MAX271ENG

Introduction

The MAX271ENG is a low-cost, active filter IC for filtering digital signals for commercial and industrial applications It is ideal for a wide variety of applications including digital audio, video, and communications systems.

The active filter utilizes a wideband input architecture based on advanced mixed-mode signal processing, with a unique real-time adaptive filter algorithm. This filter requires only a single analog input, eliminating the need for a separate analog input filter.

Applications

The MAX271ENG provides digital filtering of digital audio, video and communications signals. It is ideal for a wide variety of applications, including:

• Digital audio: CD, DVD and other forms of audio equipment.
• Video equipment: displays, projectors and monitors.
• Communications equipment: wireless, base stations and modems.
• Industrial applications: motor control and industrial automation.

Working Principle

The MAX271ENG utilizes a real-time adaptive filter algorithm enabling precise digital filtering of even the most complex signals. The algorithm adapts to the signal environment by automatically adjusting filter constants to the specific shape of the signal.

The algorithm utilizes an adaptive delay line filter, which has the advantage of providing a precise frequency response without introducing phase distortion or loss of accuracy.

The filter also utilizes a variable frequency bank of notch filters which provides precise removal of any undesired signals in the signal range. The notch filters are adjustable to adapt to changing signal conditions, providing accurate removal of unwanted signals.

Conclusion

The MAX271ENG is an efficient and cost-effective active filter for a wide variety of digital audio, video, and communications applications. It eliminates the need for a separate analog input filter, and its real-time adaptive filter algorithm enables precise digital filtering of even the most complex signals.