MAX7425EUA+T

Overview

The MAX7425EUA+T is a fifth-order, low-pass switched-capacitor filter (SCF) from the MAX7418–MAX7425 series. It operates on a single +3V supply and draws 3mA of current in active mode, reducing to 0.2μA in shutdown. The device provides an elliptic response with a sharp rolloff transition ratio of 1.25 and typical stopband rejection of 37dB. Corner frequencies are programmable from 1Hz to 45kHz via a 100:1 clock-to-corner frequency ratio. It features a low output offset voltage of ±4mV and is housed in an 8-pin μMAX package.

Feature Summary

• Elliptic low-pass filter response with a 1.25 transition ratio for steep rolloff
• Programmable corner frequency ranging from 1Hz to 45kHz using external or internal clocks
• Low-power operation with 3mA active current and 0.2μA shutdown current
• Single-supply +3V operation with low output offset voltage

Applications

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

Procurement Notes

Verify the component authenticity by checking the manufacturer markings against official documentation. Confirm the specific suffix indicates the extended temperature range and RoHS compliance status as defined in the ordering guide. Ensure the package type matches the required footprint for your design.

Selection Notes

Select this part when a sharp cutoff is required within a low-voltage system. The elliptic response offers better stopband attenuation than Butterworth or Bessel variants but introduces passband ripple. Ensure the clock source can be synchronized with data converters to prevent beat frequencies.

Part Context

This component belongs to the MAX7418–MAX7425 family of fifth-order switched-capacitor filters. While other members offer different responses like Bessel or Butterworth, the MAX7425 specifically provides an elliptic characteristic optimized for applications requiring high stopband rejection in a compact form factor.

Replacement Considerations

The MAX7422 serves as a direct functional substitute within the same series, sharing the identical elliptic response profile and physical package. The primary distinction lies in the operating voltage requirements; the MAX7422 supports +5V systems whereas the MAX7425 is designed for +3V supplies.