Product category:
Analogue and Mixed Signal ICs
News Release from: National Semiconductor | Subject: LM1237, LM1238 and LM1247
Edited by the Electronicstalk Editorial
Team on 30 May 2002
Video preamps take on-screen displays
onboard
National Semiconductor has three new CMOS video preamplifiers with internal on screen display (OSD) for CRT monitors.
National Semiconductor has three new CMOS video preamplifiers with internal on screen display (OSD) for CRT monitors The I2C compatible preamplifiers join National's highly integrated, low cost family offering CRT manufacturers a complete portfolio of neckboard solutions for any size and resolution monitor, from 14 to 21in, with a choice of OSD support
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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The single chip LM1237, LM1238 and LM1247 each provides high integration, low cost and best-in-class display performance.
The preamplifiers, all pin-to-pin compatible and well matched to National's integrated bias clamp ICs and CRT drivers, feature either icon-based or character-based OSD generators.
The preamplifiers reduce the cost and effort required to implement an OSD, while surpassing the quality, flexibility and ease-of-use of any OSD available today.
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"Our customers, facing tremendous price pressure, limited development resources and a maturing market, are demanding increasing levels of integration and system support from their suppliers", said Muthanna Salman, director of marketing for CRT displays at National Semiconductor.
"With the only integrated CMOS preamplifier and OSD on the market, National now offers a complete solution for the entire CRT monitor neckboard, providing the best performance, highest level of integration and lowest cost for any application".
"National's continued product innovation for CRT monitors has produced a series of preamplifiers that deliver superior value through a high level of integration, low cost and enhanced OSD features", said Morris Wang, executive vice president of Proview Technology.
"Particularly important is the pin-to-pin compatibility of the LM1238 and LM1237, which enables us to leverage a single design to meet the requirements of any monitor model".
National's LM1237 is a 150MHz, I2C compatible CMOS RGB video preamplifier with internal 254-character OSD.
It contains 192 two-colour and 64 four-colour characters with an option to program up to 318 two-colour characters.
The mask programmable characters are defined in a 12 x 18 matrix and displayed in a 512-character page RAM.
The LM1237 controls all the parameters necessary to directly set up and adjust the gain and contrast of a CRT display.
Brightness and bias can be controlled through the DAC outputs, which are well matched to National's LM2480 and LM2479 integrated bias clamp ICs.
National's LM1247 provides the same features and bandwidth of the LM1237, but instead offers a 512-character OSD with 128 four-colour characters that can be used to extend the OSD capacity to as many as 640 two-colour characters.
National's LM1238 is a 110MHz, I2C compatible CMOS RGB video preamplifier that introduces a new concept in OSD.
Pin-to-pin compatible with the LM1237 and LM1247, the LM1238 contains an entirely language-independent icon-based OSD.
This graphical OSD eliminates the majority of the development time and firmware needed to design and program OSD pages.
A standard set of icons is programmed into the LM1238 ROM and the manufacturer simply addresses the relevant adjustment icon to display an OSD page.
The entire sequence can be completed with just two bytes of information.
National's LM1237 and LM1238 preamplifiers, both in 24-pin DIP, are available now.
In 1000-unit quantities, the LM1237 costs $3.50 and the LM1238 costs $1.75.
The LM1247, also in a 24-pin DIP, is sampling now and will be released to production in August.
The LM1247 will cost $4.00 in 1000-unit quantities.
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