NTE NTE742

NTE742
Integrated Circuit
TV Sound Channel, 2W
Description:
The NTE742 is designed for use as the entire sound function in television receivers or FM table radios.
The NTE742 sound channel will directly drive a 16 ohm speaker with more than 2 watts output. This
monolithic integrated circuit will operate from a single 18V to 28V power supply and can also function
(with reduced power output) with supplies as low as 12V if additional decoupling is provided.
The NTE742 is supplied in an improved 16–lead plastic dual in–line package with heat–sink contact
tabs. A copper alloy lead frame allows maximum power dissipation with standard cooling methods.
The unique lead configuration allows easy attachment of a heat sink and yet permits the use of a standard IC socket or printed wiring board layout.
Features:
D Low limiting Threshold
D Low External Parts Count
D Wide Operating Voltage Range
D 70dB Limiter Gain
D Automatic Thermal Shutdown
D Output Current Limiting
D Ripple Rejection Greater Than 20dB
Absolute Maximum Ratings:
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +28V
Regulator Output Current, IREG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
Input Voltage (Pin 10), VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.0V
Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +85°C
Storage Temperature Range, TS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Static Electrical Characteristics: (TA = +25°C, VCC = 24V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Quiescent Supply Current
ICC
VIN = 0
25
45
60
mA
Terminal Voltage
V2
VIN = 0
–
10
–
V
V3
–
2.6
–
V
VOUT
–
12
–
V
VREG
14
15
16
V
VIN
–
1.4
–
V
V14, V15
–
4
–
V
V16
–
8
–
V
Dynamic Electrical Characteristics:
(TA = +25°C, VCC = 24V, fo = 4.5MHz, fm = 400Hz, ∆f = 25kHz, VIN = 10mV unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Input Limiting Threshold
VTH
Note 1
–
150
400
µV
AM Rejection
AMR
Note 2
30
> 50
–
dB
Recovered Audio
VOUT
500
700
900
mV
Total Harmonic Distortion
THD
Test Pin16
–
<1
3
%
Test Pin6, POUT = 2W
–
2.5
10
%
–3dB, Note 3
6.0
7.5
10
V
–20dB, Note 3
2.0
2.8
4.0
V
–40dB, Note 3
0.75
1.2
1.8
V
V1 = 0V
–
5
25
mV
VOUT = 1V
25
27
29
dB
RL = 0Ω
–
800
–
mA
VOUT/VCC
VCC = 18V to 27V
–
0.5
–
V/V
Output Noise
en
VIN = 0V, V1 = 10V
–
5
25
mV
Power Amp Impedance
Zin
f = 1kHz
–
50
–
kΩ
Volume Control Voltage
V1
Playthrough
Power Amp Voltage Gain
Ae
Output Current Limiting
Output Tracking
IOUT
Note 1. Adjust V1 for VOUT = 2V, then reduce VIN until VOUT = 1.4V (–3dB).
Note 2. Adjust V1 for VOUT = 2V.
Note 3. Reference is VOUT at Pin 6 with V1 = 12V.
Pin Connection Diagran
DC Volume Control
1
16 De–Emphasis
Detector Output
2
15 Phase Shift
Amplifier Input
3
14 Phase Shift
GND
F
i
n
F
i
n
Audio Output
6
11 IF Decoupling
VCC
7
10 IF Input
Regulator Output
8
9
GND
Low–Level GND
.202 (5.12)
16
9
1
8
.770 (19.5)
Max
.254 (6.45)
.168 (4.26) Max
.141
(3.6)
.100 (2.54)
.700
(17.78)
.138
(3.5)
.300 (7.62)