UNISONIC TECHNOLOGIES CO., LTD
3544
HEADPHONE AMPLIFIER FOR
CD-ROMS
DESCRIPTION
As a dual headphone amplifier the UTC
3544
is digital-source.
The UTC
3544
has a steady gain of 6dB and so it is unnecessary for
external gain setting. The UTC
3544
has internal mute function so
that it is greatly simplified for prevention of the popping sound when
power is turned on and off. To prevent damage from short circuits
the UTC
3544
is equipped with thermal shutdown circuit.
LINEAR INTEGRATED CIRCUIT
FEATURES
* Internal mute function to prevent popping sounds when
*the
power
is turned on and off.
* Built-in thermal shutdown circuit (150°C) to prevent
*damage
to the
IC if a short circuit occurs.
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
3544L-D08-T
3544G-D08-T
3544L-S08-R
3544G-S08-R
Package
DIP-8
SOP-8
Packing
Tube
Tape Reel
www.unisonic.com.tw
Copyright © 2009 Unisonic Technologies Co., Ltd
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QW-R107-040,C
3544
PIN DESCRIPTIONS
PIN NO.
PIN NAME
I/O
PIN VOLTAGE
LINEAR INTEGRATED CIRCUIT
INTERNAL EQUIVALENT CIRCUIT
Vcc
FUNCTION
1
OUT1
O
2.1V
1
Output pin
10k
7
OUT2
O
2.1V
(V
CC
=5V)
7
2
MUTE
I
0.1V
(When open)
Mute control pin
(set to low for
prevention of
popping noise
when power is
turned on and off).
Operating: High
Muting: Low(open)
Vcc
3
IN1
I
2.1V
3
Input pin
180k
BIAS
5
IN2
I
2.1V
(V
CC
=5V)
5
6
BIAS
I/O
2.1V
(V
CC
=5V)
Bias pin (the
external 47μF
capacitor also
serves as the
anti-pop time
constant, therefore
make the proper
considerations be
changing it).
4
8
GND
V
CC
I
I
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QW-R107-040,C
3544
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
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QW-R107-040,C
3544
ABSOLUTE MAXIMUM RATINGS
(Ta=25°C)
PARAMETER
Applied Voltage
Power Dissipation
Derate above 25°C
LINEAR INTEGRATED CIRCUIT
SYMBOL
V
MAX
P
D
RATINGS
7.0
450
UNIT
V
mW
4.5
mW/°C
Operating Temperature
T
OPR
-25 ~ +75
°C
Storage Temperature
T
STG
-55 ~ +125
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATING CONDITIONS
(Ta=25°C)
PARAMETER
Power Supply Voltage
SYMBOL
V
CC
MIN
2.8
TYP
MAX
6.5
UNIT
V
ELECTRICAL CHARACTERISTICS
(Ta=25°C, V
CC
=5.0V, R
L
=32Ω, V
IN
= -6dBV, f=1kHz)
PARAMETER
Mute Pin Control Voltage
Quiescent Current
Voltage Gain
Voltage Gain Difference Between Channels
Total Harmonic Distortion
Rated Output 1
Rated Output 2
Output Noise Voltage
Channel Separation
Mute Attenuation
Ripple Rejection
SYMBOL
V
TM
I
Q
Gv
△Gv
(DIFF)
THD
Po1
Po2
eN
CS
ATT
RR
CONDITIONS
V
IN
=0Vrms
MIN
0.3
4
4
-0.5
25
50
82
70
50
TYP
0.7
7
6
0
0.02
31
62
-93
90
80
57
MAX
1.6
10
8
0.5
0.1
UNIT
V
mA
dB
dB
%
mW
mW
dBV
dB
dB
dB
BW=20~20kHz
R
L
=32Ω,THD<0.1%
R
L
=16Ω,THD<0.1%
BW=20~20kHz,Rg=0Ω
Rg=0Ω
Rg=0Ω
f
RR
=100Hz, V
RR
= -20dBV
-85
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 10
QW-R107-040,C
3544
MEASUREMENT CIRCUIT
32
1
16
SW7
2
330μ
+
LINEAR INTEGRATED CIRCUIT
SW5 1
2
V
IN
2
V V
2AC
1μ
47μ
+
+
A I
Q
SW8B
10μ
Vcc
8
OUT2
7
BIAS
6
BIAS
6dB
IN2
5
TSD
SW8A
V
RR
6dB
1
2
+
MUTE
Vcc
32
SW1
16
1
2
V
1AC
V
+
90K
+
90K
1
OUT1
V
TM
2
MUTE
3
IN1
1
1μ
2
4
GND
330μ
SW3
V
IN1
MEASUREMENT CONDITIONS
SIGNAL
I
Q
V
TM
G
VC
△
Gvc
THD
Po1
Po2
V
NO
CS
1
1
2
1
1
1
1
1
2
2
2
1
1
2
2
1
2
2
2
1
2
1
2
1
1
1
2
1
1
1
1
1
2
2
2
2
2
2
2
1
ON
ON
ON
ON
ON
ON
ON
ON
V1AC,V2AC
V1AC,V2AC
V1AC,V2AC
V1AC,V2AC
V1AC,V2AC
V1AC,V2AC
V1AC,V2AC
V1AC,V2AC
fin=1kHz,V
IN
2= -6dBV,
V
TM
=1.6V
fin=1kHz,V
IN
1= -6dBV,
V
TM
=1.6V
fin=1kHz,V
IN
1/2= -6dBV,
V
TM
=0.3VB
V
RR
= -20dBV, f
RR
=100Hz
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QW-R107-040,C
SW1
1
1
SW3
1
2
SW TABLE
SW5
SW7
1
1
2
1
SW8A
2
2
SW8B
OFF
ON
MONITOR
I
Q
V1AC,V2AC
CONDITIONS
f=1kHz,V
IN
1/2=-6dBV,
V
TM
=1.6V
GVC1 – GVC2
fin=1kHz,V
IN
1/2= -6dBV,
V
TM
=1.6V
fin=1kHz,V
IN
1/2= -6dBV,
V
TM
=1.6V
fin=1kHz,V
IN
1/2= -6dBV,
V
TM
=1.6V
ATT
RR
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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