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 70°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3mW/°C Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +85°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Electrical Characteristics: (TA = +25°C, VCC = +12V, Composite Input = 300mVrms (L = R, Pilot OFF), Pilot Level = 30mVrms, fm = 400Hz or 1KHz, unless otherwise indicated) Test Conditions Characteristics Min Typ Max Unit Input Impedance Pin2 2 353 – kΩ Output Impedance Pin4 or Pin5 – 50 – Ω 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 kΩ VCO Frequency Drift –20°C < TA < +25°C – ±0.5 ±2.0 % +25°C < TA < +70°C – ±0.5 ±2.0 % 3.0 6.0 – dB Stereo Lamp Hysteresis Lamp Off to Lamp On 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 Pin Connection Diagram Composite Input 1 16 VCC Audio Amp Output Left Load & De–Emphasis Left Output 2 15 VCO Control 3 14 Loop Filter 4 13 Loop Filter Right Output 5 12 Phase Det Input Right Load & De–Emphasis Lamp Driver 6 11 Pilot Monitor 7 10 Threshold Filter GND 8 9 16 Threshold Filter 9 .260 (6.6) Max 1 8 .300 (7.62) .785 (19.9) Max .200 (5.08) Max .245 (6.22) Min .100 (2.54) .700 (17.7)