LM1247AAG/NA

Product Summary

The LM1247AAG/NA 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 LM1247AAG/NA preamp is also designed to be compatible with the LM246x high gain driver family.

Parametrics

LM1247AAG/NA absolute maximum ratings: (1)Supply Voltage VCC, Pins 10 and 18: 6.0V; (2)Peak Video DC Output Source Current (Any One Amp) Pins 19, 20 or 21: 1.5 mA; (3)Voltage at Any Input Pin (VIN): VCC +0.5 ≥ VIN ≥ -0.5V; (4)Video Inputs (pk-pk): 0.0 ≤ VIN ≤ 1.2V; (5)Thermal Resistance to Ambient (θJA): 51℃/W; (6)Power Dissipation (PD) (Above 25℃ Derate Based on θJA and TJ): 2.4W; (7)Thermal Resistance to case (θJC): 32℃/W; (8)Junction Temperature (TJ): 150℃; (9)ESD Susceptibility: 3.0 kV; (10)ESD Machine Model: 350V; (11)Storage Temperature: -65℃ to +150℃; (12)Lead Temperature (Soldering, 10 sec.): 265℃; (13)Operating Ratings Temperature Range: 0℃ to +70℃; (14)Supply Voltage: VCC 4.75V ≤ VCC ≤ 5.25V; (15)Video Inputs (pk-pk): 0.0V ≤ VIN ≤ 1.0V.

Features

LM1247AAG/NA features: (1)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; (2)Internal 512 character RAM, which can be displayed as one single or two independent windows; (3)I2C compatible microcontroller interface; (4)OSD override allows OSD messages to override video and the use of burn-in screens with no video input; (5)4 DAC outputs (8-bit resolution) for bus controlled CRT bias and brightness; (6)Spot killer which blanks the video outputs when VCC falls below the specified threshold; (7)Suitable for use with discrete or integrated clamp, with software configurable brightness mixer; (8)Horizontal blanking and OSD synchronization directly from deflection signals. The blanking can be disabled, if desired; (9)Vertical blanking and OSD synchronization directly from deflection signals. The blanking width is register programmable and can be disabled, if desired; (10)Power Saving Mode with 65% power reduction; (11)Matched to LM246x driver and LM2479/80 bias IC’s.

Diagrams