LM4864M/NOPB

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Introduction

LM4864M/NOPB is a monolithic IC intended for use in audio applications like portable radios, cassette players, clock radios, video games,remote control receivers and other applications requiring low power high quality audio amplification.

Application Field

The LM4864M/NOPB is capable of directly driving low impedance headphones as well as providing a 3.2Vrms signal to an external power amplifier. The device consists of an input noise bypass capacitor and a high gain amplifier with differential input stage. A mute and shutdown pin are included for power and noise control. The entire device is contained in a single SOIC package and requires few external components for operation. Typical application circuits can be found in the LM4864M/NOPB datasheet.

Working Principle

The LM4864M/NOPB uses a high gain, differential input stage with a unity gain buffer for output buffering. The input stage provides high common mode and differential gain stability, as well as increased input impedance stability, thus maintaining maximum fidelity of the input signal. The differential input stage also eliminates the need for costly isolation components, thereby simplifying the design. The signal passes through a 0.01μF noise bypass capacitor (which should be connected between the input and ground) to reduce the noise and increase signal fidelity. The signal is then internally buffered and amplified by the LM4864M/NOPB before being output to the load.

The LM4864M/NOPB also contains a built-in mute circuit that can be used to reduce noise when no input signal is present, or when the input signal is below the noise floor. This mute circuit can also be used to power down the device without having to physically unplug the device. Additionally, the LM4864M/NOPB contains thermal protection circuitry, which helps protect the device from overheating. This feature is especially important when using the device in portable applications.

Conclusion

The LM4864M/NOPB is a versatile low power IC intended for audio applications in both consumer electronics and automotive applications. The device has a high gain, differential input stage and provides output buffering with thermal protection, mute and shutdown features. It requires few external components and can directly drive low impedance headphones or provide signals to external power amplifiers, with a 3.2Vrms output.

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