MAX7401ESA+T

Overview

The MAX7401ESA+T is an 8th-order, lowpass, Bessel switched-capacitor filter (SCF) designed for single-supply operation at +5V. 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 supply voltage range of 4.5V to 5.5V. It operates within a temperature range of -40°C to +85°C and is housed in an 8-pin SO package.

Feature Summary

• Provides 8th-order lowpass Bessel filtering with low overshoot and fast settling times suitable for multiplexed inputs.
• Offers flexible clocking options via internal oscillator or external clock source 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 the specific suffix 'ESA' confirms the industrial temperature range (-40°C to +85°C) and SOIC-8 package type as documented in the official Maxim Integrated ordering information. Ensure the '+T' designation matches the required reel packaging format for surface-mount assembly processes.

Selection Notes

Select this component when a high-order Bessel response is required to preserve step input shapes in data acquisition systems. Consider the 100:1 clock-to-corner ratio for simplified design tasks where only the clock frequency needs selection. Verify that the single +5V supply capability aligns with the system power architecture.

Part Context

This part belongs to the MAX7401/MAX7405 family of switched-capacitor filters. While the MAX7405 operates on a +3V supply, the MAX7401 variant is optimized for +5V systems. The ESA suffix specifically denotes the extended temperature grade and plastic SO package, distinguishing it from commercial grade or DIP variants.

Replacement Considerations

Direct functional substitutes within the same family include the MAX7405 for lower voltage applications. Other orders such as MAX7401CPA or MAX7401EPA offer identical electrical performance but differ in temperature range or physical package style.