UTC 3544
LINEAR INTEGRATED CIRCUIT
HEADPHONE AMPLIFIER FOR
CD-ROMS
DESCRIPTION
The UTC 3544 is digital-source dual headphone amplifier.
The UTC 3544 has a fixed gain of 6dB so that external
gain setting is unnecessary. The UTC 3544 has internal
mute function so that prevention of the popping sound
when power is turned on and off is greatly simplified.
Also, The UTC 3544 is equipped with thermal shutdown
circuits to prevent damage from short circuits.
SOP-8
FEATURES
*Internal mute function to prevent popping sounds when
*the
power is turned on and off.
*Built-in thermal shutdown circuit (150℃) to prevent
*damage
to the IC if a short circuit occurs.
*Pb-free plating product number: 3544L
APPLICATIONS
Devices that use the headphone output from CD-ROMs,
CDs, MDs, personal computers, notebook computers,
camcorders, etc.
ABSOLUTE MAXIMUM RATINGS
(Ta=25℃)
PARAMETER
SYMBOL
RATINGS
7.0
450 *
-25½+75
-55½+125
UNIT
V
mW
℃
℃
Applied voltage
Vmax
Power dissipation
P
D
Operating temperature
Topr
Storage temperature
Tstg
*Reduced by 4.5mW for each increase in Ta of 1℃ over 25℃
RECOMMENDED OPERATING CONDITIONS
(Ta=25℃)
PARAMETER
Power supply voltage
SYMBOL
Vcc
MIN.
2.8
TYP.
MAX.
6.5
UNIT
V
UTC
UNISONIC TECHNOLOGIES
CO. LTD
1
QW-R107-040,A
UTC 3544
PARAMETER
LINEAR INTEGRATED CIRCUIT
SYMBOL
I
Q
V
TM
Gvc
△Gvc
THD
Po
1
Po
2
V
NO
CS
ATT
RR
ELECTRICAL CHARACTERISTICS
(Ta=25℃,Vcc=5.0V,R
L
=32Ω,V
IN
= -6dBV, f=1kHz)
CONDITIONS
V
IN
=0Vrms
MIN. TYP. MAX. UNIT
4
0.3
4
-0.5
25
50
82
70
50
7
0.7
6
0
0.02
31
62
-93
90
80
57
10
1.6
8
0.5
0.1
mA
V
dB
dB
%
mW
mW
dBV
dB
dB
dB
Quiescent current
Mute pin control voltage
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
BW=20½20kHz
R
L
=32Ω,THD<0.1%
R
L
=16Ω,THD<0.1%
BW=20½20kHz,Rg=0Ω
Rg=0Ω
Rg=0Ω
f
RR
=100Hz,V
RR
= -20dBV
-85
MEASUREMENT CIRCUIT
32
SW7
1
16
2
330μ
+
SW5
1μ
1
2
V V
7AC
V
IN
2
+
47μ
IN2
SW8B
A I
Q
+
CVcc
10μ
Vcc
8
OUT2
7
BIAS
6
5
BIAS
1
2
SW8A
TSD
+
6dB
Vcc
MUTE
32
SW1
1
+
6dB
+
90K
90K
V
RR
1
OUT1
2
MUTE
3
IN1
4
GND
1μ
SW3
1
2
16
2
V
1AC
V
330μ
V
TM
V
IN1
UTC
UNISONIC TECHNOLOGIES
CO. LTD
4
QW-R107-040,A
UTC 3544
SIGNAL
I
Q
V
TM
G
VC
△Gvc
THD
Po
1
Po
2
V
NO
CS
1
1
2
1
1
1
1
1
2
2
2
1
1
2
2
1
LINEAR INTEGRATED CIRCUIT
SW3
1
MEASUREMENT CONDITIONS
SW1
1
SW TABLE
SW5
SW7
1
1
SW8A
2
SW8B
OFF
MONITOR
I
Q
V1AC,V2AC
CONDITIONS
1
2
2
1
2
ON
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
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
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
ATT
RR
CIRCUIT OPERATION
Rising edge timing
Rise period
A
Play period
A
Rise period
B
Vcc
C
OUT
VMUTE
A: MUTE period(use with MUTE=Low to prevent the popping noise when the power is turned on and off).
B: MUTE release time(used to prevent the popping noise at the release of MUTE with the external C2 and R2
and therefore possesses a time constant,so be careful of the timing).
C: MUTE start time(also possesses a time constant like the MUTE release time).
UTC
UNISONIC TECHNOLOGIES
CO. LTD
5
QW-R107-040,A
Microcontroller MCU
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