NTE1248
Integrated Circuit
Phase Lock Loop (PLL)
FM Multiplex Stereo Demod
Description:
The NTE1248 is a phase lock loop (PLL) system monolithic integrated circuit in a 16Lead DIP type
package designed as an FM multiplex stereo demodulator.
Features:
D
A PLL for High MultiplexEfficiency Operation.
D
Stable Operation at Low Voltages (V
CC
= 5.4V Min)
D
Low Lamp Lighting Level (6.5mV typ)
D
Separation Control Pin (Pin8)
D
Ability to Stop the VCO for Monaural Muting (Pin9)
D
Output Voltage Available with Low Loss (G
V
= 1dB typically)
D
Typically 0.3% Distortion
D
SCA Rejection Ratio (80dB)
Applications:
D
Stereo Radio Cassette Tape Recorders
D
Car Stereos
D
Home Stereos
Absolute Maximum Ratings: (T
A
= +25
C unless otherwise specified)
Supply Voltage, V
CC
14V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lamp Indicator Current, I
LAMP
75mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation, P
d
550mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
25
to +75
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
55
to +125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (T
A
= +25
C, V
CC
= 12V, V
IN
= 350mV, L + R = 90%, Pilot = 10%,
f = 1kHz unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Input Voltage
V
IN1
THD = 1%, L + R = 90%, P = 10%
350
mV
V
IN2
THD = 1%
350
mV
Input Impedance
Z
in
30
k
Channel Separation
Sep
35
40
dB
Output Voltage
V
OUT
V
IN
= 350mV
310
Channel Balance
CB
2
dB
Total Harmonic Distortion
THD
0.3
%
Lamp Voltage
Lon
Pilot Level
6.5
mV
Hysteresis
Hys
3
dB
Capture Range
CR
5
%
Carrier Leak
CL
f = 19kHz
35
dB
f = 38kHz
45
dB
SCA Rejection Ratio
SCAR L + R = 80%, P = 10%, SCA = 10%
80
dB
Threshold Voltage
V
TH
1
V
Supply Voltage
V
CC
5.4
14
V
Quiescent Current
I
Q
15
mA
19kH
Z
Test Point
IF Muting Circuit
Phase Det Output to Switch
Separation Control
Rt Audio Output
Demodulate FM Input
Phase Det Output to Switch
Phase Det Input
Phase Det Output to VCO
Phase Det Output to VCO
GND
Lt Audio Output
Demodulate FM Input
V
CC
VCO Frequency Control
Stereo Indicator Lamp
1
2
3
4
5
6
7
16
15
14
13
12
11
10
8
9
Pin Connection Diagram
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