MAX7420EUA+

Overview

The MAX7420EUA+ is a fifth-order, low-pass switched-capacitor filter (SCF) featuring a Butterworth response. It operates from a single +5V supply with a typical current draw of 3mA and supports corner frequencies ranging from 1Hz to 45kHz via a 100:1 clock-to-corner ratio. The device provides a maximally flat passband response and includes a shutdown mode reducing current to 0.2μA. It utilizes an internal oscillator or external clock input for frequency control and offers offset adjustment capabilities. The component is housed in an 8-pin μMAX package and is rated for an operating temperature range of -40°C to +85°C.

Feature Summary

• Butterworth filter response providing a maximally flat passband
• Switched-capacitor architecture emulating passive ladder networks
• Low-power shutdown mode with high-impedance output state
• Integrated offset adjust pin for DC level shifting

Applications

• ADC anti-aliasing filtering
• DAC post-filtering
• Instrumentation requiring minimum passband deviation

Procurement Notes

Verify the specific suffix 'EUA' confirms the extended industrial temperature range (-40°C to +85°C) and the 8-pin μMAX package configuration. Ensure the ordering code matches the exact part number required for system compatibility. Confirm RoHS compliance status as indicated by the '+' suffix in the manufacturer's documentation before finalizing procurement orders.

Selection Notes

Select this component when a maximally flat passband response is required for instrumentation applications. It is suitable for systems operating on a single +5V supply. Designers must account for the 100:1 clock-to-corner frequency ratio when determining the necessary clock source frequency to achieve the desired cutoff point within the specified operational range.

Part Context

This component belongs to the MAX7418–MAX7425 family of fifth-order, low-pass switched-capacitor filters manufactured by Analog Devices/Maxim Integrated. While other members of the series offer elliptic or Bessel responses, the MAX7420 variant specifically delivers a Butterworth characteristic. The family shares common interface pins and power requirements, allowing for flexible design integration across different signal processing stages.

Replacement Considerations

The MAX7424CUA serves as a direct functional substitute within the same family, offering identical Butterworth characteristics but limited to the commercial temperature range (0°C to +70°C). Verify that the thermal requirements of the application align with the extended range specifications of the MAX7420EUA+ if substituting with lower-temperature variants.