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Out in Front |
The
ubiquitous CRT display has one difficult requirement: You have to drive its
control grids with signals having amplitudes of 50 to 100V while maintaining
signal fidelity. For high-resolution CRT displays, the National Semiconductor
LM2405 CRT-driver IC incorporates three identical channels, featuring typical
7-nsec rise time and 5.5-nsec fall time with 8-pF load and output- voltage
swing as high as 50V p-p (for VCC at 80V). It's suitable for 128031024-pixel,
noninterlaced monitors with a 60-Hz refresh rate, which CAD systems typically
use, as well as SVGA (8003600-pixel) and XGA (10243768-pixel) monitors at 75-Hz
refresh.
The device comes in a standard 11-pin, TO-220 staggered-lead
package with a built-in heat-sink mounting tab. Input range is 0 to 6V, and
each channel has gain internally set to –14. The device works with clock
frequencies as high as 130 MHz and is stable driving loads as high as 20 pF.
The LM2405 operates from an 80 and 12V supply and costs $3.50 (1000).
—by
Bill Schweber
National Semiconductor Corp, Santa Clara, CA. (800) 272-9959, http://www.national.com.
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