MAX7401EPA+

Overview

The MAX7401EPA+ is an 8th-order, lowpass, Bessel switched-capacitor filter operating from a single +5V supply. It features a clock-to-corner frequency ratio of 100:1, allowing corner frequencies from 0.001kHz to 5kHz. The device draws 2mA in operating mode and 0.2µA in shutdown mode. Key electrical parameters include a typical Total Harmonic Distortion plus Noise (THD+N) of -82dB, an output offset voltage of ±5mV, and a maximum resistive output load drive of 10kΩ. It operates within a temperature range of -40°C to +85°C.

Feature Summary

• Provides 8th-order lowpass Bessel filtering with fast settling times and low overshoot for multiplexer applications.
• Offers flexible clocking options via internal oscillator or external clock input for precise corner-frequency control.
• Includes a dedicated shutdown pin to reduce power consumption significantly when the device is not in use.

Applications

• ADC anti-aliasing
• Post-DAC filtering
• Speech processing

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm package integrity and pin alignment upon receipt. Check datasheet revisions for any updates to electrical characteristics or ordering information before finalizing procurement specifications.

Selection Notes

Select this component for designs requiring high-order filtering with minimal phase distortion. Ensure the system clock frequency aligns with the desired 100:1 ratio to achieve target corner frequencies. Verify that the single-supply voltage matches the +5V requirement for the MAX7401 variant specifically.

Part Context

This part belongs to the MAX7401/MAX7405 family of switched-capacitor filters. The MAX7401 variant is designed for +5V operation, while the MAX7405 supports +3V supplies. Both share identical filtering characteristics but differ in supply voltage requirements and specific oscillator constants.

Replacement Considerations

Direct substitutes include other Maxim Integrated 8th-order Bessel switched-capacitor filters. Verify pin compatibility and supply voltage ranges when considering alternative models from different manufacturers.

FAQ

How is the corner frequency determined?

The corner frequency is set by the clock frequency divided by 100. It can be controlled using an external capacitor for the internal oscillator or an external clock signal.

What is the purpose of the OS pin?

The OS pin allows for adjustment of the DC output level. Connecting it to COM disables offset adjustment, while applying an external bias voltage enables DC level shifting.

Can the device operate with dual supplies?

Yes, dual supplies can be used by connecting the COM pin to system ground and GND to the negative supply, maintaining equivalent performance to single-supply operation.