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| NTE790 Integrated Circuit Dual Chroma Demodulator Description: The NTE790 has two sets of synchronous detectors with matrix circuits to achieve the R-Y, G-Y and B-Y color difference output signals. The chroma input signal is applied to Pin3 and Pin4 while the oscillator injection signal is applied to Pin6 and Pin7. The color difference signals, after matrix, have a fixed relationship of amplitude and phase nominally equal DC voltage levels. The outputs of the NTE790 are suitable for driving high level color difference or R, G, B output amplifiers. Emitter-follower output stages used to drive the high level color amplifiers have short-circuit protection. Absolute Maximum Rating: (TA = +25C unless otherwise specified) DC Supply Voltage (Pin8 to Pin14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27V Reference Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Vp-p Chroma Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Vp-p Total Device Dissipation (Up to TA = +70C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530mW Derate Above TA = +70C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.7mW/C Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +85C Storage Temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Lead Temperature (During Soldering, 1/32" from seating plane, 10sec max), TL . . . . . . . . . +265C Electrical Characteristics: (TA = +25C and V+ = 24V unless otherwise specified) Parameter Static Characteristics Supply Current With Output Loads With No Output Loads G-Y, R-Y, B-Y Outputs Chroma Inputs Reference Subcarrier Demodulator Unbalance Maximum Color Difference Output Voltage IT S1 Closed S1 Open V9, V11, V13 S1 Closed V3, V4 V6, V7 V13 V11 V9 S1 Open S1 Open V3 = v4 = 0.6Vp-p 16.5 - - 9 26.5 - mA mA V V V Vp-p Vp-p Vp-p Vp-p Symbol Test Conditions Min Typ Max Unit 13.2 14.7 15.8 - - - 8.0 5.5 1.2 3.3 6.2 - - - - - - 0.8 - - - V9, V11, V13 V3 = V4 = 0 Electrical Characteristics (Cont'd): (TA = +25C and V+ = 24V unless otherwise specified) Parameter Chroma Input Sensitivity Relative R-Y Output Relative G-Y Output VDC Difference Between any two Output Pins Input Impedance Reference Subcarrier Input Capacitance Reference Subcarrier Input Impedance at Chroma Inputs Input Capacitance at Chroma Inputs Output Resistance Symbol V3 V11 V9 |V9|-|V13| ri6, 7 ci6, 7 ri3, 4 ci3, 4 ro Pin Connection Diagram ec = 0 Test Conditions Adjust ec for 5V @ Pin13 (B-Y) Min - 3.5 0.75 - - - - - - Typ 0.2 - - - 1.7 6 0.95 6 180 Max Unit 0.35 Vp-p 4.2 Vp-p V k pF k pF 1.25 Vp-p 0.6 - - - - - N.C. N.C. (-) Chroma (+) Chroma N.C. R - Y Injection B - Y Injection 1 2 3 4 5 6 7 14 GND 13 B - Y Output 12 N.C. 11 R - Y Output 10 N.C. 9 8 G - Y Output VCC 14 8 1 7 .785 (19.95) Max .200 (5.08) Max .300 (7.62) .100 (2.45) .600 (15.24) .099 (2.5) Min |
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