The LM4990ITLX is a high-performance, fully differential audio power amplifier designed for demanding applications. Manufactured by National Semiconductor (now Texas Instruments), this amplifier delivers high-quality audio output while minimizing external components. Its differential architecture provides excellent common-mode noise rejection and reduces pop and click artifacts.

Applications:

• Portable Media Players
• Cell Phones
• Laptop Computers
• Tablet Computers
• Headphones

Features:

• Fully Differential Architecture: Provides excellent common-mode noise rejection.
• High Power Output: Delivers substantial audio power for demanding applications.
• Low THD+N: Ensures high-fidelity audio reproduction.
• Integrated Pop & Click Suppression: Minimizes audible artifacts during power-up and shutdown.
• Shutdown Mode: Reduces power consumption in idle states.

Benefits:

• Superior Audio Quality: Provides a clean and immersive listening experience.
• Extended Battery Life: Efficient operation minimizes power consumption.
• Simplified Design: Reduces external component count, saving board space.
• Robust Performance: Ensures stable operation in noisy environments.
• Reduced Audible Artifacts

Additional Details:

The LM4990ITLX is typically packaged in a 16-pin WQFN package. It operates from a single 3V to 5.5V power supply. The amplifier delivers 1W into an 8Ω load with a 5V supply, and a THD+N of less than 1%. Its gain is typically set externally with resistors, allowing for flexible configuration. Proper PCB layout is critical to achieve optimal performance and minimize noise. The amplifier's integrated protection features, such as over-temperature and short-circuit protection, enhance its reliability.