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PRODUCT INFORMATION
Vol. 81
Time Code Reception IC Developed IC optimal for radio controlled clocks that automatically correct their time setting according to time standard broadcasts
LA1650/C
Overview
Clocks are indispensable in our daily lives, and due to the widespread use of microcontrollers in home appliances, built-in clock functions are now taken for granted. Most contemporary clocks are quartz clock driven by a crystal oscillator and provide high-precision timekeeping. However, there is a tendency for large time discrepancies to appear in clocks used in severe environments, such as clocks in cars. Thus we find it necessary to reset clocks frequently. Furthermore, since quartz clocks require a power supply these clocks must be reset occasionally, for example when changing the battery in a battery powered clock, when a home appliance is unplugged, or after a power outage. Setting the time requires determining the time from a TV, radio, or telephone company's time service and directly entering the time by hand. This is an annoying operation. There is now a product, called the radio controlled clock, that automatically sets its own time. These clocks receive standard radio time codes broadcast from the town of Sanwamachi in Ibaraki Prefecture, and use built-in functions to automatically set themselves to the exactly correct time. However, this radio broadcast is an experimental system and can only be received in a limited area. There are also radio controlled clocks that use the GPS (global positioning system) used in car navigation systems and other products, but GPS reception requires complex circuits that make these clocks expensive. Recently, a long-wave standard radio facility was completed in Fukushima Prefecture, and began real standard radio broadcasting on June 10 (Time Day) 1999. Since this signal is broadcast with a significantly increased output power, the reception area has increased to now cover essentially all of Japan except Okinawa. The full-scale operation of this standard broadcast means that it is now extremely likely that demand for radio controller clocks that include a function for automatically setting their own time will grow rapidly. Sanyo has now developed the LA1650/C time code reception IC that receives this standard radio broadcast and includes a function for automatically correcting the time kept by a quartz clock mechanism. This IC, when combined with an existing quartz clock mechanism and an antenna, can
SANYO Electric Co., Ltd. Semiconductor Company Overseas Marketing Division
TOKYO OFFICE: Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 1
PRODUCT INFORMATION
easily implement a radio controlled clock that does not require that the time be reset when replacing batteries or on power outages. The LA1650/C takes full advantage of Sanyo's semiconductor technology that has a proven track record in home and car tuner ICs. Despite its low-power operation, the LA1650/C can implement a highly sensitive receiver. It supports a wide supply voltage range, from 1.2 to 6.5 V, and can be used in products from household clocks that operate on a single dry cell, to telephones, cameras, and car clocks. Furthermore, it can convert any quartz clock product into a radio controlled clock and free users from the bother of resetting these clocks. The LA1650/C also supports daylight saving time, whose introduction is under consideration in Japan. The LA1650/C will first be provided in a DIP-18 package, but will also support supply as a bare chip product to respond to a wide range of equipment design needs from equipment manufacturers.
Features
* Low-voltage drive (Vcc 1.2 V) * Low current drain (500 A for @ 10 dB V input) * Standby function (Standby current: 1 A) * High sensitivity reception (Reception sensitivity: Vin = 10 dB V
Functions and Specifications
* RF amplifier, rectifier circuit, detector circuit, time code output * Supply voltage range: 1.2 to 6.5 V (single-voltage power supply) * Operating temperature: -25 to +75C * Package: DIP-18 (LA1650), chip (LA1650C)
Sample Availability
Sample of the LA1650/C will be available in June 1999; production quantities will be anticipated in September 1999.
JUNE 23, 1999
SANYO Electric Co., Ltd. Semiconductor Company Overseas Marketing Division
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PRODUCT INFORMATION
s 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. s 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. s 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. s 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. s 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. s 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. s 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. s 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.
SANYO Electric Co., Ltd. Semiconductor Company Overseas Marketing Division
PS 62399/81
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