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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 = +25C unless otherwise specified) DC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30V Device Dissipation (TA +55C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750mW Derate Linearly Above +55C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9mW/C Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +85C Storage Temperature Range, TS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Lead Temperature (During Soldering, 1/32" (0.79mm) from case, 10sec max.) . . . . . . . . . . +265C
Electrical Characteristics: (TA = +25C, V+ = 24V unless otherwise specified)
Parameter Supply Current (Pulse Test) AGC Threshold (Sync Tip Level at Video Input) Video Input Amplitude (White Positive) Video Output Amplitude (Low Impedance) Noise Cancelled Video Output at VTH (Black Positive, Gain 2) AGC to Noise Separation Sync Input Current for Full Amplitude Outputs Maximum Leakage Current at Pin4 Sync Outputs: Negative Sync Low Negative Sync High Positive Sync Low Positive Sync High AGC Filter: Charge Current (Pulse Test) Discharge Current Leakage Current AGC Enable: Horizontal Keying Negative Sync Input Current Maximum IF Gain-Clamp Voltage Maximum IF Gain Bias IF AGC Voltage: Low High Tuner Currents: Reverse AGC (FET) OFF Current Reverse AGC (FET) ON Current Forward AGC (NPN) OFF Current Reverse AGC (NPN) ON Current Internal Noise-Lockout Time Symbol IT24 VTH V8 V9 V5 VTH(SEP) I$ (ON) I$ (OFF) V2(L) V2(H) V3(L) V3(H) I11(CH) I11(DISCH) I11(LEAK) V16(ON) I1(ON) V11 V12 V13(LOW) V13(HIGH) I12(OFF) I14(ON) I15(OFF) I15(ON) T Test Conditions Min 20 4.5 - - 3.6 1.1 - - 0 23.8 0 20.1 12 1.1 - 3 - 4.8 4.2 0 5.7 - 1.8 - 4.5 1 Typ - - 3 3 - - - - - - - - - - - - 1 - - - - - - - - - Max 40 5.5 - - 9.2 2.2 100 6 2.6 24.0 0.2 24.0 36 2.6 6 6 - 5.7 5.2 3.3 6.0 6 5.5 6 15 63 Unit mA V VP-P VP-P V V A A V V V V mA mA A V mA V V V V A mA A mA s
Pin Connection Diagram
AGC Enable Sync Input Separated Sync Output Separated Sync Output Sync Separator Input Noise Cancelled Video Output VCC Bias Video Input
1 2 3 4 5 6 7 8
16 Horizontal Strobe Input 15 Positive NPN Tuner 14 Negative FET or PNP Tuner 13 AGC Output 12 IF Gain Bias 11 AGC Filter 10 GND 9 Low Z Video Output
16
9
.260 (6.6) Max
1
8
.785 (19.9) Max .200 (5.08) Max .245 (6.22) Min .100 (2.54) .700 (17.7)
.300 (7.62)

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