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Part: LC7456A
Category:
Description:
Company: Sanyo Semiconductor Corporation
Datasheet: Download LC7456A datasheet File size : 107 kB
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Datasheet text preview:
Ordering number : ENN*6733
LC7456A
CMOS IC
LC7456A
U.S. Closed Caption Signal Extraction IC
Preliminary Overview
The LC7456A receives the composite video signal from the V / C (Video Chroma) signal processor and extracts the closed caption data. This data and a clock signal, generated by an on-chip PLL, are then sent to the decoder IC. The LC7456A is a CMOS version of the LA7945 IC also currently in production. The differences between the LA7945 and the LC7456A are a change from Bipolar to CMOS technology, a smaller package size (22 pins to 16 pins), and a reduction in the external circuitry requierd. An LC8640XX series microcontroller is needed to perform the decoding after the LC7456A has extracted the caption data from the composite video signal.
Features
· · · · Low power consumption due to CMOS process Accurate caption signal extraction using a built-in pead hold circuit and digital technology. Power Requirement : 5V ± 10 % Package : DIP16
Any and all SANYO products described or contained herein do not have specifications that can handle a p p l i c a t i o n s that require extremely high levels of reliability, such as life-support systems, aircraft's c o n t r o l systems, or other applications whose failure can be reasonably expected to result in serious p h y s i c a l and/or material damage. Consult with your SANYO representative nearest you before using a n y 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 p a r a m e t e r s ) 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
Ver. 1.02B 21594 D2000 RM (IM) O No.6733-1/6
LC7456A Pin Arrangement Diagram (DIP16) Package Dimensions
unit : mm 3006B
1 2 3 4 5 6 7 8 VSS1 TEST1 LN21 CPDT CPCK O/E HSYNC VDD1 CP 16 VSS2 15 VDD2 14 TEST2 13 VCOR 12 CVIN 11 PEAK 10 SLICE 9
3 .0 3 .4 3 .6 5 ma x
16
9
7 .6 2 6 .4
1
19.2
8
ILC00006
0.71
2.54
0.48
1.2
SANYO : DIP16(300mil)
Pin Function
No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Name VSS1 TEST1 LN21 CPDT CPCK O/E HSYNC VDD1 SILCE PEAK CVIN VCOR TEST2 VDD2 VSS2 CP Function GND Test pin, usually open Line 21H pulse output Caption data output Caption data latch clock output Field determination output HSYNC input Power supply Caption data slice level output Caption data peak hold level output Composite video input Built-in VCO frequency control pin Test pin, usually open Power supply GND Built-in PLL filter pin
No.6733-2/6
0 .2 5
LC7456A System Block Diagram and Application
C-Video
1M
3.3K
+ --
10K
1µF
1000pF
2.2µF
16
15
14
13
12
11
10
9
PLL (VCO)
CLAMP
DATA PEAK HOLD (Data Slice)
HSYNC PEAK HOLD (Hsync Slice)
DATA SLICER
1
2
3
4
5
6
7
8
From Fly Back LC8640XX
ILC00081
No.6733-3/6
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