NATIONAL SEMICONDUCTOR LM4918 Stereo Audio Amplifier with AGC Control
Summary
This integrated circuit is a powerful stereo audio amplifier designed for high-quality, low-noise sound in portable and desktop devices. Featuring Automatic Gain Control (AGC) and bridged output capability, it delivers robust performance with minimal external components. The included documentation details its electrical characteristics, operation parameters, efficiency, and suitability for multimedia monitors and portable radios requiring reliable audio solutions.
Manual Details
| Brand | National |
|---|---|
| Pages | 17 |
| File Size | 646.58 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What is the typical output power of this amplifier?
It can produce 1W into 8Ω with less than 1.0% THD.
Does it have adjustable gain control?
Yes, it features a 32-step Automatic Gain Control (AGC) module that provides fine volume control (0 to 0.5 dB max).
How is the power consumption managed in standby mode?
It includes an externally controlled, low-power consumption shutdown mode with a measurable stand-by current of 1-2 µA (max).
What applications are suitable for this integrated circuit?
It is optimally suited for multimedia monitors, portable radios, and desktop/portable computer applications.
Does the device incorporate protection features?
Yes, it includes thermal shutdown protection circuitry and "Click and pop" suppression circuitry.