NTE NTE843

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 = +45°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4W
Derate Above TA = +45°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.3mW/°C
Thermal Resistance, Junction–to–Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75°C/W
Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +85°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Lead Temperature (During Soldering, 1/16” from case, 10sec max), TL . . . . . . . . . . . . . . . . . +265°C
Electrical Characteristics: (V+ = 12Vdc, fc = 45MHz, TA = +25°C unless otherwise specified)
Parameter
Symbol
Min
Typ
–
60
80
mA
–
–
7
V
–0.2
0.3
+0.8
V
–
7.7
–
V
2.4
3.0
3.6
V
Oscillator Pull–In Range
–
3
–
MHz
Oscillator Hold–In Range
–
6
–
MHz
Detector Conversion Gain
26
30
–
dB
Video Bandwidth
–
9
–
MHz
fc = 45MHz
–
30
–
dB
2fc = 90MHz
–
40
–
dB
Supply Current
Test Conditions
I8 + I10
Video–Output Voltage
V10
Zero Carrier Bias Adjust
Noise–Inversion Offset Voltage
V10
Referenced to Zero Carrier Level
Sound IF Take–Off Output
V9
V10 = 7V
AFT Output Voltage
V12
AFT Defeat Switch Closed
Carrier Rejection at Video
Max Unit
Video IF Parallel Input Impedance
Resistance (Pin4)
RP
–
4
–
kΩ
Video IF Parallel Input Impedance
Capacitance (Pin4)
CP
–
5
–
pF
Sound Take–Off Output Resistance (Pin9)
RO
1MHz
–
50
–
Ω
Video Output Resistance (Pin10)
RO
1MHz
–
50
–
Ω
Pin Connection Diagram
Limiter Tuning
Limiter Tuning
GND (V)
Video IF Input
APC Filter
1
2
3
4
5
16
15
14
13
12
VCO Tuning 6
VCO Tuning 7
V (+) 8
AFT Tuning
AFT Tuning
AFT Defeat
GND (V)
AFT Output
11 Zero–Carrier Bias Adjust
10 Video Output (Negative Going Sync)
9 Sound Take–Off Output
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