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PDF LA7555 Data sheet ( Hoja de datos )
| Número de pieza | LA7555 | |
| Descripción | Monolithic Linear IC | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Ordering number:ENN2927
Monolithic Linear IC
LA7555
IF Signal Processing (VIF+SIF)
Circuit for TV / VCR Use
Overview
The LA7555 is a full sync detection method VIF + SIF
monolithic linear IC using a PLL. It has excellent 920kHz
beat and buzz beat characteristics, making it ideal for use
in audio multiplexing and high-quality AV equipment.
Functions
• VIF section
· VIF amplifier · Video sync detecton · IF AGC
· B/W NC
· RG AGC
· AFT
· VCO
· APC DET
· Lock DET
• SIF section
· SIF limiter amplifer · FM quadrature detection
• Audio section
· DC attenuator
· AF driver
• Muting
· Audio muting (pin 2)
· AFT defeat (pin 14)
· Audio-Video simultaneous muting (pin 10, 13)
Package Dimensions
unit:mm
3067A-DIP24S
[LA7555]
21.0
24 13
1
0.9
12
(0.71) 1.78 0.48
0.95
Features
• 24-pin DIP shrink package being the smallest one used
for PLL ICs.
• Excellent 920kHz beat characteristics.
• Excellent buzz beat characteristics.
• High-gain VIF amplifier.
• High-speed AGC possible.
• Excellent power supply ripple characteristics.
SANYO : DIP24S
Specifications
Maximum Ratings at Ta = 25˚C
Parameter
Maximum supply voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
Pd max
Topr
Tstg
Ta≤50˚C
Conditions
Ratings
Unit
13.8 V
1200 mW
–20 to +70 ˚C
–55 to +150 ˚C
Continued on next page.
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)/N078YT, TS No.2927–1/11
1 page  
LA7555
2. Video detector
As shown in Fig.2-1, the video detector is a PLL-type. AM detection (video detection) is by phase shifting the IF
signal and VCO output signal 180° and multiplying the input signal. It offers excellent buzz and beat characteris-
tics as detection is by multiplication by a clean signal. Also, excellent detection characteristics are obtained in the
same manner for the overmodulation signal.
Fig.2-1
3. Video amplifier B/W noise canceller
As shown in Fig.3-1, the video amplifier amplifies the detection output voltage over a wide band to the desired
voltage (=2.2Vp-p). The amplified video signal passes through the B/W noise canceller and is output to pin 21.
White : The noise canceller operates as shown in Fig.3-3 as the input of noise exceeding the white level of the
video signal as shown in Fig.3-2 will cause noticeable noise on the screen.
Black : The noise canceller operates as shown in Fig.3-3 as the input of noise exceeding the sync signal tip as
shown in Fig.3-2 will prevent proper operation of the next-stage sync separation circuit.
Fig.3-1
Fig.3-2
Fig.3-3
No.2927–5/11
5 Page 
LA7555
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.2927–11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LA7555.PDF ] | |
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