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| NTE1174 Integrated Circuit TV Automatic Fine Tuning (AFT) Circuit Description: The NTE1174 is a monolithic TV Automatic Fine Tuning (AFT) circuit in a 14-Lead Staggered DIP type package that provides an AFT voltage and an amplified 4.5MHz intercarrier sound signal. When connected to an output of an IF amplifier the NTE1174 provides the signal processing (amplification and detection) necessary to generate the AFT correction signals required by the TV tuner. It also mixes the video and sound IF carriers and amplifiers the resultant 4.5MHz intercarrier sound signal. The sound output may then be connected to an FM detector such as the NTE1175 "TV Sound IF and Audio Output Subsystem," or the NTE712 "FM Detector and Audio Driver." The AFT portion of the NTE1174 is similar the NTE 780 AFT circuit with the following exceptions: (a) the AFT filter capacitors are external and user selectable, allowing the detector to operate as a peak detector and resulting in a higher effective gain for the TV signal; (b) the detector bias resistor is external and user selectable, allowing the gain of the AFT and intercarrier signals to be adjusted; (c) the dynamic resistance of the shunt regulator has been decreased. Absolute Maximum Ratings: Device Dissipation (TA +55C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 630mW Derate Linearly Above +55C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.67mW/C Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +85C Storage Temperatuere Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Lead Temperature (During Soldering, 1/16" from case, 10sec max), TL. . . . . . . . . . . . . . . . . +265C Electrical Characteristics: (TA = +25C, V+ = 28V unless otherwise specified) Parameter No Signal Input Supply Current, I+ Low Voltage at Pin7 Shunt Regulator Voltage Quiescent Voltage at Pin3 Quiescent Voltage at Pin13 and Pin14 Quiescent Voltage at Pin6 Pin13 connected to Pin14, Note 2 V+ = 20.8V, Note 1 15 11.0 12.0 4.5 6.0 1.4 - - - - - - 20 14.5 14.5 10 8.5 2.6 mA V V V V V Test Conditions Min Typ Max Unit Note 1. I7 = 12mA maximum at V7 = 11V. Note 2. V13 = 0.55 VZ 0.7V. Electrical Characteristics (Cont'd): (TA = +25C, V+ = 28V unless otherwise specified) Parameter Correction Voltage at Pin13 Test Conditions f = 44.65MHz f = 45.69MHz f = 45.81MHz f = 46.85MHz Correction Voltage at Pin14 f = 44.65MHz f = 45.69MHz f = 45.81MHz f = 46.85MHz 4.5MHz Output Two-Tone Input, f1 = 45.75MHz at 15mV, f2 = 41.25MHz at 5mV Min 2.2 1.2 9.6 9.1 9.1 9.6 1.2 2.2 50 Typ - - - - - - - - - Max 4.7 4.4 13.8 12.1 12.1 13.8 4.4 4.7 200 Unit V V V V V V V V mVRMS Signal Input = 15mVRMS (Note 3, unless otherwise specified) Note 3. Resistor from Pin6 to Pin7 = 9.09k. Crossover sttepens and "bow-tie" width increases when resistor is decreased in value. Total peak swing decreases slightly. Pin Connection Diagram N.C. N.C. Intercarrier Output Substrate IF Input Detector Bias Zener 1 2 3 4 5 6 7 14 DC Amp B Output 13 DC Amp A Output 12 Filter A 11 Filter B 10 Detector B Input 9 8 IF Amp Input Detector A Input 14 8 .260 (6.6) Max 1 7 .770 (19.5) Max .300 (7.62) .200 (5.08) Max .100 (2.54) .025 (0.64) .600 (15.24) .100 (2.54) Max .200 (5.08) .400 (10.16) |
Price & Availability of NTE1174
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