The HP/LINE terminal allows the user to select
which MUX input is active, regardless of whether the
amplifier is in SE or BTL mode. In notebook applications,
where internal speakers are driven as BTL and the line outputs
(often headphone drive) are required to be SE, the EUA5312
automatically switches into SE mode when the SE/BTL input
is activated, and this reduces the gain to 4.1 dB.
The EUA5312 consumes only 6mA of supply current during
normal operation.
Block Diagram
FEATURES
z 2W per Channel Output Power Into 3-Load
z Internal Gain Control, Which Eliminates
External Gain-Setting Components
z Input MUX Select Terminal
z PC-Beep Input
z Depop Circuitry Integrated
z Two Input Modes Allowable with Single-Ended or
Fully Differential Input
z Low Supply Current and Shutdown Current
z Thermal Shutdown Protection
z TSSOP-24 with Thermal Pad
z RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
z Notebook Computers
z Multimedia Monitors
z Digital Radios and Portable TVs
DS5312 Ver 1.7 May. 2005
1







EUA5312 pdf, 数据表
www.DataSheet4U.com
Figure 9
Figure 11
EUA5312
Figure 10
Figure 12
Figure 13
DS5312 Ver 1.7 May. 2005
8
Figure 14







EUA5312 equivalent, schematic
SE/BTL Operation
Thewwabwi.lDitaytaSohfeetht4eU.EcoUmA5312 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 EUA5312 , two separate
amplifiers drive OUT+ and OUT- .The SE/BTL input
(terminal 15) control the operation of the follower
amplifier that drives LOUT- and ROUT- (terminals 9
and 16).When SE/BTL is held low, the amplifier is on
and the EUA5312 is in the BTL mode. When
SE/BTL is held high, the OUT- amplifiers are in a high
output impedance state, which configures the EUA5312
as an SE driver from LOUT+ and ROUT+ (terminals 4
and 21). IDD is reduced by approximately one-half in SE
mode. Control of the SE/BTL input can be from a
logic-level CMOS source or, more typically, from a
resistor divider network as shown in Figure 41.
EUA5312
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 VPP 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:
C PCB
1
2πf PCB (100k)
(7)
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-kdivider
pulls the SE/BTL input low. When a plug is inserted, the
1-kresistor is disconnected and the SE/BTL input is
pulled high. When the input goes high, the OUT-
amplifier is shut down causing the speaker to
mute(virtually open-circuits the speaker).The OUT+
amplifier then drives through the output capacitor (CO)
into the headphone jack.
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 5312 employs a shutdown mode of operation
designed to reduce supply current, IDD, 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, IDD=150µA. SHUTDOWN should
never be left unconnected because amplifier operation
would be unpredictable.
Table 6 . HP/LINE, SE/BTL , and Shutdown Function
Inputs
Amplifier State
HP/LINE SE/BTL SHUTDOWN INPUT OUTPUT
X
Low
Low
High
High
X
Low
High
Low
High
X= Do not care
Low
High
High
High
High
X Mute
Line BTL
Line SE
HP BTL
HP SE
DS5312 Ver 1.7 May. 2005
16










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