LM1283

LM1283 140 MHz RGB Video Amplifier System with On Screen Display (OSD) April 1999 LM1283 140 MHz RGB Video Amplifier System with On Screen Display (OSD) General Description The LM1283 is a full feature video amplifier with OSD inputs, all within a 28-pin package. This part is intended for use in monitors with resolutions up to 1280 x 1024. The video section of the LM1283 features three matched video amplifiers with blanking. All of the video amplifier adjustments feature high input impedance 0V to 4V DC controls, providing easy interfacing to bus controlled alignment systems. The OSD section features three TTL inputs and a DC contrast control. The switching between the OSD and video section is controlled by a single TTL input. Although the OSD signals are TTL inputs, these signals are internally processed to match the OSD logic low level to the video black level. When adjusting the drive controls for color balance of the video signal, the color balance of the OSD display will track these color adjustments. The LM1283 also features an internal spot killer circuit to protect the CRT when the monitor is turned off. For applications without OSD insertion please refer to the LM1205 or LM1208 data sheets. n n n n n n n n n TTL OSD inputs, 50 MHz bandwidth On chip blanking, outputs under 0.1 V when blanked Video/OSD switch speed of 7 ns Independent drive control for each channel for color balance 0V to 4V, high impedance DC contrast control with over 40 dB range 0V to 4V, high imp...