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MAX7444ESA

MAX7444ESA+T is a low voltage, rail-to-rail input and output precision, single-channel EMI filter. This device has been designed for both the switched-mode power supply (SMPS) and data line filter applications which are exposed to conducted and radiated EMI noise. This device combines both a low pass filter and a differential output stage with a series of connection pins for easy integration with an existing design.

Application Field

The MAX7444ESA+T is an easy-to-use solution for EMI filtering in power supplies and data lines. In power supply applications, the filter can reduce conducted emissions levels, while in data lines it can reduce the EMI generated by the signal path. This filter is ideal for applications such as telecom, industrial and consumer electronics, motor control, and PMIC systems.

Working Principles

The MAX7444ESA+T filter consists of an input low pass filter and an output differential stage. The input filter provides significant attenuation of high frequency signals from the input to the output. The differential output stage provides increased attenuation of even higher frequency EMI signals. This output stage is driven by an input amplifier to increase the dynamic range of the filter.

The input low pass filter is comprised of a series of capacitors, resistors, and inductors. This filter is designed to reject frequencies above 1.3GHz, providing significant reduction of EMI noise. The output differential stage uses two low pass filter networks (LPF)s and an active baseband converter. This stage provides enhanced attenuation at frequencies above 1.3GHz. Together, these two stages provide the efficient reduction of EMI noise.

The MAX7444ESA+T also offers adjustable passive filtering to further reduce EMI noise. Adjustment pins allow for the selection of three different cutoff frequencies (1.3GHz, 3.5GHz, and 7GHz) for the series LPF. By selecting the appropriate cutoff frequency for the application, additional reduction of the EMI noise can be achieved.

Conclusion

The MAX7444ESA+T filter is an easy-to-use solution for reducing EMI noise in power supplies and data lines. This device combines a low pass filter and a differential output stage to provide significant reduction in conducted EMI noise. With adjustable passive filtering and adjustable cutoff frequency, the MAX7444ESA+T offers additional reduction of EMI noise. This filter is an ideal choice for SMPS and data line applications exposed to EMI noise.

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