LM4838GR

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LM4838GR Application Field and Working Principle

The LM4838GR is a one-chip audio power amplifier using the National Semiconductor 28-SOP hermetically sealed package. The integrated circuit of the same series (IC) is packaged in a 28-pin plastic SOIC package. The LM4838GR is a biased symmetrical boost/cut type audio power amplifier circuit for controlling the level and tone of a stereo audio signal with a selector switch. The main application field of the LM4838GR is bipolar cassette players, MP3 players and other portable audio devices.

Features

The LM4838GR features a 19dB boost/cut type amplifier with a gain of 30dB. It is designed with a low distortion, low noise, and high signal to noise ratio, as well as a low voltage operation and low power consumption. Additionally, it features a wide range of adjustable frequency response due to its broad frequency response range. Its low-noise output and high slew rate ensure a clear, accurate signal processing performance, while its low impedance output enables an efficient, low impedance connection to the speaker.

Working Principle

The LM4838GR is a one-chip amplifier circuit specifically designed for controlling the level and tone of a stereo audio signal. The signal is first amplified in the input amplifier and then enters the tone and gain controls. The gain control sets the overall gain, while the tone control adjusts the bass and treble frequencies. The signal then travels through a low-noise output amplifier, which increases the signal strength before being applied to the output. The output then passes through an output buffer, which attenuates the signal to a lower amplitude before the final signal is sent to the speaker. Finally, a power amplifier is used to drive the speaker with the required signal level.

Conclusion

The LM4838GR is a one-chip audio power amplifier designed for controlling the level and tone of a stereo audio signal. It features a low distortion, low noise, and high signal to noise ratio, as well as a wide range of adjustable frequency response and low power consumption. The signal is amplified in the input amplifier and then travels through a tone and gain control stage, before being outputted through a low-noise output amplifier, attenuated by the output buffer and driven by the power amplifier. The LM4838GR is most commonly used in portable audio devices such as cassette players and MP3 players.

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