MAX7409EUA+

Overview

The MAX7409EUA+ is a fifth-order, lowpass switched-capacitor filter with a Bessel response. It operates from a single +5V supply and draws 1.2mA in active mode, reducing to 0.2µA in shutdown. The corner frequency is tunable from 0.001kHz to 15kHz via an external clock or internal oscillator set by a capacitor on the CLK pin. It features a 100:1 clock-to-corner ratio, ±4mV typical output offset, and operates within a -40°C to +85°C temperature range.

Feature Summary

• Bessel filter response for fast settling and low overshoot
• Clock-tunable corner frequency from 1Hz to 15kHz
• Low-power operation with dedicated shutdown mode
• Single-supply +5V operation capability

Applications

• ADC anti-aliasing
• DAC postfiltering
• Speech processing
• CT2 base stations
• Air-bag electronics

Procurement Notes

Verify the component matches the specific Bessel response variant required for your application. Confirm that the operating voltage aligns with the +5V requirement of this part number. Ensure the environmental rating meets the -40°C to +85°C specification. Check for lead-free compliance if mandated by your assembly standards.

Selection Notes

Select this device when a Bessel response is preferred over Butterworth for its linear phase characteristics. Verify that the system can provide a stable clock signal between 100Hz and 1.5MHz to achieve the desired cutoff frequencies. Consider the power consumption constraints, as the shutdown mode offers significant current reduction.

Part Context

This component belongs to the MAX7409/MAX7410/MAX7413/MAX7414 family of fifth-order lowpass switched-capacitor filters. The MAX7409 specifically provides a Bessel response and is designed for +5V single-supply operation. It shares the same package and basic functionality with the MAX7410 (Butterworth) and MAX7413/7414 (+3V variants).

Replacement Considerations

The MAX7410EUA+ serves as a direct pin-compatible alternative offering a Butterworth response instead of Bessel. For applications requiring lower supply voltages, the MAX7413EUA+ provides the same Bessel response but operates at +3V.