UTC34119
LINEAR INTEGRATED CIRCUIT
YOUW ANG ELECTRONICS CO.LTD
1
LOW POWER AUDIO AMPLIFIER
DESCRIPTION
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.
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=65
A, typical)
*Minimum number of external parts required.
DIP-8
BLOCK DIAGRAM
Bias
4
3
5
8
6
1
2
7
Amp 2
Amp 1
R
R
Inverting
Input
Non-
Inverting
Input
Vcc
Ripplie
Rejection
GND
MUTE
Output 2
Output 1
UTC34119
LINEAR INTEGRATED CIRCUIT
YOUW ANG ELECTRONICS CO.LTD
2
ABSOLUTE MAXIMUM RATINGS
(Ta=25
C)
Characteristic
Symbol
Value
Unit
Supply Voltage
Vcc
-1.0~+18
V
Output Current
Io
250
mA
Maximum input ,ripple
rejection, Mute pin voltage
Vi(max)
-1.0~Vcc+1.0
V
Applied output voltage(output
pin when disabled)
Vo
-1.0~Vcc+1.0
V
Junction Temperature
Tj
-55 ~ +150
C
PIN DESCRIPTION
Pin No.
Symbol
Description
1
Mute
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".
2
Ripple
Rejection
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.
3
Input(+)
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.
4
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.
5
Output 1
Amplifier a's output. The DC level is about (Vcc-0.7V)/2.
6
Vcc
DC supply voltage is applied to this pin(Vcc=2.0V ~16.0V)
7
GND
Ground pin
8
Output 2
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.
RECOMMENDED OPERATION CONDITIONS
(Ta=25
C
)
Characteristics
Symbol
Min
Typ
Max
Unit
Supply Voltage
Vcc
2.0
16
V
Load Impedance
Z
L
8
100
Peak Load Current
I
L
(peak)
200
mA
Differential Gain(5kHz Bandwidth)
G
V
0
46
dB
Voltage at Mute
Vi(mute)
0
Vcc
V
Ambient temperature
Ta
-20
470
C
UTC34119
LINEAR INTEGRATED CIRCUIT
YOUW ANG ELECTRONICS CO.LTD
3
ELECTRICAL CHARACTERISTICS
(Ta=25
C
,Vcc=6V,unless otherwise specified)
Characteristic
Symbol
Test Conditions
Min
Typ
Max Units
DC Characteristics
Vcc=3.0V, Mute=0.8V
2.7
4.0
mA
Operating current
Icc
Vcc=16.0, Mute=0.8V
3.3
5.0
mA
Vcc=3.0V,Mute=2.0V
65
100
A
R
L
=16
R1=75k
Output Voltage
Vo
Vcc=3.0V
1.0
1.15
1.25
V
Vcc=6.0V
2.65
Vcc=12.0V
5.65
Output Offset Voltage
Voo
Vcc=6.0V,Rf=75k
,R
L
=32
-30
0
+30
mV
Output High Level
V
OH
2.0V<Vcc<16V,Iout=-75mA
Vcc-1.0
V
Output Low Level
V
OL
2.0V<Vcc<16V,Iout=75mA
0.16
V
Input Bias Current
Ibias
-100
-200
nA
Equivalent Resistance
R
EQ
pin1
100
150
220
k
pin8
18
25
40
AC Characteristics
Open Loop Gain of Amp 1
Gv1
80
dB
Open Loop Gain of Amp 2
Gv2
f=1.0kHz,R
L
=32
-0.35
0
0.35
dB
Vcc=3.0V,R
L
=6
,THD<10%
55
Output Power
Po
Vcc=6.0V,R
L
=32
,THD<10%
250
mW
Vcc=12.0V,R
L
=100
,THD<10%
400
Vcc=6.0V,R
L
=32
,Po=125mW
0.5
1.0
Total Harmonic Distortion
THD
Vcc<3.0V,R
L
=8
,Po=20mW
0.5
%
(f=1.0kHz)
Vcc<12V,R
L
=32
,Po=200mW
0.6
Gain Bandwidth Product
GBW
1.5
MHz
C1=
,C2=0.01
F
50
Power Supply rejection
PSRR
C1=0.1
F,C2=0,f=1kHz,
12
dB
(Vcc=6.0V,
Vcc=3.0V)
C1=1.0
F,C2=5.0
F,f=1kHz
52
Muting
Gv(mute) Mute=2.0V,1.0kHz<f<20kHz
70
dB
TYPICAL APPLICATION CIRCUIT
UTC34119
Vcc
Mute
Rf
R1
0.1
F
1
F
5
F
Speak
er
Audio
Input
UTC34119
Vcc
Mute
75k
0.1
F
0.1
F
5
F
Speak
er
Audio
Input
3k
5
8
6
1
4
3
2
7
3
4
6
1
5
8
2
7
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