1248

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 16–Lead DIP type
package designed as an FM multiplex stereo demodulator.
Features:
D A PLL for High Multiplex–Efficiency Operation.
D Stable Operation at Low Voltages (VCC = 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 (GV = –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: (TA = +25°C unless otherwise specified)
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V
Lamp Indicator Current, ILAMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75mA
Power Dissipation, Pd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 550mW
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25° to +75°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +125°C
Electrical Characteristics: (TA = +25°C, VCC = 12V, VIN = 350mV, L + R = 90%, Pilot = 10%,
f = 1kHz unless otherwise specified)
Parameter
Symbol
Input Voltage
Test Conditions
Min
Typ
Max
Unit
VIN1
THD = 1%, L + R = 90%, P = 10%
350
–
–
mV
VIN2
THD = 1%
350
–
–
mV
Input Impedance
Zin
–
30
–
kΩ
Channel Separation
Sep
35
40
–
dB
Output Voltage
VOUT
–
310
–
–
CB
–
–
2
dB
Total Harmonic Distortion
THD
–
0.3
–
%
Lamp Voltage
Lon
–
6.5
–
mV
Hysteresis
Hys
–
3
–
dB
Capture Range
CR
–
±5
–
%
Carrier Leak
CL
f = 19kHz
–
35
–
dB
f = 38kHz
–
45
–
dB
–
80
–
dB
Channel Balance
SCA Rejection Ratio
VIN = 350mV
Pilot Level
SCA–R L + R = 80%, P = 10%, SCA = 10%
Threshold Voltage
VTH
–
1
–
V
Supply Voltage
VCC
5.4
–
14
V
IQ
–
15
–
mA
Quiescent Current
Pin Connection Diagram
VCC 1
16 VCO Frequency Control
Demodulate FM Input 2
15 Phase Det Output to VCO
Demodulate FM Input 3
14 Phase Det Output to VCO
Lt Audio Output 4
13 Phase Det Input
Rt Audio Output 5
12 19kHZ Test Point
Stereo Indicator Lamp 6
11 Phase Det Output to Switch
GND 7
10 Phase Det Output to Switch
Separation Control 8
9 IF Muting Circuit
16
9
1
8
.870 (22.0) Max
.260 (6.6)
Max
.200 (5.08)
Max
.100 (2.54)
.700 (17.78)
.099 (2.5) Min