MAX7424EUA+

Overview

The MAX7424EUA+ is a fifth-order, low-pass switched-capacitor filter (SCF) from the MAX7418–MAX7425 series. It provides a Butterworth response with a maximally flat passband and operates from a single +3V supply. The device draws 3mA in operating mode and features a shutdown current of 0.2μA. Corner frequencies are adjustable from 1Hz to 45kHz using a 100:1 clock-to-corner ratio. Key electrical parameters include an output offset voltage of ±4mV, a power-supply rejection ratio (PSRR) of 70dB, and a typical insertion gain of -3.0dB at the corner frequency.

Feature Summary

• Butterworth filter response providing a maximally flat passband for instrumentation applications
• Clock-tunable corner frequency range spanning 1Hz to 45kHz
• Low-power operation with a dedicated shutdown mode reducing current to 0.2μA
• Single-supply compatibility with internal mid-supply biasing

Applications

• ADC anti-aliasing filtering
• DAC post-filtering
• CT2 base stations
• Speech processing

Procurement Notes

Verify the component authenticity by checking the manufacturer's marking against official datasheet specifications. Confirm the package type matches the required footprint and ensure the temperature grade aligns with system requirements. Cross-reference the ordering suffix to confirm RoHS compliance status as indicated in the documentation.

Selection Notes

Select the MAX7424EUA+ when a maximally flat passband response is required for signal conditioning. Ensure the system operates within the specified +3V supply range. Verify that the external clock frequency can be set to achieve the desired corner frequency within the 100:1 ratio constraint. Consider the thermal performance if operating near the upper temperature limit.

Part Context

The MAX7424EUA+ belongs to the MAX7418–MAX7425 family of fifth-order low-pass switched-capacitor filters. This series includes elliptic, Bessel, and Butterworth variants. The 'E' suffix denotes an extended temperature range of -40°C to +85°C, while the 'UA' indicates an 8-pin μMAX package. The '+' suffix signifies lead-free and RoHS compliance.

Replacement Considerations

Direct replacements within the same family include the MAX7424CUA for commercial temperature ranges or other SCF models like the MAX7419/MAX7423 for Bessel responses. For different supply voltages, consider the MAX7418–MAX7421 series which operates at +5V.