MAX7400CPA+

Overview

The MAX7400CPA+ is an 8th-order, lowpass, elliptic switched-capacitor filter operating from a single +5V supply. It features a clock-to-corner frequency ratio of 100:1, allowing corner frequencies from 1Hz to 10kHz. The device provides -82dB stopband rejection with a transition ratio of 1.5 and draws 2mA in operating mode. A shutdown mode reduces current to 0.2µA. It includes an offset adjustment pin (OS) for DC level control and operates within a temperature range of 0°C to +70°C in an 8-pin PDIP package.

Feature Summary

• Provides 8th-order lowpass elliptic filtering with sharp rolloff characteristics
• Supports both self-clocking via external capacitor and external clock inputs
• Includes a dedicated offset adjustment pin for precise DC output level tuning
• Features a low-power shutdown mode that significantly reduces supply current

Applications

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

Procurement Notes

Verify the component matches the specific Analog Devices/Maxim Integrated part number MAX7400CPA+. Confirm the suffix indicates the standard commercial temperature range and plastic DIP packaging. Ensure authenticity through authorized channels as counterfeit components may exhibit incorrect electrical parameters or physical discrepancies.

Selection Notes

Select this component when an 8th-order elliptic response with high stopband rejection is required. It is suitable for applications needing a fixed filter shape where only the corner frequency needs adjustment via clock signals. Consider the +5V supply requirement and the availability of the PDIP package for through-hole mounting during design integration.

Part Context

This component belongs to the MAX7400 family of switched-capacitor filters, which also includes variants like the MAX7403, MAX7404, and MAX7407. These devices share similar architectures but differ in operating voltage and filter transition ratios. The MAX7400 specifically targets +5V systems requiring steep rolloff characteristics.

Replacement Considerations

Direct substitutes include other members of the MAX7400 family such as the MAX7403, though differences in transition ratio and stopband rejection must be evaluated. Cross-family replacements require careful verification of switching capacitor architecture compatibility and supply voltage requirements.