UTC-IC 3544

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
Applied voltage
Vmax
Power dissipation
PD
Operating temperature
Topr
Storage temperature
Tstg
*Reduced by 4.5mW for each increase in Ta of 1℃ over 25℃
RATINGS
UNIT
7.0
450 *
-25~+75
-55~+125
V
mW
℃
℃
RECOMMENDED OPERATING CONDITIONS (Ta=25℃)
PARAMETER
Power supply voltage
UTC
SYMBOL
MIN.
Vcc
2.8
UNISONIC TECHNOLOGIES
TYP.
MAX.
UNIT
6.5
V
CO. LTD
1
QW-R107-040,A
UTC 3544
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
Vcc
OUT2
BIAS
IN2
8
7
6
5
BIAS
90K
6dB
+
TSD
90K
+
6dB
MUTE
UTC
1
2
3
4
OUT1
MUTE
IN1
GND
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QW-R107-040,A
UTC 3544
LINEAR INTEGRATED CIRCUIT
PIN DESCRIPTIONS
PIN NO.
PIN NAME
I/O
PIN VOLTAGE
INTERNAL EQUIVALENT CIRCUIT
1
OUT1
O
FUNCTION
Output pin
Vcc
2.1V
1
7
7
OUT2
O
10k
2.1V
(Vcc=5V)
Mute control pin
(set to low for
prevention of
popping noise
when power is
turned on and off).
Vcc
2
MUTE
I
0.1V
(When open)
2
Operating: High
Muting: Low(open)
190k
Input pin
Vcc
3
IN1
I
2.1V
3
5
IN2
I
2.1V
(Vcc=5V)
5
180k
BIAS
Vcc
6
BIAS
I/O
2.1V
(Vcc=5V)
60k
6
BIAS
60k
4
5
GND
Vcc
UTC
I
I
Bias pin(the
external 47μF
capacitor also
serves as the
anti-pop time
constant,
therefore make the
proper
considerations be
changing it).
-
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QW-R107-040,A
UTC 3544
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Ta=25℃,Vcc=5.0V,RL=32Ω,VIN= -6dBV, f=1kHz)
PARAMETER
SYMBOL
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
IQ
VTM
Gvc
△Gvc
CONDITIONS
MIN. TYP. MAX. UNIT
VIN=0Vrms
4
0.3
4
-0.5
BW=20~20kHz
RL=32Ω,THD<0.1%
RL=16Ω,THD<0.1%
BW=20~20kHz,Rg=0Ω
Rg=0Ω
Rg=0Ω
THD
Po1
Po2
VNO
CS
ATT
RR
82
70
50
7
0.7
6
0
0.02
31
62
-93
90
80
57
1μ
1
25
50
fRR=100Hz,VRR= -20dBV
10
1.6
8
0.5
0.1
-85
mA
V
dB
dB
%
mW
mW
dBV
dB
dB
dB
MEASUREMENT CIRCUIT
32
SW5
SW7
1
16
330μ
+
2
2
V V7AC
VIN2
+
SW8B
+
A IQ
CVcc
10μ
Vcc
IN2
BIAS
OUT2
7
8
47μ
6
5
BIAS
1
2
SW8A
90K
6dB
+
90K
TSD
VRR
+
6dB
Vcc
MUTE
32
SW1
1
1
+
16
2
2
3
MUTE
OUT1
4
IN1
GND
1μ
330μ
V1AC V
SW3
1
2
VTM
VIN1
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QW-R107-040,A
UTC 3544
LINEAR INTEGRATED CIRCUIT
MEASUREMENT CONDITIONS
SIGNAL
SW TABLE
SW5
SW7
SW1
SW3
IQ
VTM
1
1
1
GVC
1
2
THD
1
Po1
MONITOR
SW8A
SW8B
1
2
OFF
IQ
2
1
2
ON
V1AC,V2AC
2
2
1
2
ON
V1AC,V2AC
1
2
2
1
2
ON
V1AC,V2AC
Po2
2
2
2
2
2
ON
V1AC,V2AC
VNO
1
1
1
1
2
ON
V1AC,V2AC
CS
1
1
1
2
2
1
1
1
2
2
ON
ON
V1AC,V2AC
V1AC,V2AC
ATT
1
2
2
1
2
ON
V1AC,V2AC
RR
1
1
1
1
1
ON
V1AC,V2AC
△Gvc
CONDITIONS
f=1kHz,VIN1/2=-6dBV,
VTM=1.6V
GVC1 – GVC2
fin=1kHz,VIN1/2= -6dBV,
VTM=1.6V
fin=1kHz,VIN1/2= -6dBV,
VTM=1.6V
fin=1kHz,VIN1/2= -6dBV,
VTM=1.6V
fin=1kHz,VIN2= -6dBV,
VTM=1.6V
fin=1kHz,VIN1= -6dBV,
VTM=1.6V
fin=1kHz,VIN1/2= -6dBV,
VTM=0.3VB
VRR= -20dBV,
fRR=100Hz
CIRCUIT OPERATION
Rising edge timing
Rise period
Play period
A
B
A
Rise period
C
Vcc
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).
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UTC 3544
LINEAR INTEGRATED CIRCUIT
APPLICATION EXAMPLE
330μ
+
Vcc
+
BIA
S
OUT2
Vcc
7
8
1μ
47μ
+
VIN2
IN2
6
5
BIAS
90K
6dB
+
TSD
90K
+
6dB
MUTE
1
2
OUT1
3
MUTE
4
IN1
GND
+
1μ
VMUTE
VIN1
100k
1μ
H:Active
L:Mute
EXPLANATION OF EXTERNAL XOMPONENTS
(1)Input coupling capacitor(C3 and C5)
Determined by the low-band cut-off frequency.Since the input impedance for this IC is 180kΩ,it can be
determined by the formula below,but take into consideration the fluctuations,ambent temperature,etc.(a
multi-layered ceramic capacitor is recommended).
