LOW VOLTAGE AUDIO AMPLIFIER
S1T8602B
1
INTRODUCTION
The S1T8602B is the audio power amplifier available for low voltages.
S1T8602B supplies differential outputs for maximizing output swing at
low voltages. S1T8602B doesn
'
t need coupling capacitors to the
speaker. The gain of this amp is controlled easily by two external
resistors.
FEATURES
Wide Supply Voltage (2 to 16V)
Low Quiescent Supply Current (I
CC
= 2.7mA : Typ)
Easy Gain Control
Medium Output Power
P
O
= 250mW at V
CC
= 6V, R
L
= 32
, THD = 10%
Minimum External Parts
Various Load Impedance Range (8
to 100
)
Low Distortion
Mute Function (l
CC
= 65
A: Typ)
ORDERING INFORMATION
Device
Package
Operating Temperature
S1T8602B01-D0B0
8
-
DIP
-
300
-
20
C to +70
C
S1T8602B01-S0B0
8
-
SOP
-
225
8
-
DIP
-
300
8
-
SOP
-
225
LOW VOLTAGE AUDIO AMPLIFIER
S1T8602B
3
PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
Pin No
Symbol
Description
1
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 (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 output1.
3
Output 1
The output of Amplifier 1. DC Level is (V
CC
- 0.7V)/2.
4
V
CC
DC supply voltage (+2.0 to + 16V) is applied to this pin.
5
GND
Ground pin.
6
Output 2
The output of Amplifier 2. This signal is equal in amplitude, but 180
out of phase with that
at output1. The DC level is (V
CC
- 0.7V)/2.
7
Mute
This pin can be used to power down the IC to conserve power or for muting, or both.
When at a logic Low (0 to 0.8 volts), the S1T8602B is enabled for normal operation. When
at a logic High (2.0 to V
CC
volts), the IC is disabled. If Mute is open, that is equivalent to a
logic Low.
8
Ripple Rejection
A capacitor at this pin increases power supply rejection, and affects turn-on time. This pin
can be left open if the capacitor at pin 1 is sufficient.
Characteristic
Symbol
Value
Unit
Supply Voltage
V
CC
-
1.0 to + 18
V
Output Current (output pin)
I
O
250
mA
Maximum Voltage (input, Ripple rejection, Mute pin)
V
I (MAX)
-
1.0 to V
CC
+ 1.0
V
Applied Output Voltage (output pin) when disabled
V
O
-
1.0 to V
CC
+ 1.0
V
Junction Temperature
T
J
-
55 to + 140
C
S1T8602B
LOW VOLTAGE AUDIO AMPLIFIER
4
RECOMMENDED OPERATING CONDITIONS
Characteristic
Symbol
Min.
Typ.
Max.
Unit
Supply Voltage
V
CC
+2.0
-
+16
V
Load Impedance
Z
L
8
-
100
W
Peak Load Current
I
L (PK)
-
200
-
200
mA
Differential Gain (5KHz Bandwidth)
G
V
0
-
46
dB
Voltage at Mute (Pin 7)
V
I (MUTE)
0
-
V
CC
V
Ambient Temperature
Ta
-
20
-
470
C
ELECTRICAL CHARACTERISTIC
(V
CC
= 6V, Ta = 25
C, unless otherwise noted)
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
DC ELECTRICAL CHARACTERISTICS
Operating Current (RL = 0)
I
CC
V
CC
= 3.0V, Mute = 0.8V
V
CC
= 16.0V, Mute = 0.8V
-
2.7
3.3
4.0
5.0
mA
V
CC
= 3.0V, Mute = 2.0V
-
65
100
A
Output Voltage (output pin)
V
O
RL = 16
R1 = 75k
V
CC
= 3.0V
V
CC
= 6.0V
V
CC
= 12.0V
1.0
1.15
2.65
5.65
1.25
V
Output Offset Voltage
V
OO
V
CC
= 6.0V, R
f
= 75k
, R
L
= 32
-
30
0
+30
mV
Output High Level
V
OH
2.0V
V
CC
16V, I
out
= -75mA
-
V
CC
-
1.0
-
V
Output Low Level
V
OL
2.0V
V
CC
16V, I
out
= 75mA
-
0.16
-
V
Input Bias Current (pin 2)
I
BIAS
-
-
-
100
-200
nA
Equivalent Resistance
R
EQ
pin 1
pin 8
100
18
150
25
220
40
k
Input Low Voltage
V
IL (MUTE)
-
-
-
0.8
V
Mute
Input High Voltage
V
IH (MUTE)
-
2.0
-
-
V
Input Resistance
R
I (MUTE)
V
CC
= Mute = 16V
50
90
175
k
AC ELECTRICAL CHARACTERISTICS
Open Loop Gain (Amp 1)
G
V (AMP1)
-
80
-
-
dB
Close Loop Gain (Amp 2)
G
V (AMP2)
f = 1.0kHz, R
L
= 32
-
0.35
0
+0.35
dB
Output Power
P
O
V
CC
= 3.0V, R
L
= 6
, THD
10%
V
CC
= 6.0V, R
L
= 32
, THD
10%
V
CC
= 12V, R
L
= 100
, THD
10%
55
250
400
-
-
mW
LOW VOLTAGE AUDIO AMPLIFIER
S1T8602B
5
Total Harmonic Distortion
(f = 1.0kHz)
THD
V
CC
= 6.0V, R
L
= 32
, P
O
=125mW
V
CC
3.0V, R
L
= 8
, P
O
= 20mW
V
CC
12V, R
L
= 32
, P
O
= 200mW
-
0.5
0.5
0.6
1.0
%
Gain Bandwidth Product
GBW
-
-
1.5
-
MHz
Power Supply Rejection
(V
CC
= 6.0V,
V
CC
= 3.0V)
PSRR
C
1
=
, C
2
= 0.01
F
C
1
=0.1
F, C
2
=0, f=1.0kHz
C
1
= 1.0
F, C
2
= 5.0
F, f = 1.0kHz
50
12
52
-
dB
Muting
G
V (MUTE)
Mute = 2.0V, 1.0Khz
f
20kHz
-
> 70
-
dB
ELECTRICAL CHARACTERISTIC (Continued)
(V
CC
= 6V, Ta = 25
C, unless otherwise noted)
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
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