Sanyo LA7938 Specifications

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.

Monolithic Linear IC

Electronic Channel Select

System Control Circuit for TV/VCR Use

Ordering number:ENN2843

LA7938

SANYO Electric Co.,Ltd. Semiconductor Company

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

Overview

The SANYO LA7938 monolithic linear TV/VCR electronic
tuner system controller IC integrates all the peripheral cir­cuitry for a TV or VTR tuner, with the exception of the
microcontroller, into a single chip.
It incorporates a 2-input/4-output band-switch, 5.0V and

5.75V voltage regulators, comparator, sync signal process­ing circuit, AFT DC shift circuit and constant current cir­cuit. Each PNP output of the band-switch circuit typically
sources 40mA, eliminating the need for external current
drivers.
The LA7938 operates from a recommended supply volt­age range of 8.7 to 12.5V. It is available in 22-pin shrink
DIPs.

Features

• Integrates all tuner peripheral circuits except controller.

• Band-switch outputs source up to 40mA.

• Regulators each supply up to 50mA.

• 22-pin shrink DIP.

Specifications

Maximum Ratings at Ta = 25˚C

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V

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I91xam 05–Am
I02xam 05–Am
I12xam 05–Am
I22xam 05–Am
V6xam 5.3V
V5xam 5.3V

Ta≤65˚C

xam 31V

Package Dimensions

unit:mm

3059-DIP22S

[LA7938]

22 12

6.4

7.62

111

0.95 0.48

21.2

1.78

3.25

3.9max

3.3

0.51min

1.7

SANYO : DIP22S

Continued on next page.

0.25

˚C
˚C

12501TN (KT)/N248YT, TS No.2843–1/4

LA7938

Continued from preceding page.

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* : The rating for the total current drawn from both the 5.0V and 5.75V supplies is 70mA.

Operating Conditions at Ta = 25˚C

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1

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1

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3

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4

xam 31V

31

xam *05– Am

21

xam *05– Am

9

V8xamVCCV31=231V

V01xamVCCV31=231V

xam 6V

11

xam 34V

41

po 5.21ot7.8V

CC

V21=26.4V

CC

(Band Switch Truth Table)

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L
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Z

Operating Characteristics at Ta = 25˚C, V

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CC
CC

F1).tas(IOAm04–= 7.0V
F2).tas(IOAm04–= 7.0V
F3).tas(IOAm04–= 7.0V
F4).tas(IOAm04–= 7.0V

V
V

V

OL5

V

OL6

LF

21

9

2F

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3F

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1, VCC2=12V

CC

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1 0.9Am
2 0.7Am

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IH6

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I

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IH3

OH3

I

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I

21

I

geR21

21

I

9

I9Am5= → Am0205001Vm

geR9

Am01=0.1V

KNIS

Am2=7.0V

KNIS

Am02–=53.557.551.6V

Am5= → Am0252– 52+Vm

Am02–=6.40.54.5V

.)pihcnoecnatsiserpu-llup(etats

FFOniebtsumretupmocorcimepytetagnepO

8.0V

8.0V

05– Aµ

4.027.05.1V

0.5V

0.3V

Continued on next page.

No.2843–2/4

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Continued from preceding page.

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Block Diagram

[For backup purposes]

LA7938

51

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71

V

V

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01ot8

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KNIS

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2.40.68.7Am

32.437.432.5V

0.9V

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7.0V

No.2843–3/4

LA7938

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 exported without obtaining the export 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 January, 2001. Specifications and information herein are subject
to change without notice.

PS No.2843–4/4