UTC34119
DESCRIPTION
LINEAR INTEGRATED CIRCUIT
LOW POWER AUDIO AMPLIFIER
The UTC34119 is a low power audio amplifier integrated
circuit intended (primarily) for the telephone applications,
such as in speakerphones. It provides differential speaker
outputs to maximize output swing at low supply voltages.
Coupling Capacitor to the speaker are not required. Open
loop gain is 80dB, and the closed loop gain is set with two
external resistors. A chips Disable pin permits powering
down and/or muting the input signal.
DIP-8
SOP-8
FEATURES
*Wide operating supply voltage: Vcc=2~16V
*Low quiescent supply current(Icc=2.7mA,typical)
*Medium output power
Po=250mW at Vcc=6V,R
L
=32ohm ,Thd=10%
*Load Impedance range(8 ohms to 100 ohm)
*Low distortion
*Mute function(Icc=65µA, typical)
*Minimum number of external parts required.
SSOP-8
BLOCK DIAGRAM
Inverting
Input
Non-
Inverting
Input
4
3
Amp 1
R
R
5
Output 1
Amp 2
8
1
Output 2
Vcc
6
Bias
MUTE
2
Ripplie
Rejection
7
GND
YOUWANG ELECTRONICS CO.LTD
1
UTC34119
Characteristic
Supply Voltage
Output Current
Maximum input ,ripple
rejection, Mute pin voltage
Applied output voltage(output
pin when disabled)
Junction Temperature
LINEAR INTEGRATED CIRCUIT
Symbol
Vcc
Io
Vi(max)
Vo
Tj
ABSOLUTE MAXIMUM RATINGS
(Ta=25°C)
Value
-1.0~+18
±250
-1.0~Vcc+1.0
-1.0~Vcc+1.0
-55 ~ +150
Unit
V
mA
V
V
°C
PIN DESCRIPTION
Pin No.
1
Symbol
Mute
Description
This pin can be used to power down the IC to converse power, or for muting, or
both. When at a logic “LOW”(less than 0.8V), the IC is enabled for normal
operation. When at a logic “HIGH”(2.0V ~Vcc), the IC is disabled. If Mute is open,
that is equivalent to a logic “LOW”.
A capacitor at this pin increase power supply rejection, and affects turn-on time.
This pin can be left open if the capacitor at pin 1 is sufficient.
Analog Ground for the amplifiers. A 1.0 F capacitor at this pin (with a 5.0 F
capacitor at pin 8) provides 52dB(typical) of power supply rejection. Turn-on time
of the circuit is affected by the capacitor on this pin. This pin can be used as an
alternative input.
Amplifier input. The input capacitor and resistor set low frequency roll-off and input
impedance. The feedback resistor is connected between this pin and output 1.
Amplifier a’s output. The DC level is about (Vcc-0.7V)/2.
DC supply voltage is applied to this pin(Vcc=2.0V ~16.0V)
Ground pin
Amplifier 2’s output. This signal is equal in amplitude, but 180° out of phase with
that t output 1 the DC level is about(Vcc-0.7V)/2.
