NTE1785 Integrated Circuit TV IF Amp w/Demod and AFC (For PNP Tuners) Description: The NTE1785 is an IF amplifier and demodulator circuit in a 16–Lead DIP type package designed for use in color and black and white television receivers using PNP tuners. Features: D Gain–Controlled Wide–Band Amplifier Providing Complete IF Gain D Synchronous Demodulator D White Spot Inverter D Video Preamplifier with Noise Protection D AFC Circuit which can be Switched ON/OFF by a DC Level (e.g. During Tuning) D AGC Circuit with Noise Gating D Tuner AGC Output (PNP Tuners) D VCR Switch which Switches Off the Video Output (e.g. For Insertion of a VCR Playback Signal) Absolute Maximum Ratings: Supply Voltage, V11–13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2V Tuner AGC Voltage, V4–13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V Total Power Dissipation, Ptot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900mW Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25° to +60°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +125°C Electrical Characteristics: (TA = +25°C, V11–13 = 12V, f = 38.9MHz unless otherwise specified) Parameter Supply Voltage Range IF Input Voltage for Onset of AGC (RMS Value) Symbol Test Conditions Min Typ Max Unit V11–13 10.2 12.0 13.2 V V1–16(rms) – 100 150 µV Differential Input Impedance |Z1–16| In parallel with 2pF – 2 – kΩ Zero–Signal Output Level V12–13 Note 1 – 6 ±0.3 – V Top Sync Output Level V12–13 2.9 3.07 3.2 V GV – 64 – dB – 6 – MHz IF Voltage Gain Control Range Bandwidth of Video Amplifier B 3dB Note 1. So–called “Projected Zero Point”, e.g. with switched demodulator. Electrical Characteristics (Cont’d): (TA = +25°C, V11–13 = 12V, f = 38.9MHz unless otherwise specified) Parameter Symbol Min Typ Max Unit – 58 – dB – 4 10 % – 2 10 deg. – 46 60 dB – 46 50 dB – 46 54 dB Carrier Signal at Video Output – 4 30 mV 2nd Harmonic of Carrier at Video Output – 20 30 mV White Spot Inverter Threshold Level – 6.6 – V White Spot Insertion Level – 4.7 – V Noise Inverter Threshold Level – 1.8 – V Noise Insertion Level – 3.8 – V V14–13 – – 1.1 V I4 0 – 10 mA I4 = 10mA – – 0.3 V V14–13 = 11V, V4–13 = 12V – – 15 µA 10 11 – V – 100 200 kHz Signal–to–Noise Ratio S/N Differential Gain dG Test Conditions Vi = 10mV, Note 2 Differential Phase Intermodulation, Blue 1.1MHz, Note 3 Intermodulation, Yellow Intermodulation 3.3MHz, Note 4 External Video Switch (VCR) Switched Off Tuner AGC Output Current Range Tuner AGC Output Voltage V4–13 Tuner AGC Output Leakage Current I4 Maximum AFC Output Voltge Swing ∆V5–13 Detuning for AFC Output Voltage Swing ∆f of 10V AFC Zero–Signal Output Voltage (Minumum Gain) V5–13 4 6 8 V AFC Switches ON V6–13 3.2 – – V AFC Switches OFF V6–13 – – 1.5 V Note 2. S/N = VO black–to–white/Vn(rms) at B = 5MHz. Note 3. 20 log (VO at 4.4MHz/VO at 1.1MHz) + 3.6dB. Note 4. 20 log (VO at 4.4MHz/VO at 3.3MHz) Pin Connection Diagram IF Input 1 Coupling Cap 2 AGC Delay Input 3 16 IF Input 15 Coupling Cap 14 AGC Filter AGC Output 4 13 GND AFC Output 5 12 Video Output AFC Switch Input 6 11 VCC AFC Tank (Sync) 7 10 AFC Tank (Sync) AFC Tank (Amp) 8 9 AFC Tank (Amp) 16 9 1 8 .870 (22.0) Max .260 (6.6) Max .200 (5.08) Max .100 (2.54) .700 (17.78) .099 (2.5) Min