LM1262 is a 200MHz I2C compatible RGB video amplifier system with OSD and DACs. The IC is I2C compatible and 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, and is well matched to the LM2479 and LM2480 integrated bias clamp IC. The LM1262 pre-amp is designed to work in cooperation with the LM246X high gain driver family. Black level clamping of the signal is carried out directly on the AC coupled input signal into the high impedance pream- plifier input, thus eliminating the need for additional black level clamp capacitors. The IC is packaged in an industry standard 24-lead DIP molded plastic package.
The LM1262 is an integrated CMOS CRT pre‑amp that provides I²C‑compatible control of gain, contrast, brightness and black‑level clamping for RGB video displays. It works with the LM246X driver family and includes four external 8‑bit DACs for bias and brightness control, as well as on‑screen‑display (OSD) functionality.
The device is supplied in a 24‑lead DIP package, operates from a 4.75 V‑5.25 V supply, and offers a video bandwidth of 200 MHz. Power‑save mode reduces consumption by about 80 %. Detailed electrical characteristics, register maps, timing diagrams and mechanical dimensions are provided for designers.
| Supply Voltage (VCC) | 4.75 V – 5.25 V |
|---|---|
| Rise Time (10 %‑90 %) | 19 ns |
| Fall Time (90 %‑10 %) | 20 ns |
| Power‑Save Mode Reduction | 80 % power reduction |
| Package | 24‑lead DIP molded plastic |
| Operating Temperature Range | -65 °C to +150 °C |
| Video Output Level | 2 Vp‑p |
Power‑Save (Green) mode reduces power consumption by about 80 %.
It is supplied in a 24‑lead DIP molded plastic package.
DAC 3 is accessed at I²C address 06h.