Sanyo LA7555 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
IF Signal Processing (VIF+SIF)
Circuit for TV / VCR Use
Ordering number:ENN2927
LA7555
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, T aito-ku, TOKYO, 110-8534 JAPAN
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
(0.71)
24
1
0.9
1.78
0.48
0.95
13
7.62
12
(3.25)
0.51min
SANYO : DIP24S
6.4
0.25
3.9max
3.3
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.
Specifications
Maximum Ratings at Ta = 25˚C
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O2500TN (KT)/N078YT, TS No.2927–1/11
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Continued on next page.
LA7555
Continued from preceding page.
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Operating Conditions at Ta = 25˚C
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No.2927–2/11
LA7555
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Equivalent Circuit Block Diagram
No.2927–3/11
Precautions when using the LA7555
LA7555
Description of Operation
1. IF amplifier
As shown in Fig.1-1, the IF amplifier consists of three amplifiers directly connected with balanced input.
Amplifiers 1, 2 and 3, and the gain are controlled by the AGC.
Fig.1-1
No.2927–4/11
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