MAX291CPA+

Overview

The MAX291CPA+ is an 8th-order, lowpass, switched-capacitor filter with a Butterworth response. It operates within a corner frequency range of 0.1Hz to 25kHz and maintains a clock-to-corner-frequency ratio of 100:1. The device supports dual supplies from ±2.375V to ±5.5V or a single supply from +4.75V to +11V. It features a typical total harmonic distortion plus noise of -70dB and includes an uncommitted operational amplifier for additional filtering tasks. The component is housed in an 8-pin Plastic DIP package and functions reliably across a temperature range of 0°C to +70°C.

Feature Summary

• Provides maximally flat passband response characteristic of Butterworth filters
• Enables dynamic adjustment of the corner frequency through external clock signals
• Integrates an uncommitted operational amplifier for anti-aliasing or post-filtering applications

Applications

• ADC anti-aliasing filter
• DAC post-filtering
• 50Hz/60Hz line-noise filtering
• Noise analysis

Procurement Notes

Verify that the ordering suffix matches the required package type and temperature rating. Confirm RoHS compliance status based on the specific part marking. Ensure the supplier provides valid traceability documentation. Check for any obsolescence notices or lifecycle changes before finalizing procurement plans.

Selection Notes

Select this component when a fixed 8th-order Butterworth response is required. Verify that the application can accommodate the necessary clock frequency generation circuitry. Ensure the power supply voltage falls within the specified operating range. Consider the internal oscillator requirements if an external clock source is not available.

Part Context

This component belongs to the MAX291 series of switched-capacitor filters manufactured by Analog Devices / Maxim Integrated. The series includes variants with different filter responses and temperature ranges. The MAX291 specifically offers the Butterworth response profile suitable for instrumentation requiring minimal passband deviation.

Replacement Considerations

Direct substitutes include other members of the MAX29x family such as the MAX292, which shares the same pinout but provides a Bessel response instead of Butterworth.