UTC KA8602
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R108-009,A
LOW VOLTAGE AUDIO POWER
AMPLIFIER
DESCRIPTION
The UTC KA8602 is the audio power amplifier
available for low voltage. The UTC KA8602 supplies
differential outputs for maximizing output swing at low
voltages. The UTC KA8602 does not need coupling
capacitors to the speaker. The gain of this amplifier is
controlled easily by two external resistors.
FEATURES
*Wide operating supply voltage: Vcc=2V~16V
*Low quiescent supply current( Icc=2.7mA, typ)
*Medium output power( Po=250mW at Vcc=6V,
R
L
=32ohm, THD=10%
*Load impedance range: 8~100ohm
*Mute function (Icc=65
A, typ)
*Minimum number of external parts required.
*Low distortion
DIP-8
SOP-8
BLOCK DIAGRAM
UTC KA8602
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R108-009,A
ABSOLUTE MAXIMUM RATINGS
(Ta=25
C )
PARAMETER
SYMBOL
VALUE
UNIT
Supply Voltage
Vcc
-1~18
V
Output Current
Io
+-250
mA
Maximum Input, Ripple Rejection, Mute Pin Voltage
Vi(max)
-1~Vcc+1
V
Applied Output Voltage( Output Pin When Disabled)
Vo
-1~Vcc+1
V
Temperature Junction
Tj
-55 ~ 150
C
PIN CONFIGURATIONS
PIN
NAME
DESCRIPTION
1
Input(+)
Analog Ground for the amplifiers. A 1
F capacitor at this pin ( with a 5
F capacitor at pin 8)
provides 52dB( typ) 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.
2
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.
3
Output 1
Amplifier 1' s output. The DC level is about (Vcc~0.7V)/2.
4
Vcc
DC supply voltage is applied to this pin( Vcc=2~16V).
5
GND
Ground pin.
6
Output 2
Amplifier 2' s output. This signal is equal in amplitude, but 180
out of phase with that output 1, the
DC level is about (Vcc~0.7V)/2.
7
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" (2V to
Vcc), the IC is disabled. If Mute is open, that is equivalent to a logic " LOW" .
8
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.
RECOMMENDED OPERATION CONDITIONS
(Ta=25
C)
PARAMETER
SYMBOL
VALUE
UNIT
Supply Voltage
Vcc
2~16
V
Load Impedance
Z
L
8~100
Peak Load Current
I
L(peak)
+-200
mA
Differential Gain(5KHz Bandwidth)
Gv
0~46
dB
Voltage at Mute
Vi(mute)
0~Vcc
V
Ambient Temperature
Ta
-20~470
C
UTC KA8602
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R108-009,A
ELECTRICAL CHARACTERISTICS
(Vcc=6V, Ta=25
C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DC PARAMETER
Operating Current
Icc
Vcc=3V, Mute=0.8V
2.7
4
mA
Vcc=16V, Mute=0.8V
3.3
5
mA
Vcc=3V, Mute=2V
65
100
A
Output Voltage
Vo
R
L
=16
, R1=75K
Vcc=3V
1
1.15
1.25
V
Vcc=6V
2.65
V
Vcc=12V
5.65
V
Output Offset Voltage
Voo
Vcc=6V, Rf=75K
,R
L
=32
-30
0
30
mV
Output High Level
V
OH
2V<Vcc<16V, Iout=-75mA
Vcc~1
V
Output Low Level
V
OL
2V<Vcc<16V, Iout=75mA
0.16
V
Input Bias Current
Ibias
-100
-200
nA
Equivalent Resistance
R
EQ
Pin 1
100
150
220
K
Pin 8
18
25
40
K
AC PARAMETER
Open Loop Gain of Amp. 1
Gv1
80
dB
Open Loop Gain of Amp. 2
Gv2
f=1KHz, R
L
=32
-0.35
0
0.35
dB
Output Power
Po
Vcc=3V, R
L
=6
, THD<10%
55
mW
Vcc=6V, R
L
=32
, THD<10%
250
mW
Vcc=12V, R
L
=100
, THD<10%
400
mW
Total Harmonic Distortion
(f=1KHz)
THD
Vcc=6V, R
L
=32
, Po=125mW
0.5
1
%
Vcc<3V, R
L
=8
, Po=20mW
0.5
%
Vcc<12V, R
L
=32
, Po=200mW
0.6
%
Gain Bandwidth Product
GBW
1.5
MHz
Power Supply Rejection
(Vcc=6V,
Vcc=3V)
PSRR
C1=
, C2=0.01
F
50
dB
C1=0.1
F, C2=0, f=1KHz
12
dB
C1=1
F, C2=5
F, f=1KHz
52
dB
Muting
Gv(mute)
Mute=2V, 1KHz<f<20KHz
70
dB
APPLICATION CIRCUIT
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