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| 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 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 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 3.65max 16 9 7.62 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 0.25 LC7456A System Block Diagram and Application C-Video 1M 3.3K + -- 10K 1F 1000pF 2.2F 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 LC7456A 1. Absolute Maximum Ratings at VSS=0V and Ta=25C Parameter Supply voltage Input voltage Output voltage Maximum power dissipation Operating temperature range Storage temperature range Symbol Pins Conditions VDD1=VDD2 VDDMAX VDD1, VDD2 VI HSYNC, CVIN VO LN21, CPDT CPCK, O / E Pdmax DIP16 min. -- 0.3 -- 0.3 -- 0.3 Ratings typ. max. +7.0 VDD+0.3 VDD+0.3 300 unit V mW Topr -- 30 +70 C Tstg -- 55 +150 * VSS1 and VSS2 are same level. VDD1 and VDD2 are also same level. 2. Recommended Operating Range at VSS=0V and Ta= -- 30C to +70C Parameter Operating supply voltage Input high voltage Input low voltage CVIN analog input range HSYNC input frequency range Symbol VDD VIH VIL CVSYNC fH Pins VDD1,VDD2 HSYNC HSYNC CVIN HSYNC Conditions VDD1=VDD2 VDD[V] min. 4.5 Ratings typ. max. 5.5 VDD 0.25VDD 1Vp-p 1Vp-p+3dB 15.73 15.90 KHz unit V 4.5 to 5.5 0.85VDD 4.5 to 5.5 VSS SYNC-WHITE=1.0V 4.5 to 5.5 1Vp-p-3dB 4.5 to 5.5 15.60 3. Electrical Characteristics at VSS=0V and Ta= -- 30C to +70C Parameter Input high current Input low current Output high voltage Output low voltage Input clamp voltage Symbol IIH IIL VOH VOL VCLMP Pins HSYNC HSYNC LN21, CPDT CPCK, O / E LN21, CPDT CPCK, O / E CVIN Conditions VIN=VDD VIN=VSS IOH= -- 4mA IOL=10mA VDD[V] 4.5 to 5.5 4.5 to 5.5 min. Ratings typ. max. 1 -- 1 V 1 2.3 2.5 2.7 unit A 4.5 to 5.5 VDD-1.2 4.5 to 5.5 5.0 No.6733-4/6 LC7456A Ratings typ. 10 -- 70 6 Parameter Clamp input current Clamp output current Current dissipation Symbol CII COI IDD CVIN CVIN Pins Conditions CVIN=3V CVIN=2V VDD[V] 5.0 5.0 4.5 to 5.5 min. 5 -- 120 max. 18 -- 30 15.0 unit A VDD1,VDD2 mA * VDD1 and VSS1 are the power pins for the digital circuits of the LC7456A, and VDD2 and VSS2 for the analog circuits. Connect like the following figure to reduce into the both circuits. LC7456A Power Supply VDD1 VSS1 VDD2 VSS2 ILC00022 No.6733-5/6 LC7456A 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 December, 2000. Specifications and information herein are subject to change without notice. PS No.6733-6/6 |
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