The LM1262 is an integrated CMOS CRT pre-amp that supports the I2C interface and allows direct control of all the parameters necessary to set up 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 pre‑amplifier designed for CRT displays. It provides I²C‑compatible control of gain, contrast, brightness and black‑level clamping, and can be used with the LM246X driver family.
Key features include four external 8‑bit DACs for bias and brightness control, vertical‑blank‑synchronized updates, power‑save mode with up to 80 % reduction, and a 24‑lead DIP package. The datasheet lists absolute maximum ratings, video signal characteristics, OSD and DAC electrical parameters, pin descriptions, register maps, and mechanical dimensions.
| Video Amplifier Bandwidth (‑3 dB) | 200 MHz |
|---|---|
| Supply Voltage (Vcc) Range | 4.75 V – 5.25 V |
| Maximum Junction Temperature | 150 °C |
| Video Input Voltage Range | 0.0 V – 1.0 V |
| Video Signal Output Amplitude | 2 Vp‑p |
| Package Type | 24‑lead DIP molded plastic |
The device is rated for a maximum junction temperature of 150 °C.
It provides four external 8‑bit DACs for bus‑controlled bias and brightness.
A 4.7 kΩ series resistor must be used on pin 13 for vertical blanking input.
The LM1262 comes in a 24‑lead DIP molded plastic package.