MP7722DF-LF-Z

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MP7722DF-LF-Z Application Field and Working Principle

The MP7722DF-LF-Z is a member of the 7 Series of low noise audio amplifiers developed by Fairchild. This versatile line of audio amplifiers can be used in a wide range of applications, notably those requiring low-level signal amplification. The MP7722DF-LF-Z is a single-ended mono high fidelity driver/amplifier, capable of providing up to 250 mW into an 8Ω load.

Applications

The MP7722DF-LF-Z is especially suitable for use in systems where low noise and high fidelity is a priority. It can be used in the audio-output stage of a variety of consumer electronics, such as portable radios, personal music players and mini-stereos. It is also ideal for audio applications that require amplifying signals from magnetic headphones, miniature speakers and dynamic microphones. Some other applications these amplifiers are suitable for include home audio, automotive audio and some industrial audio applications.

Features

The device features integrated short-circuit protection and over-current protection, reducing the risk of component damage. It also has an EMI noise filter, incorporated to reduce interference, while the differential input stage allows it to receive wide variety of audio signals, providing excellent wide-frequency response and low-distortion. Furthermore, its high power-to-size ratio allows it to fit into tight spaces, making it an attractive choice for design engineers.

Working Principle

The MP7722DF-LF-Z is an operational amplifier that combines an input stage, a power amplifier (PA) and a low-noise amplifier (LNA). The illustrated figures show the PA and LNA are connected in parallel, connecting their outputs to the output terminal of the device for improved noise and distortion. The non-inverting input of the device uses a differential amplifier, which offers wide bandwidth and low-distortion, while the differential output connects the PA and LNA in parallel, allowing both stages to be simultaneous active on the audio output.

To improve performance, the PA and LNA are designed with complimentary symmetrical (omnifarious) biasing. The input bias current is controlled by the collector current of a matched pair of bipolar transistors, and the output bias current is controlled by a matched IC current source. These bias controls optimize stability, reduce distortion and increase efficiency. The output of the PA and LNA are then combined using a parallel output stage, resulting in a superb gradient and excellent sound quality.

Conclusion

In conclusion, the MP7722DF-LF-Z is a versatile and powerful mono-channel audio amplifier suitable for a variety of audio applications, particularly those requiring low noise and high fidelity. It features integrated short-circuit protection and over-current protection, along with a differential input stage to receive wide variety of signals. Its combination of a PA and an LNA in a complimentary symmetrical (omnifarious) biasing configuration provides excellent wide-frequency response and low-distortion, while its high power-to-size ratio makes it perfect for projects that require a compact design.

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