LM2409T

Overview

The LM2409T is a monolithic triple CRT driver designed for color monitor applications. It integrates three high input impedance, wide band amplifiers that directly drive RGB cathodes with an internally set gain of -14. The device operates within a supply voltage range of +60V to +85V and accepts a 0V to 5V input range. Electrical characteristics include a typical rise time of 9 ns and fall time of 11 ns. It dissipates approximately 8 mA per channel under no-signal conditions and is housed in an 11-lead TO-220 molded plastic power package.

Feature Summary

• Integrates three high input impedance, wide band amplifiers for direct RGB cathode driving
• Internally fixed voltage gain of -14 per channel
• Stable operation with capacitive loads up to 20 pF and inductive peaking networks
• Compatible with standard LM240X family pinout for simplified PCB layout

Applications

• 1024 x 768 displays with refresh rates up to 70 Hz
• Monitors utilizing video blanking techniques
• Pixel clock frequencies up to 75 MHz

Procurement Notes

Verify component authenticity through authorized distributors or Texas Instruments channels. Confirm the specific ordering suffix matches the required package configuration. Review the latest datasheet for absolute maximum ratings and thermal management requirements before integration. Ensure compliance with applicable environmental regulations relevant to the deployment region.

Selection Notes

Select this component for high-resolution display systems requiring integrated CRT drive capabilities. Evaluate thermal dissipation needs based on operating frequency and load capacitance. Ensure adequate power supply bypassing to prevent oscillation. Verify compatibility with upstream video preamplifiers such as the LM1279 for complete signal chain integration.

Part Context

The LM2409T belongs to the LM240X family of monolithic CRT drivers manufactured by Texas Instruments. It serves as a replacement for discrete CRT driver circuits in color monitor designs. The device consolidates multiple amplifier stages into a single package to reduce board space and simplify design complexity for VGA to XGA resolution markets.

Replacement Considerations

Consult official documentation for cross-reference data regarding legacy discrete solutions or alternative members of the LM240X family.