Page 1
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
Video Switch for TV/VCR Use
Ordering number:ENN4039
LA7957
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Overview
The LA7957 is an audio video switch for televisions, VCRs
and other video equipment, and for audio and video amplifiers in multimedia equipment.
The LA7957 is ideal for audio and video switching in dualtuner, BS and PIP applications.
The LA7957 operates from a 12V supply and is available
in 20-pin SDIPs.
Features
• Suitable for dual tuner, BS and PIP applications.
• Three video inputs.
• Two video outputs.
• Two stereo audio channels.
• Muting of one audio channel.
• 8.0 to 13.2V supply voltage.
• 20-pin SDIPs.
Specifications
Maximum Ratings at Ta = 25˚C
retemaraPlobmySsnoitidnoCsgnitaRtinU
egatlovylppuSV
egatlovNIETUMdna2TNOC,1TNOCV
noitapissidrewopelbawollAxamdP 007Wm
erutarepmetgnitarepOrpoT 07+ot02–
erutarepmetegarotSgtsT 521+ot55–
CC
I
Package Dimensions
unit:mm
3021C-DIP20
[LA7957]
24.0
20
1
1.0
(0.57)
2.54
0.5
1.2
11
7.62
10
(3.25)
0.51min
SANYO : DIP20
6.4
0.25
3.9max
3.3
4.41V
4.41V
˚C
˚C
Recommended Operating Conditions at Ta = 25˚C
retemaraPlobmySsnoitidnoCsgnitaRtinU
egatlovylppuSV
egnaregatlovylppuSV
CC
CC
O2500TN (KT)/5052TS No.4039–1/4
21V
2.31ot0.8V
Page 2
Operating Characteristics at Ta = 25˚C, VCC=12V
retemaraPlobmySsnoitidnoC
niardtnerruCI
V
Vot1
NI
V
V
V
V
NI
Vdna1
TUO
NI
NI
NI
nloitcejer
egatlov
TUO
Vot1
NI
Vot1
NI
Vot1
Vro3
NI
NI
egatlovsaibtupni3V
egatlovsaibtuputo2V
ecnadepmitupni3Z
niagegatlovlennahc-oediVA
htdiwdnablennahc-oediVWB
egatlovesionlennahc-oediVV
noitcejerklatssorc2TC
Vot2
NI
noitcejermuhlennahc-oediVRH
niagegatlovlennahc-oiduAA
htdiwdnablennahc-oiduAWB
egatlovesionlennahc-oiduAV
egatlovesiontuptuoetuMV
noitcejermuhlennahc-oiduARH
tnerrucegakael1TNOCI
tnerrucegakael2TNOCI
tnerrucegakaelNIETUMI
klatssorc3
saibtupniR2NIAdnaL2NIA,R1NIA,L1NIA
egatlovsaibtuptuo2TUOAdna1TUOAV
ecnadepmitupniR1NIAdnaL1NIAZ
ecnadepmitupniR2NIAdnaL2NIAZ
noitrotsidcinomrahlatotlennahc-oiduADHTV
noitcejerklatssorc2NIAot1NIATC
noitcejerklatssorclennahc-thgirot-tfeLTC
egatlovtupnilevel-HGIH2TNOCdna1TNOCV
egatlovtupnilevel-HGIHNIETUMV
CC
BVI
VO
VI
V
V
VN
1V
TC
2V
V
V
BAI
AO
1AI
2AI
A
A
AN
1A
SA
MAO
A
1HI
1L
2L
2HI
3L
LA7957
sgnitaR
nimpytxam
533475Am
4.47.40.5V
2.88.64.7V
zHk1=f511272kΩ
V,zHk1=f
V
V
V
V
V
V
V
NI
I
I
tniop
57=gR Ω htdiwdnabzHM01,3.00.1smrVm
57=gR Ω zHM85.3=f,5405Bd
57=gR Ω zHM85.3=f,5405Bd
57=gR,zH05=f Ω 8132Bd
zHk1=f748688kΩ
zHk1=f154759kΩ
V,zHk1=f
I
I
I
006=gR Ω zHk02otzH02=f,0105smVµ
k7.4=gR Ω f, ≤ zHk15709Bd
k7.4=gR Ω f, ≤ zHk12728Bd
I
k7.4=gR Ω 0464Bd
V0=3–Aµ
1TNOC
V0=3–Aµ
2TNOC
V0=3–Aµ
NIETUM
Votdetcennoc3
25.01kΩ
NI
zHM1.0=f,evawenisp-pV1=6.51.66.6Bd
Bd3–ehtotzHM1.0,evawenisp-pV7.0=
smrVm005=5.0–20.0–5.0+Bd
tniopBd1–ehtotzHk1,smrVm005=001zHk
zHk1-f,smrVm005=30.02.0%
zHk1=f,smrVm005=20.01.0smrVm
NOetumronepotupnI8293Bd
01zHM
5.41.57.5V
2.38.34.4V
1.14.17.1V
1.14.17.1V
tinU
Pin Assignment
Top view
No.4039–2/4
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Block Diagram
LA7957
Pin Functions
rebmuNemaNnoitpircseD
1VNI11lennahctupnioediV
2DNGdnuorG
3VNI22lennahctupnioediV
41TNOCtupnitcelesecruos1lennahcoiduadnaoediV
51TUOV1lennahctuptuooediV
6V
7VNI33lennahctupnioediV
82TNOCtupnitcelesecruos2lennahcoiduadnaoediV
92TUOV2lennahctuptuooediV
01NIETUMtupnilortnocetuM
11R1TUOAtuptuolennahc-thgir1lennahcoiduA
21R1NIAtupnilennahc-thgir1lennahcoiduA
31CNnoitcennocoN
41R2NIAtupnilennahc-thgir2lennahcoiduA
51R2TUOAtuptuolennahc-thgir2lennahcoiduA
61L2TUOAtuptuolennahc-tfel2lennahcoiduA
71L2NIAtupnilennahc-tfel2lennahcoiduA
81CNnoitcennocoN
91L1NIAtupnilennahc-tfel1lennahcoiduA
02L1TUOAtuptuolennahc-tfel1lennahcoiduA
CC
egatlovylppuS
No.4039–3/4
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LA7957
Output Selection
1TNOC2TNOCNIETUM1TUOV2TUOVR/L1TUOAR/L2TUOA
WOLWOLWOLV
WOLHGIHWOLV
HGIHWOLWOLV
HGIHHGIHWOLV
WOLWOLHGIHV
WOLHGIHHGIHV
HGIHWOLHGIHV
HGIHHGIHHGIHV
Note
When using the two-input, two-output configuration, VIN2 and VIN3 should be connected externally.
1V
NI
1V
NI
2V
NI
2V
NI
1V
NI
1V
NI
2V
NI
2V
NI
1R/L1NIAR/L1NIA
NI
3R/L1NIAR/L2NIA
NI
1R/L2NIAR/L1NIA
NI
3R/L2NIAR/L2NIA
NI
1R/L1NIA–
NI
3R/L1NIA–
NI
1R/L2NIA–
NI
3R/L2NIA–
NI
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 October, 2000. Specifications and information herein are subject
to change without notice.
PS No.4039–4/4
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