C3(C5)=1/(2π×180kΩ×f)
(2)BIAS capacitor(C6)
47μF when Vcc=5V,and 33μF when Vcc=3V.If the capacitance is lowered too much,the electrical
characteristics will be adversely affected and popping noise may occur.Therefore,take th sufficient considerations
before changing these values.
(3)MUTE pin for anti-pop measures(R2 and C2)
Possesses an impedance of 190kΩ with respect to GND,so if R2 is increased too much,the MUTE mode may
become unable to be released.
(4)Output coupling capacitor(C1 and C7)
Determined by the low-band cutoff frequency.As the output load resistance value RL(assuming that for output
protection or current limiting,a resistor Rx will be inserted),it can be determined by the formula below.
C1(C7)=1/(2π×(RL+Rx) ×f)
(5)Input gain adjustment resistor(R3 and R4)
Input gain adjustment can by performed by extemal resistors R3 and R4,The desired gain can be set by the
formula givev below.
Gvc=6+20log(90kΩ/(90kΩ+R3))[ dB ]
UTC
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QW-R107-040,A
UTC 3544
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTIC CURVES
Fig.1 Quiescent current vs. power supply voltage
Fig.2 Pin DC current vs. power supply voltage
Ta=25℃
9 RL=32Ω
8
MUTE:
OFF
7
6
5
4
3
MUTE: ON
2
1
0
2
0
4
6
8
4
4
3
3
2
2
1
1
0
10
0
SUPPLY VOLTAGE: Vcc (V)
0
2
4
6
8
0
6
Ta=25℃
RL=32Ω
Vcc=5V
-10 VIN=0dBV
-20 f=1kHz
VOLTAGE GAIN:Gvc(dB)
4
-30
-40
-50
-60
-70
2
0
-2
-4
-6
-8
Ta=25℃
RL=32Ω
Vcc=5V
-10
-80
-90
0.4
10
Fig.4 Voltage gain vs.frequency
10
0
8
SUPPLY VOLTAGE:Vcc(V)
Fig.3 Output voltage vs. MUTE control voltage
OUTPUT VOLTAGE: VOUT (dBV)
5
Ta=25℃
RL=32Ω
OUTPUT DC VOLTAGE: Vo (V)
5
BIAS DC VOLTAGE: VBIAS (V)
QUIESCENT CURRENT: IQ (mA)
10
0.8
1.2
1.6
2
-12
10
100
1k
10k
100k
MUTE CONTROL VOLTAGE VTM
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UTC 3544
LINEAR INTEGRATED CIRCUIT
Fig.5 Total harmonic distortion vs. output voltage ( I )
Fig.6 Total harmonic distortion vs. output voltage ( II )
10
Ta=25℃
RL=32Ω
Vcc=5V
TOTAL HARMONIC DISTORTION:THD(%)
TOTAL HARMONIC DISTORTION:THD(%)
10
1
f=10kHz
0.1
f=1kHz
0.01
f=100Hz
0.001
-40
-30
-10
-20
0
10
Ta=25℃
RL=32Ω
Vcc=3V
1
f=10kHz
0.1
f=1kHz
0.01
f=100Hz
0.001
-40
-30
OUTPUT VOLTAGE: Vo (dBV)
Fig.7 Total harmonic distortion vs. output voltage (III)
10
10
Ta=25℃
R L=16Ω
Vcc=5V
TOTAL HARMONIC DISTORTION:THD (%)
TOTAL HARMONIC DISTORTION:THD (%)
0
Fig.8 Total harmonic distortion vs. output voltage( IV )
10
1
f=10kHz
f=1kHz
0.1
0.01
f=100Hz
0.001
-40
-30
-10
-20
0
10
Ta=25℃
R L =16Ω
Vcc=3V
1
f=1kHz
f=100Hz
0.01
0.001
-40
60
40
20
1k
10k
90
70
60
50
40
30
20
100k
0
10
V TM =OPEN
R L =32Ω
V IN =0dBV
Vcc=5V
C-BIAS: 100μ
F
C-BIAS: 47μF
C-BIAS: 33μ
F
100
FREQUENCY: f (Hz)
UTC
10
80
10
100
0
100
MUTE ATTENUTION: ATT (dB)
80
0
10
-10
-20
Fig.10 MUTE attenuation vs.frequency
Ta=25℃
R L =32Ω
Rg=0Ω
Vcc=5V
100
-30
OUTPUT VOLTAGE: Vo (dBV)
Fig.9 Channel separation vs.frequency
120
f=10kHz
0.1
OUTPUT VOLTAGE: Vo (dBV)
CHANNEL SEPARATION: CS
(dB)
-10
-20
OUTPUT VOLTAGE: Vo (dBV)
UNISONIC TECHNOLOGIES
1k
10k
100k
FREQUENCY: f (Hz)
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QW-R107-040,A
UTC 3544
LINEAR INTEGRATED CIRCUIT
Fig.11 Ripple rejection vs.frequency
Ta=25℃
VRR= -20dBV
Rg=0Ω
Vcc=5V
70
RIPPLE REJECTION: RR (dB)
Fig.12 Ripple rejection vs.power supply voltage
60
50
40
30
20
10
0
10
100
Ta=25℃
VRR= -20dBV
RL=32Ω
Rg=0Ω
fRR=100Hz
90
RIPPLE REJECTION:RR (dB)
80
80
70
6
0
50
40
30
20
10
0
100
1k
10k
100k
0
2
FREQUENCY: f (Hz)
4
6
8
10
SUPPLY VOLTAGE: Vcc (V)
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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QW-R107-040,A