NTE NTE7084 Datasheet

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 18–Lead DIP type package. This is a multi­functional device ideally suited for use in color television receivers aiming at high–quality picture re­production.

Functions:

D Synchronizing Separation
D Vertical Drive
D X–Ray Protection

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 Warm–Up Drift.

D Small Variation in Horizontal Oscillation Frequency
D Good Linearity and Interlace because D C 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

D Vertical Oscillation
D Horizontal AFC
D Horizontal Oscillation

Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Maximum Supply Voltage, V

Maximum Current Dissipation, I
Maximum Applied Voltage, V

CC14

CC18

11

Allowable Power Dissipation (TA ≤ +65°C), PDmax 570mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Temperature Range, T
Storage Temperature Range, T

stg

opr

–20° to +85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–55° to +125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Recommended Operating Conditions: (TA = +25°C unless otherwise specified)
Recommended Supply Voltage, V

CC14

14V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

16mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–6V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Characteristics: (TA = +25°C, V

= 12V unless otherwise specified)

CC14

Parameter Symbol Test Conditions Min Typ Max Unit

V

Current Dissipation I

CC14

V

Supply Voltage V

CC18

CC14

CC18

13.5 – 29.0 mA

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
Burst Gate Pulse Delay Time 2 (SCP) T

BR
BF

– – 0.5 µs

3.6 – 4.2 µs
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 = 33kΩ 7.2 – 8.2 V
Vertical Frequency Pull–In Range Vertical Sync 60Hz 9.0 – 11.0 Hz
Vertical Free–Running Frequency f
Supply Voltage Dependence of Vertical

VR1 = fv center 55Hz 50 – 60 Hz

v

V14 = 12V ±1V, 55Hz at 12V –0.5 – 0.5 Hz

Frequency
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

TA = –10° to +60°C –0.028 – 0.028 Hz/°C

Frequency
Vertical Driver Amplification Factor 12 – 17 dB
Horizontal AFCD.C Loop Gain +sign at V1 = 5V,

±0.6 – ±1.5 mA

–sign at V1 = 1V

Horizontal Free–Running Frequency f

fH center 15.73kHz –750 – 750 Hz

H

Horizontal Oscillation Start Voltage – – 4 V
Supply Voltage Dependence of Horizontal

Frequency

AFC Comparison

Sawtooth Wave Input

AFC Output

Time Constant Circuit

Horizontal Output

Vertical Drive

Sawtooth Wave Input

Vertical Output

Middle Point Voltage

VZ – VZ x 90% –50 – 50 Hz

Pin Connection Diagram

1
2

3

18

+V

Composite Blanking

17

Pulse Output
Video Signal Input

16

(Positive)

4
5Holddown Input
6GND

7Vertical Drive Output
8
9

15

Time Constant Circuit

14

+V

Sandcastle Pulse

13

Output
Horiz, Vert Sync

12

Signal Output
Vertical Trigger Input

11
10

Time Constant Circuit

(Horizontal)

CC18

(Vertical)

CC14