NTE743 PLL Phase Lock Loop Stereo Decoder PDIP-16
Info as pdf-file
Description:
The NTE743 requires only a single, non critical resistive tuning adjustment. This device derives left
and right audio channels from the standard composite stereo decoder can also be used in a number
of subscription TV decoder schemes or in various proposed TV stereo systems.
Using phase-lock techniques, the subcarrier (38 KHz for FM stereo) is regenerated in phase with and
at exactly twice the frequency of the transmitted pilot signal. Switching between monaural and stereo
operation is accomplished automatically by the presence of the pilot signal.
Low-impedance emitter-follower outputs and an internal voltage regulator for increased stability
make the NTE743 suitable for both line-operated and automotive applications. It is designed to operate
over a wide supply-voltage range and will function with supplies as low as 9V.
Features:
- Internal Temperature Compensation
- Single-Adjustment Tuning
- Automatic Stereo/Mono Switching
- Stereo Indicator Lamp Driver
- 70dB SCA Rejection
- Operating Voltage- 9 to 16V
- Low Harmonic Distortion
Absolute Maximum Ratings:
Supply Voltage, VCC
Continous.................................................................. +16V
≤15s.......................................................................+22V
Lamp Supply Voltage, VLAMP.......................................................+22V
Lamp Current, ILAMP.............................................................150mA
Output Current, I4 or I5............................................................ 10mA
Package Power Dissipation, PD.................................................. 670mW
Derate Above 70°C.....................................................8.3mW/°C
Operating Temperature Range, TA...........................................-20° to +85°C
Storage Temperature Range, Tstg.......................................... -65° to +150°C
Electrical Characteristics:(T
A = +25°C, V
CC = 12V, Composite Input = 300mV
rms (L = R, Pilot OFF), Pilot Level = 30mV
rms, f
m = 400Hz or 1kHz unless otherwise specified)
| Parameter |
Test Conditions |
Min |
Typ |
Max |
Unit |
| Input Impedance |
Pin2 |
2 |
353 |
- |
k Ohm |
| Output Impedance |
Pin4 or Pin5 |
- |
50 |
- |
Ohm |
| Audio Voltage Gain |
Desired Channel |
0.7 |
1.0 |
1.4 |
V |
| Stereo Channel Separation |
fm = 100Hz |
- |
30 |
- |
dB |
| fm = 400Hz |
30 |
40 |
- |
dB |
| fm = 10kHz |
- |
30 |
- |
dB |
| Monaural Channel Balance |
Pilot Level = 0V |
- |
0.1 |
1.5 |
dB |
| Total Harmonic Distortion |
Multiplex Level = 600mV |
- |
0.4 |
1.5 |
% |
| Ultrasonic Frequency Rejection |
19kHz |
25 |
35 |
- |
dB |
| 38kHz |
25 |
40 |
- |
dB |
| SCA Rejection |
67kHz, Note 1 |
- |
70 |
- |
dB |
| Stereo Switch Level |
Pilot Only, Lamp ON |
- |
14 |
25 |
mVrms |
| Pilot Only, Lamp OFF |
2.0 |
7.0 |
- |
mVrms |
| VCO Tuning Resistance |
Pin15, Note 2 |
20 |
23 |
26 |
k Ohm |
| VCO Frequency Drift |
-20° < TA < +25°C |
- |
±0.5 |
±2.0 |
% |
| +25° < TA < +70°C |
- |
±0.5 |
±2.0 |
% |
| Stereo Lamp Hysteresis |
Lamp OFF to Lamp ON |
3.0 |
6.0 |
- |
dB |
| Capture Range |
Permissable Tuning Error |
- |
4.0 |
- |
% |
| Output Voltage Shift |
Stereo to Mono Operation |
- |
±30 |
- |
mV |
| Lamp Output Current |
Short Circuit, Lamp ON |
50 |
100 |
- |
mA |
| Lamp OFF |
- |
1.0 |
100 |
mA |
| Lamp Driver Terminal Voltage |
ILAMP = 50mA |
- |
1.3 |
2.0 |
V |
| Supply Current |
Lamp OFF |
- |
20 |
40 |
mA |
| Power Supply Rejection |
200Hz, 200mVrms |
- |
40 |
- |
dB |
| Note 1. | Measured with a stereo composite signal of 80% stereo, 10% pilot, and 10% SCA. |
| Note 2. | Total resistance from Pin15 to GND, to set reference frequency at Pin11 to 19kHz ±10Hz. |
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