NTE1655 Integrated Circuit TV Stereo Decoder Description: The NTE1655 is a TV stereo decoder integrated circuit in a 16–Lead DIP type package designed for television stereo. An L–R output is provided to drive further audio processing. Features: D Low Impedance L + R and L – R Outputs D Mono/Stereo Switching and Indication D Low Distortion – 0.10% typical Applications: D Stereo Television Sets D Stereo Adapters D Cable Television Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Power Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1800mW Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mW/°C Operating Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +85°C Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Lamp Drive Voltage Max Voltage at Pin7 with Lamp “Off” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V Lamp Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA Electrical Characteristics: (TA = +25°C, VCC = 12V unless otherwise specified) Parameter Test Conditions Min Typ Max Unit DC (VIN = 0) Supply Current VCC = 16V 15.0 33.5 50.0 mA Output Voltage Pin4 1.7 3.5 5.0 V Pin5 1.7 3.8 5.0 V Output Impedance Pin4, Pin5 – 100 300 W Lamp Leakage Lamp OFF, Pin7 Voltage = 16V – – 0.1 mA Lamp Saturation Voltage Lamp ON, Pin7 Current = 100mA – – 2.0 V Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 12V unless otherwise specified) Parameter Test Conditions Min Typ Max Unit Audio (Composite signal with 38kHzsubcarrier and 10% 19kHz pilot, fmod = 1kHz. Adjust P1 for 19kHz ±10Hz. L + R Channel Gain VIN = 2.5VP–P L = R, Pilot OFF, Pin4 0.8 1.0 1.2 L + R Channel THD VIN = 2.5VP–P L = R, Pilot OFF, Pin4 – 0.1 1.0 % Gain Ratio, L + R Channel to L – R Channel VIN = 2.5VP–P, L Only –2.0 0.0 2.0 dB Supply Rejection 100mVrms, 1kHz ON Supply, VIN = 0 30 60 – dB DC Output Shift, Mono–to–Stereo Pilot OFF to ON, Pin4, Pin5 – – ±20 mV Input Impedance Pin1 15 50 150 k Pilot Level for Lamp ON 12 – 20 mV Pilot Level for Lamp OFF 3 – 10 mV ±0.5 – – % PLL Capture Range Pilot = 25mVrms Pin Connection Diagram Composite Input 0.0082µF to Pin12 L + R Feedback L + R Input L – R Feedback L – R Output Stereo Indicator LED GND 1 2 3 4 5 6 7 8 16 16 15 14 13 12 11 10 9 VCC VCO Adjust Phase Detector Filter Phase Detector Filter To Pin2 15.734kHz Monitor Stereo/Mono Switch Stereo/Mono Switch 9 .260 (6.6) Max 1 8 .785 (19.9) Max .300 (7.62) .200 (5.08) Max .245 (6.22) Min .100 (2.54) .700 (17.7)