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LM1238 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI) |
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LM1238 bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI) |
1 / 24 page LM1238 110 MHz I 2C Compatible RGB Preamplifier with Internal Simple OSD Generator and 4 DACs General Description The LM1238 pre-amp is an integrated, three channel video pre-amp. 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. Four I2C compatible DACs are available to control monitor bias and brightness circuits. The LM1238 preamp is designed to be 100% compatible with the LM246x high gain driver family and the LM2479/80 Clamp ICs. Black level clamping of the video signal is carried out directly on the AC coupled input signal into the high impedance pre-amplifier inputs, eliminating the need for additional clamp capacitors. Horizontal and vertical blanking of the outputs is provided. Vertical blanking is optional and its duration is register programmable. Features n I 2C compatible microcontroller interface n Internal OSD generator with 16 sets of color icons n OSD override allows OSD messages to be displayed while blanking input video n Internally generated burn-in screen n 4 DAC outputs (8-bit resolution) for bus controlled CRT bias and brightness n Spot killer which blanks the video outputs when V CC falls below the specified threshold n Suitable for use with discrete or integrated clamp, with software configurable brightness mixer n H and V blanking (V blanking is optional and has register programmable width) n Power Saving Mode with 65% power reduction n Matched to LM246x driver and 2479/80 clamp Applications n Low end 15" and 17" bus controlled monitors with OSD n 1024x768 displays up to 85 Hz requiring OSD capability n Very low cost systems with LM246x driver Block and Connection Diagram 20038701 FIGURE 1. Order Number LM1238AAC/NA See NS Package Number N24D June 2003 © 2003 National Semiconductor Corporation DS200387 www.national.com |
Số phần tương tự - LM1238 |
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Mô tả tương tự - LM1238 |
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