MAX7490CEE+

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The MAX7490CEE+ is a member of Maxim\'s family of active filters. As part of the interface and filterCategory, this active filter is a versatile way to add a variety of filtering functions to a wide range of applications. In this article, we\'ll examine the primary application fields of this filter and the principles behind its operation.

Applications

The MAX7490CEE+ is an operational amplifier and band-stop-active filter that is designed for use in both industrial and consumer applications. Industrial applications of this device include general filtration, such as noise rejection and signal conditioning, as well as medical device applications, specifically for medical imaging. In medical devices, the MAX7490 filters out harmonic distortions that are generated by magnetic resonance imaging (MRI) machines.

The MAX7490CEE+ is also frequently used in consumer applications. This active filter is well suited for audio applications, such as high-frequency noise cancellation in car audio systems, as well as numerous other applications such as AC line EMI filtration and RF interference rejection.

Features and Benefits

The MAX7490CEE+ is a highly configurable active filter that offers a number of features to its users. This device has an adjustable cutoff frequency, with a range of 0.1Hz to 125kHz, enabling users to easily tailor the filter to their specific application. The MAX7490CEE+ also has an adjustable gain of up to 20dB, enabling users to further configure the filter\'s performance to their needs.

The MAX7490CEE+ is designed with low power consumption in mind, with power consumption as low as 5.1μA. This makes this filter ideal for portable applications where power consumption may be a limitation. The MAX7490CEE+ also has a wide input voltage range of 2.7V to 30V, allowing the device to be used in a wide variety of applications. Finally, the MAX7490CEE+ has a low cost relative to the performance it provides, making it an economical choice for active filter applications.

Operating Principles

At a high level, the MAX7490CEE+ is an operational amplifier and band-stop-active filter. This type of active filter works by employing a frequency selective voltage divider, where the divider is formed between two capacitors and a resistor. As input voltage is applied to the circuit, the resistor restricts the current flow, and a voltage is generated across the two capacitors. The two capacitors can be set to react differentially to different frequencies of input voltage. This allows the input voltage to be filtered and the undesired frequencies rejected.

More specifically, the MAX7490CEE+ is a single-pole active filter, meaning that it utilizes one RC pair. This configuration is ideal for low-frequency applications, as this filter has a low-cutoff frequency of 0.1Hz. The adjustable gain feature of the MAX7490CEE+ provides additional control over the filter\'s performance, allowing the user to manually fine tune the filter to reject the exact frequencies they need to, regardless of changes in the environment or application.

Conclusion

The MAX7490CEE+ is a versatile active filter for a wide range of applications. This device is designed for both industrial and consumer applications, and features adjustable gain and cutoff frequencies and low power consumption. As a single-pole active filter, this device is ideally suited for low-frequency applications, such as those in medical imaging and audio applications. In conclusion, the MAX7490CEE+ is an excellent choice for a variety of filtering needs.

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