LM1238110 MHz I2C Compatible RGB Preamplifier with InternalSimple OSD Generator and 4 DACsGeneral Des criptionThe LM1238 pre-amp is an integrated, three channel videopre-amp. It has an I2C compatible interface which allowscontrol of all the parameters necessary to directly setup andadjust the gain and contrast in the CRT display. Four I2Ccompatible DACs are available to control monitor bias andbrightness circuits. The LM1238 preamp is designed to be100% compatible with the LM246x high gain driver familyand the LM2479/80 Clamp ICs.Black level clamping of the video signal is carried out directlyon the AC coupled input signal into the high impedancepre-amplifier inputs, eliminating the need for additionalclamp capacitors. Horizontal and vertical blanking of theoutputs is provided. Vertical blanking is optional and itsduration is register programmable.