NTE990
Integrated Circuit
Dual Audio Power Amplifier
Description:
The NTE990 is a monolithic dual power amplifier designed to deliver 2W/channel continuous into 8
loads. The NTE990 is designed to operate with a low number of external components, and still pro-
vide flexibility for use in stereo phonographs, tape records and AMFM stereo receivers, etc. Each
power amplifier is biased from a common internal regulator to provide high power supply rejection,
and output Q point centering. The NTE990 is internally compensated for all gains greater than 10.
Features:
D
2W/channel
D
65 dB Ripple Rejection, Output Referred
D
65 dB Channel Separation, Output Referred
D
Wide Supply Range: 6V to 24V
D
Very Low CrossOver Distortion
D
Low Audio Band Noise
D
AC Short Circuit Protected
D
Internal Thermal Shutdown
Applications:
D
MultiChannel Audio Systems
D
Stereo Phonographs
D
Tape Recorders and Players
D
AMFM Radio Receivers
D
Servo Amplifiers
D
Intercom Systems
D
Automotive Products
Absolute Maximum Ratings:
Supply Voltage, V
CC
26V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Voltage, V
I
0.7V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Junction Temperature, T
J
+150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
0
to +70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature (During Soldering, 10sec), T
L
+300
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (V
S
= 20V, T
A
= +25
C, R
L
= 8
,
A
V
= 50 (34 dB) unless otherwise
specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
Total Supply Current
P
O
= 0W
25
50
mA
Output Power
THD = 10%
2.0
W/Ch
Total Harmonic Distortion
f = 1kHz, V
S
= 14V
P
O
= 50mW/Ch
0.075
%
P
O
= 500mW/Ch
0.045
%
P
O
= 1W/Ch
0.055
%
Output Swing
R
L
= 8
V
S
6
V
PP
Channel Separation
C
F
= 50
F, C
IN
= 0.1
F,
V
S
= 20V, V
O
= 4V
rms
50
70
dB
f = 1kHz, Output Referred
V
S
= 7V, V
O
= 0.5V
rms
60
dB
Power Supply Rejection Ratio
C
F
= 50
F, C
IN
= 0.1
F,
V
S
= 20V, V
ripple
= 1V
rms
50
65
dB
f = 120Hz, Output Referred
V
S
= 7V, V
ripple
= 0.5V
rms
40
dB
Equivalent Noise Input
R
S
= 0, C
IN
= 0.1
F, BW = 20Hz to 20kHz,
Output Noise Wideband
2.5
A
R
S
= 0, C
IN
= 0.1
F, A
V
= 200
0.8
mV
Open Loop Gain
R
S
= 0, f = 100kHz, R
L
= 8
70
dB
Input Offset Voltage
15
mV
Input Bias Current
50
nA
Input Impedance
Open Loop
4
M
DC Output Level
V
S
= 20V
9
10
11
V
Slew Rate
2.0
V/
s
Power Bandwidth
65
kHz
Current Limit
1.0
A
Note 1 For operation at ambient temperature greater than +25
C, the NTE990 must be derated
based on a maximum 150
C junction temperature using a thermal resistance which de-
pends upon device mounting techniques..
V
CC
Pin Connection Diagram
GND
GND
GND
GND
Feedback 2
Input 2
GND
Output 2
Feedback 1
Input 1
GND
Output 1
Bias
1
2
3
4
5
6
7
14
13
12
11
10
9
8
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