NTE731 Integrated Circuit TV Video Signal Processor Description: The NTE731 is an integrated circuit in a 16−Lead DIP type package and performs many of the functions which are often collectively referred to as the video “jungle”. This device provides keyed AGC for the tuner (forward and/or reverse) and the video IF (reverse), furnishes stripped synchronization signals in both polarities, and provides low−impedance video and noise−cancelled video output signals. The NTE731 is used as a low−cost, high−quality circuit in monochrome as well as color TV receivers. The circuit combines high performance with economy by eliminating the need for either AGC or noise threshold adjustments. Positive noise gating and high sync. separator gain assure excellent performance over a wide range of signal conditions. Features: D High−Impedance Video Input D Low−Impedance Emitter−Follower Video Output D Forward AGC for Video IF D Delayed Forward AGC for NPN Bipolar Tuner D Delayed Reverse AGC for PNP, MOSFET, or Tube Tuner D Positive and Negative Sync Outputs D Preset Noise Detector D Single−Supply Operation Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) DC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30V Device Dissipation (TA ≤ +55°C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750mW Derate Linearly Above +55°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9mW/°C Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40° to +85°C Storage Temperature Range, TS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65° to +150°C Lead Temperature (During Soldering, 1/32” (0.79mm) from case, 10sec max.) . . . . . . . . . . +265°C Electrical Characteristics: (TA = +25°C, V+ = 24V unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Supply Current (Pulse Test) IT24 20 − 40 mA AGC Threshold (Sync Tip Level at Video Input) VTH 4.5 − 5.5 V Video Input Amplitude (White Positive) V8 − 3 − VP−P Video Output Amplitude (Low Impedance) V9 − 3 − VP−P Noise Cancelled Video Output at VTH (Black Positive, Gain ≅ 2) V5 3.6 − 9.2 V VTH(SEP) 1.1 − 2.2 V Sync Input Current for Full Amplitude Outputs I$ (ON) − − 100 µA Maximum Leakage Current at Pin4 I$ (OFF) − − ±6 µA Sync Outputs: Negative Sync Low V2(L) 0 − 2.6 V Negative Sync High V2(H) 23.8 − 24.0 V Positive Sync Low V3(L) 0 − 0.2 V Positive Sync High V3(H) 20.1 − 24.0 V I11(CH) 12 − 36 mA Discharge Current I11(DISCH) 1.1 − 2.6 mA Leakage Current I11(LEAK) − − ±6 µA V16(ON) 3 − 6 V I1(ON) − 1 − mA Maximum IF Gain−Clamp Voltage V11 4.8 − 5.7 V Maximum IF Gain Bias V12 4.2 − 5.2 V V13(LOW) 0 − 3.3 V V13(HIGH) 5.7 − 6.0 V I12(OFF) − − ±6 µA Reverse AGC (FET) ON Current I14(ON) 1.8 − 5.5 mA Forward AGC (NPN) OFF Current I15(OFF) − − ±6 µA Reverse AGC (NPN) ON Current I15(ON) 4.5 − 15 mA T 1 − 63 µs AGC to Noise Separation AGC Filter: Charge Current (Pulse Test) AGC Enable: Horizontal Keying Negative Sync Input Current IF AGC Voltage: Low High Tuner Currents: Reverse AGC (FET) OFF Current Internal Noise−Lockout Time Pin Connection Diagram AGC Enable Sync Input 1 16 Horizontal Strobe Input Separated Sync Output 2 15 Positive NPN Tuner Separated Sync Output 3 14 Negative FET or PNP Tuner Sync Separator Input 4 13 AGC Output Noise Cancelled Video Output 5 12 IF Gain Bias VCC 6 11 AGC Filter Bias 7 10 GND Video Input 8 9 16 Low Z Video Output 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)