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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 +60C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +125C Electrical Characteristics: (TA = +25C, V11-13 = 12V, f = 38.9MHz unless otherwise specified)
Parameter Supply Voltage Range IF Input Voltage for Onset of AGC (RMS Value) Differential Input Impedance Zero-Signal Output Level Top Sync Output Level IF Voltage Gain Control Range Bandwidth of Video Amplifier Symbol V11-13 V1-16(rms) |Z1-16| V12-13 V12-13 GV B 3dB In parallel with 2pF Note 1 Test Conditions Min 10.2 - - - 2.9 - - Typ 12.0 100 2 6 0.3 3.07 64 6 Max 13.2 150 - - 3.2 - - Unit V V k V V dB MHz
Note 1. So-called "Projected Zero Point", e.g. with switched demodulator.
Electrical Characteristics (Cont'd): (TA = +25C, V11-13 = 12V, f = 38.9MHz unless otherwise specified)
Parameter Signal-to-Noise Ratio Differential Gain Differential Phase Intermodulation, Blue Intermodulation, Yellow Intermodulation Carrier Signal at Video Output 2nd Harmonic of Carrier at Video Output White Spot Inverter Threshold Level White Spot Insertion Level Noise Inverter Threshold Level Noise Insertion Level External Video Switch (VCR) Switched Off Tuner AGC Output Current Range Tuner AGC Output Voltage Tuner AGC Output Leakage Current Maximum AFC Output Voltge Swing Detuning for AFC Output Voltage Swing AFC Zero-Signal Output Voltage (Minumum Gain) AFC Switches ON AFC Switches OFF V14-13 I4 V4-13 I4 V5-13 f V5-13 V6-13 V6-13 of 10V I4 = 10mA V14-13 = 11V, V4-13 = 12V 3.3MHz, Note 4 1.1MHz, Note 3 Symbol S/N dG Test Conditions Vi = 10mV, Note 2 Min - - - - - - - - - - - - - 0 - - 10 - 4 3.2 - Typ 58 4 2 46 46 46 4 20 6.6 4.7 1.8 3.8 - - - - 11 100 6 - - Max - 10 10 60 50 54 30 30 - - - - 1.1 10 0.3 15 - 200 8 - 1.5 Unit dB % deg. dB dB dB mV mV V V V V V mA V A V kHz V V 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 AGC Output 4 AFC Output 5 AFC Switch Input 6 AFC Tank (Sync) 7 AFC Tank (Amp) 8
16 IF Input 15 Coupling Cap 14 AGC Filter 13 GND 12 Video Output 11 VCC 10 AFC Tank (Sync) 9 AFC Tank (Amp)
16
9
1
8
.870 (22.0) Max .200 (5.08) Max
.260 (6.6) Max
.100 (2.54) .700 (17.78)
.099 (2.5) Min

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