Key facts
- Model
- LM125
- Category
- Other Electronics
- Documents
- 3
- Languages
- EN
- Last added
- 2012-04-05
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National Semiconductor LM1253A Datasheet
The LM1253A is a monolithic triple 180 MHz CRT pre‑amplifier with an integrated analog on‑screen‑display (OSD) generator. It provides I²C‑controlled brightness and contrast adjustment, programmable vertical blanking, and a VideoPlex interface for bias control, all in a 28‑lead wide‑body DIL package.
Key features include two‑color and four‑color ROM character fonts, programmable display windows, up to 960‑pixel line resolution, and extensive programmable parameters such as OSD palette, pixel clock, and blanking levels. The datasheet provides detailed electrical characteristics, pin descriptions, test settings, and interface diagrams for system integration.
National Semiconductor LM125 specifications
| Maximum pixel clock | 92.2 MHz |
|---|---|
| Maximum supply current | 245 mA |
| Package type | 28‑lead wide‑body DIL |
All National Semiconductor LM125 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the maximum pixel clock frequency of the LM1253A?
The maximum pixel clock is 92.2 MHz.
How many character fonts does the LM1253A support?
It supports 190 two‑color ROM based character fonts and 64 four‑color ROM based character fonts.
What is the maximum pixel clock frequency of the LM1253A?
The LM1253A supports a maximum pixel clock of 92.2 MHz.
What is the maximum supply current for the LM1253A?
The device can draw up to 245 mA of supply current under test conditions with no output load.
What is the maximum output current of the LM125 series regulators?
The regulators can supply up to 100 mA of output current.
From: National Semiconductor LM125/LM325/LM325A/LM126/LM326 Voltage Regulator Datasheet
What line regulation does the device provide?
The line regulation is specified as 0.06 %.
From: National Semiconductor LM125/LM325/LM325A/LM126/LM326 Voltage Regulator Datasheet