NJM2770RB1-TE1 Integrated Circuits (ICs)

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The NJM2770RB1-TE1 is an audio amplifier specialized for mobile audio applications. It is a +/-6.8 dB gain linear amplifier that can drive a maximum of 32 Ohm speaker with a frequency response between 20 Hz and 20 kHz. The dual-channel amplifier offers high-fidelity sound, low distortion and high efficiency. This article will discuss the application field and working principle of the NJM2770RB1-TE1.

The application field of the NJM2770RB1-TE1 is mainly audio in portable electronics, such as notebook computers, mobile phones and portable media players. The amplifier is designed to be low power and to consume only a few milliamps, making it suitable for mobile applications. The high quality sound output enables a pleasing listening experience without taking up too much power. The amplifier is also designed to be relatively small in size, allowing it to fit in even the most space-constrained environment.

The working principle of the NJM2770RB1-TE1 is based on the classic differential-input Class AB amplifier configuration. The differential-input allows for a low distortion operation, while the Class AB configuration allows the amplifier to achieve a high level of efficiency. The amplifier itself is built with two signal channels – one for the left audio signal and one for the right signal. Each signal channel has a differential-input stage, which is responsible for amplifying the signal level, followed by a power stage, which is responsible for driving the speaker.

The differential-input stage is a two-stage amplifier, composed of a low-noise pre-amplifier and an intermediate-frequency amplifier. The pre-amplifier is designed to amplify the signal without introducing much noise, while the intermediate-amplifier is designed to further amplify the signal. The power stage of the amplifier is composed of a low-dropout linear regulator and a driver stage. The regulator is designed to provide a stable power supply to the amplifier, and the driver stage is responsible for driving the speaker. The amplifier also includes two temperature compensation circuits, which helps minimize distortion due to thermal variations.

In summary, the NJM2770RB1-TE1 is an audio amplifier designed for mobile audio applications. It features +/-6.8 dB gain, a frequency response between 20 Hz and 20 kHz, and low distortion. The amplifier is capable of driving a maximum of 32 Ohm speakers and it is low power, making it suitable for mobile applications. The working principle of the amplifier is based on a differential-input Class AB amplifier configuration, and it includes two signal channels, each with a differential-input stage and a power stage.

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