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NCP2811AFCT1G Application Field and Working Principle

The NCP2811AFCT1G is a voltage-feedback audio amplifier highly optimized for driving a low-impedance 1100 Ω headphone or telephone. It was manufactured by ON Semiconductor and marketed for many different electronic applications such as Bluetooth stereo audio systems, portable and automotive audio systems.

This chip uses a true-differential input stage with an electrometer amplifier, an optimized internal voltage follower, and an optimized output stage. Its design allows it to provide low distortion, low noise, and excellent linearity. It also offers low dynamic output stages and low quiescent current, making it suitable for battery-powered applications.

Functional Description

The NCP2811AFCT1G is a high performance, wide-bandwidth, voltage-feedback audio amplifier. It integrates a number of active functions into a single package that is optimized for driving a 1100 Ω headset. It has a wide range of frequency response and can drive up to 10 watts RMS into a 4-ohm load. It is capable of delivering 62 dB of gain with a maximum output power of 20 watts.

In addition to the standard features of a voltage-feedback amplifier, the NCP2811AFCT1G also features an optimized differential input stage coupled with an electrometer amplifier, along with an additional input stage optimized for driving a low-impedance headset. It is further optimized for flat frequency response, wide bandwidth, low distortion, low noise, and high linearity.

Operation Principle

The NCP2811AFCT1G amplifier consists of a true-differential input stage, an electrometer amplifier, an optimized voltage follower, and an optimized output stage. The purpose of the true-differential input stage is to reject any external noise and interference and maintain the maximum linearity. The electrometer amplifier amplifies the differential signal and provides the input stage with excellent high-frequency response and wide dynamic range.

The optimized voltage follower amplifies the signal and is followed by an output stage. The output stage adjusts the voltage and current of the output signal. The combination of these stages produces a low distortion, low noise, and excellent linearity. The optimized output stage also features a low quiescent current, making it suitable for battery-powered applications.

Applications

The NCP2811AFCT1G can be used in a variety of applications including personal stereo, laptop computers, handheld audio players, and Bluetooth stereo audio systems. It can also be used in automotive audio applications such as in-dash receivers and amplifiers, as well as portable devices such as portable radios and PA systems. The amplifier’s low quiescent current makes it suitable for battery-powered applications, making it ideal for applications such as battery-powered Bluetooth headsets.

Conclusion

The NCP2811AFCT1G is a voltage-feedback audio amplifier optimized for 1100 Ω speakers or headphones. It features a true-differential input stage coupled with an electrometer amplifier, an optimized voltage follower, and an optimized output stage. It provides low distortion, low noise, and excellent linearity. It is suitable for a wide range of audio applications including Bluetooth stereo audio systems, portable audio systems, automotive audio systems, and battery-powered applications.

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