MAX7427EUA+

Overview

The MAX7427EUA+ is a fifth-order, lowpass, elliptic switched-capacitor filter designed for single-supply operation at +3V. It provides sharp rolloff with a transition ratio of 1.25 and typically 37dB stopband rejection. The device operates from a supply voltage range of 2.7V to 3.6V, drawing 0.8mA in active mode and 0.2µA in shutdown mode. Corner frequencies are tunable from 0.001kHz to 12kHz via a 100:1 clock-to-corner ratio using either an internal oscillator or external clock. Key electrical parameters include ±4mV output offset voltage, -79dB THD plus noise, and a maximum capacitive load of 500pF at the output.

Feature Summary

• Provides steep attenuation characteristics suitable for anti-aliasing and post-DAC filtering applications
• Supports flexible clocking options including self-clocking via external capacitor or external clock input
• Includes dedicated offset-adjust pin for DC output level tuning

Applications

• ADC Anti-Aliasing
• Post-DAC Filtering
• Speech Processing

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm package integrity and absence of physical damage upon receipt. Cross-reference ordering information against official datasheets to ensure correct suffix alignment. Maintain proper electrostatic discharge handling procedures during storage and installation.

Selection Notes

Select this variant specifically for +3V single-supply systems requiring elliptic filter response. Ensure clock frequency selection aligns with the desired corner frequency within the specified operational range. Verify that input signal amplitudes remain within limits to maintain optimal signal-to-noise performance.

Part Context

This component belongs to the MAX7426/MAX7427 family of switched-capacitor filters. The MAX7427 variant is distinguished by its +3V operating voltage requirement, whereas the MAX7426 supports +5V supplies. Both share identical filter topology and performance metrics.

Replacement Considerations

Public confirmed substitute part numbers only; omit otherwise.