LA7852 Sanyo Semiconductor Corporation, LA7852 Datasheet

LA7852

Manufacturer Part Number

LA7852

Description

CTR display synchronization deflection circuit

Manufacturer

Sanyo Semiconductor Corporation

Datasheet

1.LA7852.pdf (6 pages)

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Overview

The LA7852 is a sync-deflection circuit IC dedicated to CRT

display use. It can be connected to the LA7832/7833, 7837/

7838 (for vertical output use) to form a sync-deflection circuit

that meets every requirement for CRT display use.

So far, ICs for color TV use have been applied to the sync-

deflection circuit for CRT display use, and general-purpose ICs

such as one-shot multivibrator, inverter and a lot of transistors

have been used to form the peripherals such as sync input

interface, horizontal phase shifter. The LA7852 contains these

peripherals on chip and adopts a stable circuit for horizontal

oscillation from 15 kHz to 100 kHz aiming at improving the

characteristics required for CRT display use.

The LA7852 has independent GND pins for the horizontal

block and vertical block, thus facilitating pattern layout for

applications where the LA7852 is used at high frequencies.

Features

Ordering number: EN2781B

The vertical pull-in range is approximately 10 Hz at

fv = 60 Hz.

The horizontal oscillation frequency can be adjusted stably

from 15 kHz to 100 kHz.

The horizontal display can be shifted right/left.

The horizontal/vertical sync input can be used intact

regardless of the difference in pulse polarity and pulse width.

The AFC feedback sawtooth wave can be obtained by

simply applying a flyback pulse to the IC as a trigger pulse.

Any duty of the horizontal pulse can be set.

Good vertical linearity because DC bias at vertical output

stage is subjected to sampling control within retrace time.

Excellent interlace and vertical jitter characteristics on the

high-definition display because of independent GND pins for

the horizontal block and vertical block.

SANYO assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other

parameters) listed in products specifications of any and all SANYO products described or contained

herein.

Any and all SANYO products described or contained herein do not have specifications that can handle

applications that require extremely high levels of reliability, such as life-support systems, aircraft’s

control systems, or other applications whose failure can be reasonably expected to result in serious

physical and/or material damage. Consult with your SANYO representative nearest you before using

any SANYO products described or contained herein in such applications.

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

SANYO Electric Co.,Ltd. Semiconductor Company

CRT Display Synchronization Deflection Circuit

Package Dimensions

unit : mm

3059-DIP22S

0.95

81096HA(II)/9138YT/8228YT,TS No.2781-1/6

Ambient temperature, Ta – °C

0.48

21.2

[LA7852]

Pd max – Ta

1.78

Monolithic Linear IC

1.7

SANYO : DIP22S

LA7852

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LA7852 Summary of contents

Page 1

... Ordering number: EN2781B Overview The LA7852 is a sync-deflection circuit IC dedicated to CRT display use. It can be connected to the LA7832/7833, 7837/ 7838 (for vertical output use) to form a sync-deflection circuit that meets every requirement for CRT display use. So far, ICs for color TV use have been applied to the sync- ...

Page 2

... Horizontal AFC DC loop gain I Horizontal free-running frequency Horizontal OSC start voltage Increased/reduced voltage characteristic of horizontal frequency Horizontal OSC warm-up drift Temperature characteristic of horizontal frequency Horizontal output drive current LA7852 [Vertical Block] . Vertical OSC . Vertical sawtooth wave generator . Sampling type DC voltage control Symbol Conditions ...

Page 3

... Increased/reduced voltage characteristic of AFC phase comparison center time Temperature characteristic of AFC phase comparison center time Comparison waveform generating input operation voltage Pin 14 voltage at hold-down operation start Equivalent Circuit Block Diagram LA7852 Conditions –10 to +60° –10 to +60°C 15.734 kHz after FBP input ...

Page 4

... Sample Application Circuit 14’’ Color Monitor / Hz 15.734 kHz Negative pulse mode VR2 is fixed after adjustment. LA7852 (Note) For the LA7853, the vertical pull-in range vertical sync 60 Hz. Unit (resistance: (Note connected when oscillation occurs in vertical output in Sample Application Circuit. , capacitance: F) ...

Page 5

... VR2 is fixed after adjustment LA7850 Family Type Number Package Differences in Vertical characteristics pull-in range ( Hz) Ground pin LA7852 LA7850 LA7851 DIP-20S DIP-20S (Slim Type) (Slim Type Horizontal/vertical horizontal/vertical common common A05903 LA7852 LA7853 DIP-22S DIP-22S (Shrink Type) (Shrink Type Horizontal/vertical Horizontal/vertical separated separated No.2781-5/6 ...

Page 6

... SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of August, 1996. Specifications and information herein are subject to change without notice. LA7852 PS No.2781-6/6 ...

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