AN7164

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The AN7164 is an audio linear amplifier IC (Integrated Circuit), specifically designed for portable devices and other applications where high output power and compact design are essential. It is a two stage amplifier IC, which can deliver up to 1W of output power at a 4Ω impedance level. The AN7164 IC allows the user to adjust the gain and the cutoff frequency of the audio input by using external components. This feature makes it very suitable for applications such as personal audio systems, portable radios, and battery powered audio amplifiers.

The AN7164 is an integrated circuit composed of two transistors in an NPN-PNP configuration with an input differential amplifier stage. The transistors are placed in an NPN-PNP configuration so that the differential pair can respond to a wide range of input signals from both high and low-end audio sources. The differential pair is biased by external components such as resistors, capacitors, and diodes. The differential output is then fed to the power amplifier stage, which is composed of one N-channel and one P-channel MOSFET (Metal Oxide Semiconductor Field Effect Transistor). The MOSFETs are used to drive the output to the speaker.

The power from the MOSFET amplifier stage is further enhanced by the addition of an output filter. The filter reduces the level of harmonic distortion in the output power and also helps to protect the speaker from overload. The output filter is composed of resistors, capacitors and inductors.

The AN7164 IC also includes a shutdown feature which disables the amplifier when the audio input levels reaches a certain level. This function is useful in cases where power supply voltage is not stable and can help protect the speaker from excessive distortion or overload. The AN7164 also includes a battery-saver mode which reduces the current drain when the audio input is low.

The AN7164 is an ideal IC for portable audio applications due to its low power consumption, high output power and compact design. With its wide range of features, the AN7164 is suitable for a variety of audio systems from personal audio devices to home stereo systems and professional applications.

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