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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 silicon monolithic integrated circuits consist of a six–stage IF amplifier/limiter, low–pass filter, dif ferential
peak detector, DC volume control, regulated power supply, audio preamplifier, and output stage.
The audio power amplifier will deliver 4W of low–distortion audio to a 16Ω 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 8Ω loud speaker.
The NTE1231 is supplied in a quad in–line 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 16–Lead DIP package with heat–sink 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 wiring 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
Repetitive Peak Output Current, I
Power Dissipation, P
T
= +90°C 4.3W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
pins
= +70°C 1W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T
A
Junction Temperature Range, T
CC
OUT
D
J
28V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–40° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Electrical Characteristics: (TA = +25°C, fo = 4.5MHz, fm = 400Hz, fd = ±7.5kHz, VCC = 12V,
R
= 8Ω, Vin = 1mV unless otherwise specified)
L
Parameter Symbol Test Conditions Min Typ Max Unit
Quiesecnt Output Voltage V
Quiescent Supply Current I
Input Limiting Threshold V
OUT
CC
TH
Vin = 0 5.1 6.0 6.9 V
RX = 22kΩ, Vin = 0 – 19 33 mA
RX = 0 – 40 100 µV
AM Rejection AMR fd = ±25kHz, m = 0.3 40 55 – dB
Signal–to–Noise Ratio S + N/N P
Recovered Audio V
out
Output Distortion THD P
Output Power P
OUT
= 0.5W, fd = ±25kHz 50 65 – dB
OUT
RX = 0 – 120 – mV
= 50mW – 1.0 – %
OUT
THD = 2%, fd = ±25kHz – 1.4 – W
THD = 10%, fd = ±25kHz – 1.5 – W
Power Supply Rejection PSR f = 120Hz, RX = 22kΩ, RL = 4Ω – 46 – dB
Input Resistance R
Input Capacitance C
in
in
– 30 – kΩ
– 5 – pF
Electrical Characteristics: (TA = +25°C, fo = 4.5MHz, fm = 400Hz, fd = ±7.5kHz, VCC = 24V,
R
= 16Ω, Vin = 1mV unless otherwise specified)
L
Parameter Symbol Test Conditions Min Typ Max Unit
Quiesecnt Output Voltage V
Quiescent Supply Current I
Input Limiting Threshold V
OUT
CC
TH
AM Rejection AMR fd = ±25kHz, m = 0.3 40 55 – dB
Vin = 0 11 12 13 V
RX = 22kΩ, Vin = 0 11 22 35 mA
RX = 0 – 40 100 µV
Signal–to–Noise Ratio S + N/N P
Recovered Audio V
out
Output Distortion THD P
Output Power P
OUT
= 1W, fd = ±25kHz 50 65 – dB
OUT
RX = 0 – 120 – mV
= 50mW – 0.75 – %
OUT
THD = 2%, fd = ±25kHz – 3.5 – W
THD = 10%, fd = ±25kHz – 4.2 – W
Power Supply Rejection PSR f = 120Hz, RX = 22kΩ, RL = 4Ω – 46 – dB
Input Resistance R
Input Capacitance C
in
in
– 30 – kΩ
– 5 – pF
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Pin Connection Diagram
IF Input
IF Decoupling
IF Decoupling
1
2
3
DE–Emphasis
12
Ripple Rejection
11
10
V
CC
NTE1231
FM Detector
FM Detector
DC Volume Control AF Feedback
4
5
6 7
12 7
16
9 AF Output
8 Compensation
.247 (6.27)
DC Volume Control
NTE1231
(17.2)
IF Decoupling
IF Decoupling
FM Detector
FM Detector
.677
IF Input
GND
GND
1
2
3
4
NTE1231A
5
6
7
8 9
DE–Emphasis
16
15
Ripple Rejection
14
V
CC
13
GND
12
GND
11 AF Output
10 Compensation
AF Feedback
.245 (6.22)
Min
.233
(5.9)
Max
.100 (2.54)
.700 (17.78)
.099 (2.5) Min
NTE1231A
16 9
.260 (6.6) Max
18
.785 (19.9)
Max
.200 (5.08)
Max
.260 (6.6).770 (19.5) Max
.300
(7.62)
.100 (2.54)
.700 (17.7)
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