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ADI electronics ICs target higher resolution digital displays

Posted: 29 Jun 2005 ?? ?Print Version ?Bookmark and Share

Keywords:analog devices? adi? display? decdriver? lcd microdisplay driver?

Analog Devices Inc. (ADI) introduced new display electronics ICs for improving image quality and enabling higher resolution digital displays, such as those used for digital cinema and advanced television applications.

Extending ADI's DecDriver family of LCD microdisplay drivers that provide 12-bit resolution, the two new ICs can improve brightness uniformity and contrast. The company also introduced what it claims as the industry's highest performing single-chip LCD power module, which integrates a patent-pending VCOM amplifier to drive the common plane shared by all pixels on an LCD panel. According to the company, this reduces cost and improves image quality in TFT-LCD displays, such as those used in today's advanced LCD-TV systems.

"Consumer demand is rising for digital displays that accept digital and high-definition broadcast formats," said Bob Esdale, product line director for ADI's linear products. "Display designers are faced with the challenge of delivering flawless image quality across a wider viewing area while reducing cost. Today's higher resolution displays must deliver ever-increasing image quality to enhance the viewing experience of the consumer."

The AD8387 and AD8388 DecDriver ICs are complete, feature-rich solutions for projection system designs. The DecDriver architecture enables a modular design approach for projection systems targeting high resolutions, such as SXGA, WXGA (720p), HD (1080p) as well as 2K and 4K digital cinema standards. Both chips deliver better output accuracy than previous generations with improved laser-trimmed resistor matching. The 12-bit input data resolution of both devices improves display uniformity, and better black-level gamma correction takes full advantage of a system design that processes 10-bit imaging data. Driver resolution of 12-bits helps to minimize artifacts, which are most noticeable in bright displays.

The 12-bit input latches of the AD8387 and AD8388 decimate digital input data at 100MHz and 120MHz clock rates, respectively. The 12-bit input is sequentially multiplexed into either 12 or 6 separate high speed DACs. These in turn drive 12 or 6 channels of high voltage output amplifiers. The voltage outputs are laser trimmed for high absolute accuracy over a full 9V to 18V dynamic range. These devices typically settle into a 200pF load to 0.25 percent within 33ns. The output signal can be adjusted for dc signal reference, signal inversion and full scale for optimum fit to the microdisplay bias levels. A flexible digital input interface allows several of these drivers to be used in parallel for higher resolution displays. R/L (right/left) control sets the input data loading for ease of both front and rear-projection system design.

The 12-channel AD8387 and 6-channel AD8388 DecDriver ICs are sampling in 80-lead 12-by-12mm TQFP and 48-lead 7-by- 7mm LFCSP packages. Both devices are priced at $8.45 and $5.10 per unit, respectively, in 1,000-quantity pieces. Full production will begin in August 2005.

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