AFE1105E

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Data Acquisition - Analog Front End (AFE) is an important part of the signal processing chain. It is responsible for providing an interface between the analog world and the digital world. AFE1105E is one of the popular AFEs used in many applications. It is equipped with a low noise fully differential front-end, followed by two programmable gain blocks, and a reference buffer. This article discusses the application field and working principle of AFE1105E.

Application of AFE1105E

AFE1105E is a high performance, multi-channel Analog Front End (AFE) for the detection of low frequency signals, usually in the range of zero to 10kHz. This makes it suitable for applications such as vibration monitoring, seismology, and structural health monitoring. It is also used in ultrasonic imaging and tablet computer input interfaces.

AFE1105E also provides built-in solutions such as thermal integrity monitoring and sensor parameterization, making it an ideal choice for applications including medical instrumentation, portable power generation systems, industrial control systems, environmental monitoring, and haptics. Its features are packed in a 44-pin TQFP surface-mount package, making it compact and energy efficient.

Working Principle of AFE1105E

The AFE1105E consists of three sections: a differential front-end, programmable gain stages, and a reference buffer. The differential front-end offers low noise performance, selectable gain, and signal-to-noise ratio (SNR) of up to 80dB. This is followed by two programmable gain blocks, which offers 12 different gains ranging from 20dB to 70dB. This is complemented by a reference buffer which provides power supply and common mode noise immunity.

The differential front-end of the AFE1105E amplifies the input signal and converts it from single ended to a fully differential signal. This signal is then amplified using the programmable gain stages. These gain blocks can be used to adjust the signal level to optimize noise performance. The output of the gain stages is then fed to the reference buffer which further helps to reduce the noise levels. Finally, the signal is output as a single ended voltage.

Conclusion

In conclusion, the AFE1105E is an Analog Front End that is designed for low frequency signal application. It offers a wide range of features such as low noise performance, selectable gain, and power supply and common mode noise immunity. It is suitable for a variety of applications such as medical instrumentation and structural health monitoring. Through the use of its differential front-end, programmable gain stages, and reference buffer, it is able to guarantee improved SNR and accurate signal detection.

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