NTE NTE1248 Datasheet
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 (V
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
D Typically 0.3% Distortion
D SCA Rejection Ratio (80dB)
= 5.4V Min)
CC
= –1dB typically)
V
Applications:
D Stereo Radio Cassette Tape Recorders
D Car Stereos
D Home Stereos
Absolute Maximum Ratings
Supply Voltage, V
CC
Lamp Indicator Current, I
Power Dissipation, P
d
Operating Temperature Range, T
Storage Temperature Range, T
: (TA = +25°C unless otherwise specified)
LAMP
opr
stg
14V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
75mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
550mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–25° to +75°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–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 Test Conditions Min Typ Max Unit
Input Voltage V
Input Impedance Z
Channel Separation Sep 35 40 – dB
Output Voltage V
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
SCA Rejection Ratio SCA–R L + R = 80%, P = 10%, SCA = 10% – 80 – dB
Threshold Voltage V
Supply Voltage V
Quiescent Current I
V
OUT
IN1
IN2
CC
THD = 1%, L + R = 90%, P = 10% 350 – – mV
THD = 1% 350 – – mV
in
VIN = 350mV – 310 – –
f = 38kHz – 45 – dB
TH
Q
– 30 – kΩ
– 1 – V
5.4 – 14 V
– 15 – mA
V
CC
Demodulate FM Input
Demodulate FM Input
Lt Audio Output
Rt Audio Output
Stereo Indicator Lamp
GND
Separation Control
Pin Connection Diagram
1
2
3
4
5
6
7
16
15
14
13
12
11
10
8 9
VCO Frequency Control
Phase Det Output to VCO
Phase Det Output to VCO
Phase Det Input
19kHZ Test Point
Phase Det Output to Switch
Phase Det Output to Switch
IF Muting Circuit
Loading...