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NTE843 Integrated Circuit TV Video IF Phase Locked Loop (PLL) Synchronous Detector
Description: The NTE843 is a linear IC synchronous detector employing a phase-locked oscillator to demodulate the 45.75MHz video IF signals in color-TV receivers. The NTE843 features AFT voltage for DC control of the tuner; an adjustment for the zero-carrier DC level at the video output terminal; an amplifier arrangement for inverting noise impulses toward the black level; and a separate output terminal (non- inverting) for the sound IF. The NTE843 is supplied in a 16-lead plastic "power-slab" dual-in-line package. The "power-slab" package has an inherently low junction-to-case (slab) thermal resistance and lends itself to a wide variety of heat-sink methods, depending on the application requirements. Features: D PLL Carrier Oscillator with Wide Pull-In and Hold-In Range D Excellent Low-Level Detector Linearity D Noise Inversion at Video Output D Wide Range, Variable Zero-Carrier Level Adjustment D Automatic Fine Tuning (AFT) Detector D Separate Output for Sound Take-Off D 12V Power Supply Absolute Maximum Ratings: Power Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V Power Supply Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA Input Signal Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Vrms Device Dissipation (Up to TA = +45C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4W Derate Above TA = +45C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.3mW/C Thermal Resistance, Junction-to-Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75C/W Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +85C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Lead Temperature (During Soldering, 1/16" from case, 10sec max), TL . . . . . . . . . . . . . . . . . +265C
Electrical Characteristics: (V+ = 12Vdc, fc = 45MHz, TA = +25C unless otherwise specified)
Parameter Supply Current Video-Output Voltage Noise-Inversion Offset Voltage Sound IF Take-Off Output AFT Output Voltage Oscillator Pull-In Range Oscillator Hold-In Range Detector Conversion Gain Video Bandwidth Carrier Rejection at Video Video IF Parallel Input Impedance Resistance (Pin4) Video IF Parallel Input Impedance Capacitance (Pin4) Sound Take-Off Output Resistance (Pin9) Video Output Resistance (Pin10) fc = 45MHz 2fc = 90MHz RP CP RO RO 1MHz 1MHz Symbol I8 + I10 V10 V10 V9 V12 Zero Carrier Bias Adjust Referenced to Zero Carrier Level V10 = 7V AFT Defeat Switch Closed Test Conditions Min - - -0.2 - 2.4 - - 26 - - - - - - - Typ 60 - 0.3 7.7 3.0 3 6 30 9 30 40 4 5 50 50 Max Unit 80 7 +0.8 - 3.6 - - - - - - - - - - mA V V V V MHz MHz dB MHz dB dB k pF
Pin Connection Diagram Limiter Tuning Limiter Tuning GND (V) Video IF Input APC Filter 1 2 3 4 5 16 15 14 13 12 AFT Tuning AFT Tuning AFT Defeat GND (V) AFT Output
VCO Tuning 6 VCO Tuning 7 V (+) 8 16 9
11 Zero-Carrier Bias Adjust 10 Video Output (Negative Going Sync) 9 Sound Take-Off Output
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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