2
3
4
5
6
7
8
input(-)
Output 1
Vcc
GND
Output 2
RECOMMENDED OPERATION CONDITIONS
(Ta=25°C)
Characteristics
Supply Voltage
Load Impedance
Peak Load Current
Differential Gain(5kHz Bandwidth)
Voltage at Mute
Ambient temperature
Symbol
Vcc
Z
L
I
L
(peak)
∆G
V
Vi(mute)
Ta
Min
2.0
8
0
0
-20
Typ
Max
16
100
±200
46
Vcc
+70
Unit
V
Ω
mA
dB
V
°C
YOUWANG ELECTRONICS CO.LTD
Ripple
Rejection
Input(+)
2
UTC34119
ELECTRICAL CHARACTERISTICS
(Ta=25°C,Vcc=6V,unless otherwise specified)
LINEAR INTEGRATED CIRCUIT
Symbol
Test Conditions
Vcc=3.0V, Mute=0.8V
Vcc=16.0, Mute=0.8V
Vcc=3.0V,Mute=2.0V
R
L
=16Ω R1=75kΩ
Vcc=3.0V
Vcc=6.0V
Vcc=12.0V
Vcc=6.0V,Rf=75kΩ,R
L
=32Ω
2.0V<Vcc<16V,Iout=-75mA
2.0V<Vcc<16V,Iout=75mA
pin1
pin8
Characteristic
DC Characteristics
Operating current
Min
Typ
2.7
3.3
65
Max
4.0
5.0
100
1.25
Units
mA
mA
µA
V
Icc
Output Voltage
Vo
1.0
Output Offset Voltage
Output High Level
Output Low Level
Input Bias Current
Equivalent Resistance
AC Characteristics
Open Loop Gain of Amp 1
Open Loop Gain of Amp 2
Output Power
Voo
V
OH
V
OL
Ibias
R
EQ
-30
100
18
80
-0.35
55
250
400
1.15
2.65
5.65
0
Vcc-1.0
0.16
-100
150
25
+30
-200
220
40
mV
V
V
nA
kΩ
Gv1
Gv2
Po
Total Harmonic Distortion
(f=1.0kHz)
Gain Bandwidth Product
Power Supply rejection
(Vcc=6.0V,∆Vcc=3.0V)
Muting
THD
GBW
f=1.0kHz,R
L
=32Ω
Vcc=3.0V,R
L
=16Ω,THD<10%
Vcc=6.0V,R
L
=32Ω,THD<10%
Vcc=12.0V,R
L
=100Ω,THD<10%
Vcc=6.0V,R
L
=32Ω,Po=125mW
Vcc<3.0V,R
L
=8Ω,Po=20mW
Vcc<12V,R
L
=32Ω,Po=200mW
0
0.35
dB
dB
mW
0.5
0.5
0.6
1.5
50
12
52
70
1.0
%
MHz
dB
dB
C1=∞,C2=0.01µF
C1=0.1µF,C2=0,f=1kHz,
C1=1.0µF,C2=5.0µF,f=1kHz
Gv(mute) Mute=2.0V,1.0kHz<f<20kHz
PSRR
TYPICAL APPLICATION CIRCUIT
Vcc
Rf
Mute
75kΩ
Vcc
Mute
6
0.1µF
R1
1
0.1µF
6
Speaker
1
Speaker
4
Audio
Input
5
3
Audio
Input
5
UTC34119
3
2
1µF
5µF
UTC34119
4
3kΩ
8
7
8
2
7
0.1µF
5µF
YOUWANG ELECTRONICS CO.LTD
3
UTC34119
Vcc
75kΩ
LINEAR INTEGRATED CIRCUIT
Mute
0.001µF
Vcc
Mute
0.01µF
100kΩ
100kΩ
6
0.1µF
1
0.1µF
6
Speaker
1
Speaker
3
Audio
Input
5
3
Audio
Input
5
UTC34119
4
0.05µF
UTC34119
4
0.05µF
8
2
7
8
2
7
0.05µF
5.1kΩ
5.1kΩ
5µF
5.1kΩ
0.05µF
5µF
5.1kΩ
Vcc
Vcc
75kΩ
Audio
Input
0.1µF
3kΩ
4
5
Speaker
4.7kΩ
6
1
UTC34119
3
2
Vee
-1.0V ~ -8.0V
Mute
20kΩ
8
20kΩ
10kΩ
7
YOUWANG ELECTRONICS CO.LTD
4
UTC34119
PACKAGE OUTLINE
LINEAR INTEGRATED CIRCUIT
UNIT: mm
2.54
0.05
0.25
6.35
1.52 +0.3
-0
+0.4
9.40 -0.3
15 degree
0.5MIN
3.00MIN
0.89+0.35
-0.30
0.46
0.08
DIP-8-300-2.54
SOP-8-225-1.27
0.42
4.36MAX
7.62
0.25
0.2
6.0
1.27
4.9
0.1
0.20
YOUWANG ELECTRONICS CO.LTD
1.55
3.9
5.72
B
0.1
B
B
B
B
B
B
UNIT: mm
5
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