LM1246 - National Semiconductor

LM1246 RGB Preamplifier

The LM1246 pre-amp is an integrated CMOS CRT preamp. It has an I2C compatible interface which allows control of all the parameters necessary to directly setup and adjust the gain and contrast in the CRT display. Brightness and bias can be controlled through the DAC outputs, which are well matched to the LM2479 and LM2480 integrated bias clamp ICs. The LM1246.

Features

n Fully addressable 512 Character OSD, simiilar in features to the LM1237/LM1247, with selectable 2 byte character addressing or LM1247 bank select modes n Internal 512 character OSD ROM usable as either (a) 384 2-color plus 128 4-color characters, (b) 640 2-color characters, or (c) some combination in between n Internal 512 character RAM, which can be displayed as one single or two independent windows n Enhanced I2C compatible microcontroller interface to allow versatile Page RAM access n n Applications n Low end 15" and 17" bus controlled monitors with OSD n 1024x768 displays up to 85 Hz re.