MAX7409CUA+

Overview

The MAX7409CUA+ 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 1Hz 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 an offset adjust pin. The device is housed in an 8-pin µMAX package and functions within a temperature range of 0°C to +70°C.

Feature Summary

• Provides a fifth-order Bessel lowpass response for fast settling and minimal overshoot
• Supports both self-clocking via external capacitor and external clock inputs
• Includes a dedicated shutdown pin to minimize power consumption
• Features an adjustable DC output level through the offset adjust pin

Applications

• ADC anti-aliasing
• DAC postfiltering
• Speech processing

Procurement Notes

Verify the component against official Analog Devices documentation to confirm the specific Bessel response characteristic and +5V operating voltage requirements. Ensure the ordering suffix matches the required temperature range and packaging format. Cross-reference the datasheet revision history for any updates to electrical parameters or pin configurations before finalizing procurement specifications.

Selection Notes

Select this component when a fixed fifth-order Bessel response is required for applications needing fast settling times. Verify that the system can provide a stable +5V single supply. Confirm that the available clock frequency allows for the desired corner frequency setting within the specified 100:1 ratio. Check if the shutdown functionality aligns with the system's power management strategy.

Part Context

This part belongs to the MAX7409/MAX7410/MAX7413/MAX7414 family of switched-capacitor filters. The MAX7409 specifically denotes the Bessel response variant designed for +5V operation. Other family members include the MAX7410 (Butterworth, +5V), MAX7413 (Bessel, +3V), and MAX7414 (Butterworth, +3V). All share similar pinouts and operational principles.

Replacement Considerations

Direct replacements within the same family include the MAX7409EUA for extended temperature ranges. For different responses, consider the MAX7410CUA+ for Butterworth characteristics. Ensure any substitute maintains the 8-pin µMAX package and compatible supply voltage requirements.