NTE1231 & NTE1231A
Integrated Circuit
Complete 4 Watt TV Sound Channel
Description:
Capable of carrying out all of the functions of a TV sound channel, the NTE1231 and NTE1231A sili-
con monolithic integrated circuits consist of a sixstage IF amplifier/limiter, lowpass filter, differential
peak detector, DC volume control, regulated power supply, audio preamplifier, and output stage.
The audio power amplifier will deliver 4W of lowdistortion audio to a 16
load with a supply of 24V.
When used with a 12V supply, such as is found in many portable TV sets, these devices will furnish
1.5W to an 8
loud speaker.
The NTE1231 is supplied in a quad inline plastic package with a copper lead frame. This device is
designed to use the printed wiring board on which it is mounted for heat dissipation.
The NTE1231A is furnished in a 16Lead DIP package with heatsink contact tabs. The webbed lead
configuration (Pin4 & Pin5, Pin12 & Pin13) allows an inexpensive heat sink to be easily attached for
increased power dissipation capability and yet permits the use of a standard IC socket or printed wir-
ing board hole layout.
Features:
D
High Sensitivity
D
High AM Rejection
D
DC Volume Control
D
High Power Output
D
Low Distortion
D
Wide Operating Voltage Range: 9V to 28V
D
Low Quiescent Current Drain
Absolute Maximum Ratings:
Supply Voltage, V
CC
28V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repetitive Peak Output Current, I
OUT
1.5A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation, P
D
T
pins
= +90
C
4.3W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T
A
= +70
C
1W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Junction Temperature Range, T
J
40
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (T
A
= +25
C, f
o
= 4.5MHz, f
m
= 400Hz, f
d
=
7.5kHz, V
CC
= 12V,
R
L
= 8
, V
in
= 1mV unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Quiesecnt Output Voltage
V
OUT
V
in
= 0
5.1
6.0
6.9
V
Quiescent Supply Current
I
CC
R
X
= 22k
, V
in
= 0
19
33
mA
Input Limiting Threshold
V
TH
R
X
= 0
40
100
V
AM Rejection
AMR
f
d
=
25kHz, m = 0.3
40
55
dB
SignaltoNoise Ratio
S + N/N
P
OUT
= 0.5W, f
d
=
25kHz
50
65
dB
Recovered Audio
V
out
R
X
= 0
120
mV
Output Distortion
THD
P
OUT
= 50mW
1.0
%
Output Power
P
OUT
THD = 2%, f
d
=
25kHz
1.4
W
THD = 10%, f
d
=
25kHz
1.5
W
Power Supply Rejection
PSR
f = 120Hz, R
X
= 22k
, R
L
= 4
46
dB
Input Resistance
R
in
30
k
Input Capacitance
C
in
5
pF
Electrical Characteristics: (T
A
= +25
C, f
o
= 4.5MHz, f
m
= 400Hz, f
d
=
7.5kHz, V
CC
= 24V,
R
L
= 16
, V
in
= 1mV unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Quiesecnt Output Voltage
V
OUT
V
in
= 0
11
12
13
V
Quiescent Supply Current
I
CC
R
X
= 22k
, V
in
= 0
11
22
35
mA
Input Limiting Threshold
V
TH
R
X
= 0
40
100
V
AM Rejection
AMR
f
d
=
25kHz, m = 0.3
40
55
dB
SignaltoNoise Ratio
S + N/N
P
OUT
= 1W, f
d
=
25kHz
50
65
dB
Recovered Audio
V
out
R
X
= 0
120
mV
Output Distortion
THD
P
OUT
= 50mW
0.75
%
Output Power
P
OUT
THD = 2%, f
d
=
25kHz
3.5
W
THD = 10%, f
d
=
25kHz
4.2
W
Power Supply Rejection
PSR
f = 120Hz, R
X
= 22k
, R
L
= 4
46
dB
Input Resistance
R
in
30
k
Input Capacitance
C
in
5
pF
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