MAX291CWE+

Overview

The MAX291CWE+ is an 8th-order, lowpass, switched-capacitor filter manufactured by Analog Devices Inc./Maxim Integrated. It features a Butterworth response with a clock-tunable corner frequency range from 0.1Hz to 25kHz and a fixed clock-to-corner-frequency ratio of 100:1. The device operates on a single +4.75V to +11V supply or dual ±2.375V to ±5.5V supplies. It includes an uncommitted operational amplifier for anti-aliasing or clock-noise filtering. The component is housed in an 8-pin SO package and supports operation within a temperature range of 0°C to +70°C.

Feature Summary

• Provides maximally flat passband response characteristic of Butterworth filters
• Enables clock-tunable corner frequencies without external resistors or capacitors
• Integrates an uncommitted op amp for continuous-time filtering applications

Applications

• ADC Anti-Aliasing Filter
• Noise Analysis
• DAC Post-Filtering
• 50Hz/60Hz Line-Noise Filtering

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature rating. Confirm RoHS compliance status through manufacturer datasheets. Ensure compatibility with existing PCB footprints for the 8-pin SO configuration before procurement.

Selection Notes

Select this component when a fixed 8th-order Butterworth response is required. Verify that the application requires a maximum corner frequency of 25kHz. Ensure the design can accommodate the necessary clock signal generation circuitry. Consider the integrated op amp if additional filtering stages are needed.

Part Context

This part belongs to the MAX291/MAX292/MAX295/MAX296 family of easy-to-use, 8th-order, lowpass, switched-capacitor filters. The MAX291 specifically provides a Butterworth response, distinguishing it from the Bessel response of the MAX292. These devices are designed for minimal external component requirements.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.