MAX7423EUA

Overview

The MAX7423EUA is a fifth-order, low-pass switched-capacitor filter (SCF) from the MAX7418–MAX7425 series. It features a Bessel response optimized for low overshoot and fast settling times. The device operates on a single +3V supply with a typical operating current of 3mA and reduces to 0.2μA in shutdown mode. The corner frequency is programmable from 1Hz to 45kHz via an external clock or internal oscillator using a 100:1 ratio. Key electrical parameters include a ±4mV output offset voltage, 70dB power-supply rejection ratio (PSRR), and a maximum capacitive load drive of 500pF. It is housed in an 8-pin μMAX package.

Feature Summary

• Bessel filter response providing linear phase delay and minimal step-response overshoot
• Clock-tunable corner frequency ranging from 1Hz to 45kHz with a fixed 100:1 ratio
• Low-power shutdown mode reducing supply current to 0.2μA
• Integrated offset adjust pin for DC output level tuning

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm temperature range and RoHS compliance status. Confirm that the component meets all required environmental specifications for the intended deployment environment before finalizing procurement decisions.

Selection Notes

Select the MAX7423EUA when a Bessel response is required to preserve signal waveform shape during multiplexed input selection. Ensure the system provides a stable +3V single supply. Verify that the available clock source can support the desired corner frequency within the 1Hz to 45kHz operational range.

Part Context

This component belongs to the MAX7418–MAX7425 family of fifth-order low-pass switched-capacitor filters. While other members offer Elliptic or Butterworth responses, the MAX7423 specifically implements the Bessel characteristic. It shares the same 8-pin μMAX footprint and basic interface requirements as its siblings but differs in frequency response characteristics.

Replacement Considerations

Direct replacements within the same family include the MAX7419EUA, which offers identical Bessel performance but operates at +5V instead of +3V. Cross-voltage substitution requires careful evaluation of supply rail compatibility and common-mode voltage levels.