Part # LM1237 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM1237 150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs


Part Details:

LM1237 January 2004 150 LM1237150 MHz I2C Compatible RGB Preamplifier with Internal MHz 254 Character OSD and 4 DACs I General Description 2 n Internal 254 character OSD usable as either (a) 190 C 2-color plus 64 4-color characters, (b) 318 2-color The LM1237 pre-amp is an integrated CMOS CRT preamp. characters, or (c) some combination in between. Compatible It has an I2C compatible interface which allows control of all n OSD override allows OSD messages to override video the parameters necessary to directly setup and adjust the and the use of burn-in screens with no video input gain and contrast in the CRT display. Brightness and bias n 4 DAC outputs (8-bit resolution) for bus controlled CRT can be controlled through the DAC outputs which are well bias and brightness matched to the LM2479 and LM2480 integrated bias clampICs. The LM1237 preamp is also designed to be compatible n Spot killer which blanks the video outputs when VCC with the LM246x high gain driver family. falls below the specified threshold n Suitable for use with discrete or integrated clamp, with Black level clamping of the video signal is carried out directly software configurable brightness mixer RGB on the AC coupled input signal into the high impedancepreamplifier input, thus eliminating the need for additional n H and V blanking (V blanking is optional and has clamp capacitors. Horizontal and vertical blanking of the register programmable width) outputs is provided. Vertical blanking is optional and its n Power Saving Mode with 80% power reduction Preamplifier duration is register programmable. n Matched to LM246x driver and LM2479/80 drivers The IC is packaged in an industry standard 24 lead DIPmolded plastic package. Applicationsn Low end 15" and 17" bus controlled monitors with OSD Features n 1024x768 displays up to 85 Hz requiring OSD capability n I2C compatible microcontroller interface n Very low cost systems with LM246x driver with Block and Connection Diagram Internal 254 Character OSD and 20023401 FIGURE 1. Order Number LM1237BAAF/NA


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LM1237.pdf Datasheet