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NTE743 Integrated Circuit Phase Lock Loop (PLL) Stereo Decoder
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: D D D D D D D 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 70C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3mW/C Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20 to +85C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C
Electrical Characteristics: (TA = +25C, VCC = +12V, Composite Input = 300mVrms (L = R, Pilot OFF), Pilot Level = 30mVrms, fm = 400Hz or 1KHz, unless otherwise indicated) Characteristics Input Impedance Output Impedance Audio Voltage Gain Stereo Channel Separation Pin2 Pin4 or Pin5 Desired Channel fm = 100Hz fm = 400Hz fm = 10kHz Monaural Channel Balance Total Harmonic Distortion Pilot Level = 0V Multiplex Level = 600mV Test Conditions Min 2 - 0.7 - 30 - - - 25 25 - - 2.0 20 - - 3.0 - - 50 - - - - Typ 353 50 1.0 30 40 30 0.1 0.4 35 40 70 14 7.0 23 0.5 0.5 6.0 4.0 30 100 1.0 1.3 20 40 Max - - 1.4 - - - 1.5 1.5 - - - 25 - 26 2.0 2.0 - - - - 100 2.0 40 - Unit k V dB dB dB dB % dB dB dB mVrms mVrms k % % dB % mV mA mA V mA dB
Ultrasonic Frequency Rejection 19kHz 38kHz SCA Rejection Stereo Switch Level 67KHz, Note 1 Pilot Only, Lamp On Pilot Only, Lamp Off VCO Tuning Resistance VCO Frequency Drift Pin15, Note 2 -20C < TA < +25C +25C < TA < +70C Stereo Lamp Hysteresis Capture Range Output Voltage Shift Lamp Output Current Lamp Off to Lamp On Permissable Tuning Error Stereo to Mono Operation Short Circuit, Lamp On Lamp Off Lamp Driver Terminal Voltage Supply Current Power Supply Rejection ILAMP = 50mA Lamp Off 200Hz, 200mVrms
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
Pin Connection Diagram
Composite Input Audio Amp Output Left Load & De-Emphasis Left Output Right Output Right Load & De-Emphasis Lamp Driver GND
1 2 3 4 5 6 7 8
16 VCC 15 VCO Control 14 Loop Filter 13 Loop Filter 12 Phase Det Input 11 Pilot Monitor 10 Threshold Filter 9 Threshold Filter
16
9
.260 (6.6) Max
1
8
.785 (19.9) Max .200 (5.08) Max .245 (6.22) Min
.300 (7.62)
.100 (2.54) .700 (17.7)

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