The document introduces the features and characteristics of LM1253A Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator.
The LM1253A is a monolithic triple 180 MHz CRT pre‑amp with an integrated analog on‑screen‑display (OSD) generator. It provides programmable brightness, contrast, and vertical blanking control, and interfaces with the LM2453 driver via a VideoPlex multiplexed video signal.
The document includes block diagrams, absolute maximum ratings, electrical characteristics, pin descriptions, OSD operation, micro‑controller interface details, address maps, and character font tables, along with mechanical dimensions and package information.
| Maximum Pixel Clock | 92.2 MHz |
|---|---|
| Maximum Supply Current | 245 mA |
| Package Type | 28‑lead DIL molded plastic |
| Operating Supply Voltage (VCC) | +5 V |
The LM1253A supports a maximum pixel clock of 92.2 MHz.
The device can draw up to 245 mA of supply current under test conditions with no output load.
It is supplied in a 28‑lead wide‑body DIL molded plastic package.