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PRODUCT INFORMATION
Vol.87
AV CouplerTM Receiver IC Developed Easy implementation of cordless infrared optical communication systems
LA9520V
Overview
Optical data transmission systems that transmit signals across distances using infrared light have been used in remote controls and cordless headphones as an easy means to implement cordless communication. Now, optical transmission of both audio and video signals has been achieved as well. This technology is seen as a mean for avoiding the difficulties of connecting AV equipment with cables, and many applications have been developed. Products that include this functionality, in particular, video cameras, have been well received not only in the Japanese market, but in the US and European markets as well. Other applications include games, portable DVD players, and digital cameras, and, for example, it is now possible to connect the output of these devices to wall-mounted TV screens. Thus IR communication systems can be incorporated in equipment that outputs composite video and stereo audio signals. AV product manufacturers are now aggressively developing new products that incorporate this function, and the market is expected to grow rapidly. Sanyo has now developed the LA9520V AV CouplerTM receiver IC that receives optically transmitted infrared signals. This chip, in combination with the LA9511W optical transmission IC which is already available in production quantities, forms a complete system in which both optical transmission and reception have been implemented in single chips. Previously, AV couplerTM receivers were implemented with discrete devices and required a printed circuit board area of about 10 cm2. Therefore, it was not possible to use AV couplerTM receivers in portable equipment. Also, the cost increased since a number of components were required for the recevier circuit. The LA9520V receives wireless transmissions using 850 nm infrared light for signals that conform to the frequency allocations in the applicable EIAJ standards. In particular it uses 4.3 and 4.8 MHz for the left and right channel audio carrier frequencies, and 11.8 MHz (sync tip) to 13.5 MHz (white peak) for the video frequencies, and can receive video in either the NTSC or PAL format. Except for the output level and muting level adjustments, the LA9520V is completely adjustment free. The LA9520V provides an output level adjustment function that allows the left and right output levels to be adjusted using an electronic level control by applying voltages to input pins. It also allows the
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
output stage no input/weak input muting function operating point to be set with an electronic level control. The development of this single-chip receiver makes it far easier to implement AV couplerTM systems. It also allows these systems to be miniaturized enough to be practical in portable equipment and contributes significantly to reducing total system costs by reducing the number of components required.
Features
* Input Block -- Excellent current-voltage conversion bandwidth characteristics -- Wide ALC operating range achieved by including an ALC function in the preamplifier. * Audio Block -- Built-in 4.3 and 4.8 MHz audio demodulation circuits. -- Adjustable operating level muting function that mutes the output stage when there is no input signal. -- The output amplifier output left and right channel levels can be adjusted by voltages applied to input pins. This supports the use of an electronic level control function. * Video Block -- Video demodulator -- Video amplifier supports 75 drive and supports output level adjustment with an electronic volume control. -- Muting function that mutes the output stage when no input signal is present. The muting operating level can be adjusted from an input pin. -- Built-in filters for suppression of spurious high-frequency components
Specifications
* Operating supply voltage range: 4.5 to 5.5 V * Electrical characteristics (provisional) Supply voltage: Vcc = 5 V (Ta = 25C) Typical operating conditions -- Audio carrier frequencies: Left channel: 4.3 MHz, Right channel: 4.8 MHz -- Video carrier frequencies: 11.8 to 13.5 MHz -- Audio demodulated output level: 260 mV rms (1 kHz, degree of modulation: 22.5 kHz) -- Video demodulated output level: 1 Vpp (for an NTSC composite video signal with a 2 MHz modulation) * Package: SSOP-36
SANYO Electric Co., Ltd. Semiconductor Company Overseas Marketing Division
2
PRODUCT INFORMATION
Sample Availability
The LA9520V will be available in sample quantities by mid September 1999, and in production quantities (100,000 units per month) by April 2000.
SEPTEMBER 8, 1999
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.90899/87
3

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