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'Smallest' lens driver rolls for autofocus cameras

Posted: 08 Dec 2008 ?? ?Print Version ?Bookmark and Share

Keywords:lens driver? autofocus camera? cellphone?


Maxim Integrated Products has released the MAX14515, a DC/AC liquid lens driver for autofocus camera modules.

Touted to be the smallest liquid lens driver, the MAX14515 packs I?C interface and the charge-pump topology in a tiny 2mm x 1mm WLP. The device features a high-voltage differential output controlled through an I?C interface and employs a charge-pump topology to reduce the number of external components typically used for autofocus drivers in camera modules. The device is suitable for tiny cellphone camera modules that use the newest autofocus technologies.

The traditional liquid lens drivers available on the market require components typically found in boost topologies, which minimally include a large inductor, diode and high-voltage capacitor. Meanwhile, other charge-pump-based drivers are large and require many capacitors. When the numerous other supporting discrete components are added to the design, the size of these discrete solutions requires a large footprint, one that can no longer be accommodated inside the shrinking autofocus camera modules.

The MAX14515 needs at most two small external capacitors: one low-voltage capacitor and a tiny bypass capacitor. The device integrates an 8bit monotonic DAC with a single-differential high-voltage output controlled by a 2-wire I?C interface to set the amplitude. The high-voltage output delivers up to 42Vrms into a 200pF liquid lens load at 1.1kHz.With its small footprint, which is at least 60 percent smaller than the market's available drivers, the MAX14515 liquid lens driver easily fits inside the camera module. The unique combination of smallest footprint, I?C interface, and low shutdown current make the MAX14515 ideal for enabling today's newest high-performance, autofocus camera modules.

The MAX14515 is fully specified over the -40C to +85C extended temperature range. The device is priced at $1.50 (1,000-up, FOB USA).

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