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National Semiconductor Introduces Low-Cost I2C Bus Driven Video Channel Chipsets For CRT Monitors

Dec 14, 2000

December 14, 2000 - National Semiconductor Corporation (NYSE:NSM), a leader in the development of integrated circuits for CRT monitor video channels, today announced two complete, low-cost video channel solutions for PC monitors, internet terminals, and CRTPADs. The three-piece chipsets consist of the latest generation of I2C compatible pre-amps, high-gain drivers, and a triple DC bias clamp that reduces component count from ten or more to one. While providing features that improve overall system performance, National's chipsets also offer low power consumption and low system cost to manufacturers of PC monitors.

"The CRT market is under tremendous price pressure," said Muthanna Salman, director of marketing for National's Data Conversion and Displays group. "As a result, manufacturers are leveraging existing investments to improve the cost competitiveness of new models. National is working with all of them, with dozens of design-ins in progress, and several already in production. They all agree that our low-cost chipsets are the key to minimal redesign effort, reduced component count, and lower overall system price. This complete solution provides the performance and price the end user is aiming for, and advances our leadership position in CRT drivers to the rest of the CRT neckboard."

LM1267/LM2467 and LM2480 Chipset
The LM1267/LM2467 and LM2480 chipset has the faster speed and higher bandwidth of National's two offerings. The LM1267, a 150MHz I2C CMOS preamp with full video signal parametric control, includes a programmable bandwidth feature for sharpness and EMI control. The LM1267 also has 4 DAC outputs for brightness and bias control. The part is a key link in the design of XGA (1024X 768) 85MHz or higher displays with OSD (On-Screen Displays).

The LM2467 high-gain driver with 7ns rise and fall time is matched to the LM1267 preamp and LM2480 bias clamp. It operates with 80V and 12V power supplies and has the same pinout as National's current 9 lead low power driver family (LM243X).

The LM2480 wide range integrated 80V triple bias circuit is matched to the LM1267 preamp for DC recovery of each of the AC coupled outputs. Black level clamping of the signal is carried out directly on the AC coupled input signal into the high impedance preamplifier input, thus eliminating the need for additional black level clamp capacitors.

LM1269/LM2469 and LM2480 Video Chipset
National's second new low-cost chipset includes the LM1269 CMOS preamp, the LM2469 high-gain driver and the LM2480 triple bias clamp. Like the LM1267, the LM1269 preamp is I2C compatible for convenient interfacing to the monitor's microcontroller. It operates at 110MHz. Bias and brightness can be controlled through the four DAC outputs at either G1 or the cathodes.

The LM2469 high-gain driver with 9ns rise and fall time is matched to the LM1269 and LM2480 bias clamp. It operates with 80V and 12V power supplies and also has National's standard 9 lead pinout.

The LM2480 wide range integrated 80V triple bias circuit is matched to the LM1269 preamp for DC recovery of each of the AC coupled outputs.  The chipset is targeted for XGA resolution (1024X768) or higher applications with OSD.

Pricing and Availability
Available now, the LM1269/LM2469/LM2480 chipset is priced at $3.00 in 1000-unit quantities. LM1267/LM2467/LM2480 chipset is priced at $3.50 in 1000 unit quantities.  The LM1269 and LM1267 are housed in a 24-pin plastic package (shrink DIP). The LM2469 and LM2467 are housed in a 9-pin TO-220 package. The LM2480 is offered in an 8-lead dual inline molded plastic package. For more information on the National's video chip sets, visit National's World Wide Web site at http://www.national.com/pf/LM/LM1269.html and http://www.national.com/pf/LM/LM2469.html 
http://www.national.com/pf/LM/LM2467.html or contact National's Design Support Group at 1-800-272-9959.

About National Semiconductor
National Semiconductor provides system-on-a-chip solutions for the information age. Combining real-world analog and state-of the-art digital technology, the company's chips lead many sectors of the personal computer, communications, and consumer markets. With headquarters in Santa Clara, California, National reported sales of $2.1 billion for its last fiscal year and has about 10,500 employees worldwide. Additional company and product information is available on the World Wide Web at www.national.com