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User Manual: Datasheets LA7851.

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Ordering number:ENN1775A

Monolithic Linear IC

LA7851
CRT Display Synchronization
Deflection Circuit
Overview

Package Dimensions

The LA7851 is a sync deflection circuit IC dedicated to
CRT display use. It can be connected to the LA7832, 7833
(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 LA7851
contains these peripherals on chip, has a wide vertical pullin range of 20Hz, and adopts a stable circuit for horizontal
oscillation from 15kHz to 100kHz aiming at improving the
characteristics requierd for CRT display use.

unit:mm
3021C-DIP20
24.0
11

0.25

7.62
6.4

20

1

10
1.0

0.51min (3.25)
3.3 3.9max

Features

[LA7851]

(0.57)

2.54

0.5

1.2

• The vertical pull-in range 20Hz permits non-adjusting at
vertical sync 50Hz/60Hz.
• The horizontal oscillation frequency can be adjusted stably from 15kHz to 100kHz.
• 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 linearity because DC bias at vertical output stage is
subject to sampling control within retrace time.

SANYO : DIP20

On-Chip Functions
[Horizontal Block]
[Vertical Block]
• AFC
• Vertical OSC
• Horizontal OSC
• Vertical sawtooth wave generator
• X-ray protector
• Sampling type DC voltage control
• Horizontal phase shift
• AFC sawtooth wave generator
• Horizontal pulse duty setting

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.
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.

SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
O2500TN (KT)/N218TA/4015MW/6114KI, TS No.1775–1/4

LA7851
Specifications
Maximum Ratings at Ta = 25˚C
Parameter
Maximum supply voltage
Allowable power dissipation

Symbol

Conditions

Ratings

V10, V20 max

Pd max

Ta≤65˚C

Unit
14

V

780

mW

Operating temperature

Topr

–20 to +85

˚C

Storage temperature

Tstg

–55 to +125

˚C

Operating Conditions at Ta = 25˚C
Parameter
Recommended supply voltage
Operating voltage range
Recommended vertical pulse input peak value
Operating vertical pulse input peak value range
Recommended horizontal pulse input peak
value
Operating horizontal pulse input peak value
range

Symbol

Conditions

Ratings

V10, V20

Unit
12.0

V

V10, V20 op

9 to 13.5

V

VPULSE
VPULSE

5.0

Vp-p

2.0 to 6.0

Vp-p

HPULSE

5.0

Vp-p

HPULSE

2.0 to 6.0

Vp-p

Operating Characteristics at Ta = 25˚C, V11, V22=12V
Parameter

Symbol

Conditions

Ratings
min

typ

max

Unit

VCC10 current drain

I10

12

30

mA

VCC20 current drain

I20

5

12

mA

21.0

23.0

Hz

50

60

Hz

–0.1

+0.1

Hz

3.8

4.4

V

Vertical frequency pull-in range

Vertical sync 60Hz

Vertical free-running frequency

VP IN
fV

Increased/reduced voltage characteristic of
vertical frequency

∆fVV

V22=12±1V, 55Hz at 12V

fV center 55Hz

Midpoint control threshold level
Vertical OSC start voltage

fv,st
Ta=–10 to +60˚C

Temparature characteristic of vertical frequency
Vertical driver amplification factor
Horizontal AFC DC loop gain
Horizontal free-running frequency

4.0

Gv
IAFC

–0.028

+0.028

V
Hz/˚C

12

18

dB

±0.85

±1.6

mA

–750

+750

Hz

4.0

V

fH
fH, st

fH center 15.734kHz

Horizontal OSC start voltage
Increased/reduced voltage characteristic of
horizontal frequency

∆fH, V

V11=12±1V, 15.734kHz at 12V

–50

+50

Hz

5s. to 30min. after application of power

–50

+50

Hz

Ta=–10 to +60˚C

–2.9

+2.9

Hz/˚C

6.0

12.0

mA

V10=12±1V

–0.5

+0.5

%/V

Ta=–10 to +60˚C

–0.1

+0.1

%/˚C

V10=12±1V

–1.0

+1.0

%/V

–0.13

+0.13

%/˚C

9.9

11.5

µs

V10=12±1V

–1.5

+1.5

%/V

Ta=–10 to +60˚C

–0.2

+0.2

%/˚C

Horizontal OSC warm-up drift

∆fH

Temperature characteristic of horizontal
frequency
Horizontal output drive current

I12

Increased/reduced voltage characteristic of
phase shifter delay time
Temperature characteristic of phase shifter
delay time
Increased/reduced voltage characteristic of
phase shifter delay time
Temperature characteristic of phase shifter
pulse width

Ta=–10 to +60˚C

AFC phase comparison center time

15.734kHz after F.B.P. input

Increased/reduced voltage characteristic of AFC
phase comparison center time
Temperature characteristic of AFC phase
comparison center time
Comparison waveform generating input
operation voltage

V4

0.6

0.9

V

pin 13 voltage at hold-down operation start

V13

0.5

0.8

V

No.1775–2/4

LA7851
Equivalent Circuit Block Diagram

Sample Application Circuit : 14” Color Monitor/fV=60Hz, fH=15.734kHz

No.1775–3/4

LA7851

Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer's
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer's products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products(including technical data,services) described or
contained herein are controlled under any of applicable local export control laws and regulations,
such products must not be expor ted without obtaining the expor t license from the authorities
concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"
for the SANYO product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not
guaranteed for volume production. 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 October, 2000. Specifications and information herein are subject
to change without notice.
PS No.1775–4/4

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