MAX7439ETP+

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The MAX7439ETP+ is a member of the MAX739x family of two-channel narrow-band active filters, specifically designed for eliminating EMI and EMC interference from signal lines. It allows for signal conditioning in motor control applications, general-purpose signal-processing systems, medical electronics, and much more. It incorporates an adjustable 3-pole filter to minimize signal interference, while eliminating high-frequency noise, and can be programmed via a digital control bus.

The active filter works in four distinct stages. First, it acts as a high-pass filter, blocking low-frequency signals and allowing higher-frequency signals to pass through. Then, a low-pass filter eliminates both unwanted AC and DC signals, while allowing the desired signal to pass. The third stage is a band-stop filter which forms a notch around a specific frequency, allowing all input signals but one to be attenuated. Finally, the fourth stage is a low-pass filter that blocks out any remaining high-frequency signals.

The MAX7439ETP+ active filter was designed for two or three-channel signal-processing applications such as motor control, video signal processing and bio-medical electronic systems. Using the adjustable 3-pole filter, the filter can be tuned to precisely minimize EMI and EMC common-mode and differential-mode interference from signal lines. High-frequency noise can be rejected, while preserving the desired signal, eliminating the need for additional external components such as capacitors and inductors. Additionally, the filter can be programmed via a digital control bus for enhanced accuracy and flexibility.

In terms of performance, the MAX7439ETP+ active filter can achieve a noise rejection rate of up to 70 dB at both the input and output terminals. It also features an adjustable gain of up to 20 dB across the passband. The filter has a wide operating temperature range between -40°C to +125°C and a low power consumption of only 72mW. This makes it ideal for a wide range of applications including industrial, automotive, consumer, medical and aerospace.

Overall, the MAX7439ETP+ active filter is extremely versatile, allowing for adjustable 3-pole filtering of signal lines. It features a wide operating temperature range, low power consumption and adjustable gain of up to 20 dB across the passband. With its ability to be programmed via a digital control bus, this active filter is a great choice for two or three-channel signal-processing applications such as motor control and bio-medical electronic systems where signal conditioning is needed to eliminate EMI and EMC interference.

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