NTE7084
Integrated Circuit
Color TV Sync Deflection Circuit
Description:
The NTE7084 is an IC containing not only the main functions required to achieve synchronization and
deflection in color television receivers but also a generator of horizontal, vertical blanking pulses, and
a generator of burst gate pulses (sandcastle type) in an 18Lead DIP type package. This is a multi-
functional device ideally suited for use in color television receivers aiming at highquality picture re-
production.
Functions:
D
Synchronizing Separation
D
Vertical Drive
D
XRay Protection
D
Vertical Oscillation
D
Horizontal AFC
D
Horizontal Oscillation
D
Sandcastle Pulse (Burst Gate Pulse + Horizontal Blanking Pulse)
D
Composite Blanking Pulse (Vertical + Horizontal Blanking Pulse)
Features:
D
Horizontal and Vertical Oscillations are Stable Against Variations in Ambient Temperature and
Supply Voltage due to Small WarmUp Drift.
D
Small Variation in Horizontal Oscillation Frequency
D
Good Linearity and Interlace because DC Bias at Vertical Output Stage is Subjected to Sampling
Control Within Retrace Time.
D
Vertical Blanking Pulse Width can be set freely by Peripheral Parts.
D
Minimized Picture Distortion because AFC Circuit is Defeated During Vertical Trigger Pulse Input
Period.
D
Multifunctional and Compact
Absolute Maximum Ratings: (T
A
= +25
C unless otherwise specified)
Maximum Supply Voltage, V
CC14
14V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Current Dissipation, I
CC18
16mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Applied Voltage, V
11
6V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Allowable Power Dissipation (T
A
+65
C), P
D
max
570mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
20
to +85
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
55
to +125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions: (T
A
= +25
C unless otherwise specified)
Recommended Supply Voltage, V
CC14
12V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (T
A
= +25
C, V
CC14
= 12V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
V
CC14
Current Dissipation
I
CC14
13.5
29.0
mA
V
CC18
Supply Voltage
V
CC18
11.8
13.2
V
Zener Bias Minimum Current
13
mA
Sync Separator Input DC Level
9.0
9.6
V
Sync Signal Peak Value
9.5
11.5
V
Burst Gate Pulse Peak Value (SCP)
9.5
11.5
V
Burst Gate Pulse Delay Time 1 (SCP)
T
BR
0.5
s
Burst Gate Pulse Delay Time 2 (SCP)
T
BF
3.6
4.2
s
Horizontal Blanking Pulse Peak Value (SCP)
2.7
3.3
V
Horizontal Blanking Pulse Peak Value (CBP)
I = 1mA
12.7
13.5
V
Vertical Blanking Pulse Peak Value (CBP)
Load Resistance R = 33k
7.2
8.2
V
Vertical Frequency PullIn Range
Vertical Sync 60Hz
9.0
11.0
Hz
Vertical FreeRunning Frequency
f
v
V
R1
= f
v
center 55Hz
50
60
Hz
Supply Voltage Dependence of Vertical
Frequency
V14 = 12V
1V, 55Hz at 12V
0.5
0.5
Hz
Middle Point Control Threshold Level
3.8
4.4
V
Vertical Blanking Threshold Level
5.0
5.7
V
Vertical Oscillation Start Voltage
4
V
Temperature Characteristic of Vertical
Frequency
T
A
= 10
to +60
C
0.028
0.028
Hz/
C
Vertical Driver Amplification Factor
12
17
dB
Horizontal AFCD.C Loop Gain
+sign at V
1
= 5V,
sign at V
1
= 1V
0.6
1.5
mA
Horizontal FreeRunning Frequency
f
H
f
H
center 15.73kHz
750
750
Hz
Horizontal Oscillation Start Voltage
4
V
Supply Voltage Dependence of Horizontal
Frequency
V
Z
V
Z
x 90%
50
50
Hz
+V
CC14
(Vertical)
+V
CC18
(Horizontal)
Pin Connection Diagram
Vertical Trigger Input
Horiz, Vert Sync
1
2
3
4
AFC Comparison
AFC Output
Time Constant Circuit
Horizontal Output
5
Holddown Input
6
GND
7
Vertical Drive Output
8
Vertical Drive
18
17
16
15
Composite Blanking
Video Signal Input
Time Constant Circuit
14
13
Sandcastle Pulse
12
11
Time Constant Circuit
9
Vertical Output
10
Middle Point Voltage
Sawtooth Wave Input
Sawtooth Wave Input
Pulse Output
(Positive)
Output
Signal Output
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