LM1229

www.DataSheet4U.com LM1229 I2C Compatible CMOS TV RGB and Deflection Processor June 2005 LM1229 I2C Compatible CMOS TV RGB and Deflection Processor General Description The LM1229 pre-amp is an integrated CMOS CRT RGB preamp plus horizontal and vertical deflection processing with an I2C compatible interface for controlling all the parameters necessary to directly adjust the gain, contrast and brightness and geometry of the CRT display. In the RGB section, the CRT bias is controlled by the three DAC outputs which are matched to the LM248x integrated bias clamp ICs. The brightness control operates on the video channels rather than the bias channels and is designed to maintain the CRT color temperature through the full range of adjustment. The On Screen Display inputs accept either digital or analog input levels. Black level clamping of the video signal is carried out directly on the AC coupled input signal into the high impedance preamplifier input, thus eliminating the need for additional clamp capacitors. Blanking inputs are provided which can accept both horizontal and vertical flyback inputs for composite blanking of the video. A vertical blanking output pulse is provided which can drive a G1 blanking amplifier such as the one in National’s LM2485 clamp IC. The LM1229 RGB outputs are compatible with National’s high gain drivers (http://www.national.com). The Deflection section uses a 12.0 MHz resonator and with it the horizontal processor is capable of locking to seven di...