1236

NTE1236
Integrated Circuit
TV Sound IF System
Description:
The NTE1236 monolithic TV/FM sound system consists of a multistage limiting IF amplifier, DC gain
control, FM detector, and an audio driver constructed on a single silicon chip. Excellent sensitivity,
high AM rejection and an internally regulated power supply coupled with low external component requirements makes the NTE1236 suitable for a wide variety of applications including TV sound channels, FM radios and mobile communications equipment.
Features:
D Electronic Attenuator Replaces Conventional Volume Control
D High Sensitvity
D Low Harmonic Distortion
D Excellent AM Rejection: (5−dB typ. at 4.5MHz)
D Internal Zener Diode Regulated Supply
D Differential Peak Detector Requires Only One Single−Turned Coil
Absolute Maximum Ratings: (TA = +25°C, unless otherwise specified)
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3V
Input Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA
Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625mW
Operating Temperature Range, Topg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −20° to +75°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55° to +150°C
Note *. Pin 5 may be connected to any positive voltage through a suitable dropping resistor, provided
the dissipation rating is not exceeded.
Note **. For temperatures above 25°C, derate linearly at 5.0mW/°C.
Electrical Characteristics: (TA = +25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
10
16
24
mA
Static Characteristics
Supply Current
ICC
VCC = 9V
Zener Regulating Characteristics
VZ
10.3
11.2
12.2
V
Internal Power Dissipation
PD
330
345
360
mW
fo = 4.5MHz, fM = 400Hz,
∆f = ±25kHz
−
200
400
µV
Dynamic Characteristics
Input Limiting Voltage at −3dB
VIN(lim)
AM Rejection Ratio
AMR
f = 4.5MHz, FM: ∆f = ±25kHz,
AM: 30% @ 45MHz
40
50
−
dB
Recovered AF Voltage
VOD
0.5
0.75
−
Vrms
Total Harmonic Distortion
THD
f = 4.5MHz, VI = 0.1V,
∆f = ±25kHz,
±25kH fM = 400Hz
400H
−
0.9
2.0
%
−
17
−
kΩ
−
4
−
pF
−
3.25
−
kΩ
−
7.5
−
pF
−
7.5
−
kΩ
−
300
−
Ω
60
80
−
dB
Input Impedance
Parallel Resistance
Parallel Capacitance
Output Impedance
Parallel Resistance
Parallel Capacitance
Output Impedance
Pin 7
Rip
Terminal No. 1−2
f = 4.5MHz
Cip
Rop
Terminal No. 9−GND
f = 4.5MHz
Cop
zo
f = 400Hz
Pin 8
Attenuation
ATT
Rx = ∞
AF Voltage Gain
GV(ATF)
VI = 0.1Vrms, f = 400Hz
17.5
20
−
dB
Total Harmonic Distortion
THD(2)
VO = 2Vrms, f = 400Hz
−
1.5
−
%
Undistorted Output Voltage
VO
THD = 5%, f = 400Hz
2
2.5
−
Vrms
AF Input Resistance
RI
f = 400Hz
−
70
−
kΩ
AF Output Resistance
RO
−
270
−
Ω
Pin Connection Diagram
IF Input
1
14
AF Input
IF Input
2
13
Tone Control
GND
3
12
AF Output
GND
4
11
N.C.
VCC
5
10
IF Detector Tuning
Volume Control
6
9
IF Detector Tuning
De−Emphasis
7
8
AF Buffer Output
14
8
1
7
.785 (19.95)
Max
.300
(7.62)
.200 (5.08)
Max
.100 (2.45)
.600 (15.24)
.099 (2.5) Min