Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: AD5398
Edited by the Electronicstalk Editorial
Team on 17 March 2005
Lens driver focuses on handset cameras
Analog Devices has extended its expertise in imaging and digital still camera signal processing to camera phones - the fastest-growing segment of the cellular phone market.
Analog Devices has extended its expertise in imaging and digital still camera signal processing to camera phones - the fastest-growing segment of the cellular phone market, with worldwide sales forecast to grow from 300 million to 640 million units by 2008 ADI's expertise in complex mixed-signal integration, its deep application-specific knowledge, and the company's experience with the world's top digital still camera and digital video camcorder manufacturers are the foundation for the development of its innovative new camera phone products
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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"ADI has pioneered the high-performance, image processing signal path in digital cameras over the past 10 years", said Mike Britchfield, Product Line Director for Precision Data Conversion, Analog Devices.
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"Building on this expertise in mixed-signal integration and analogue-front-end technologies, ADI is now applying its engineering know-how to other analogue functions within the camera, such as lens control".
Analog Devices' AD5398 lens driver represents a new category of analogue IC for the camera phone, which previously used multiple discrete chips to produce a low-quality auto-focus function.
Recognising that cellphone manufacturers need flexible camera solutions requiring minimum power, size and cost, ADI developed the category of "lens driver" IC based on in-depth understanding of system partitioning for optimum performance in digital imaging applications.
The AD5398 is the first device in a lens driver portfolio ADI will release this year.
Manufactured to achieve submicron analogue and digital geometries, the lens driver integrates data convertors, driver amplifiers, regulators and other key functions on a single chip to provide a complete solution requiring no external components.
In addition to a 10bit DAC (digital-to-analogue convertor), the chip also includes inductive protection diodes - components that typically consume large amounts of board space and reduce system reliability, but are advantageous for the protection they provide against voltage spikes.
A current sensing resistor and an internal reference are also integrated on-chip.
Because the AD5398 uses 80% less board space than discrete solutions, customers can achieve lower system costs and faster time to market.
In addition to its small size, the AD5398 lens driver has the performance levels to enable very fine focus, which improves image quality, particularly for nearby objects.
Only simple connections to the lens auto-focus motor, battery, and the processor/controller over an I2C interface are required.
The AD5398 features 120mA output current sink capability and 10bit resolution, exceeding typical performance requirements.
The AD5398 is available in a small 8-lead 3 x 3mm LFCSP (lead frame chip scale package) and is priced at less than $1.00 per unit in volume quantities.
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