MAX291ESA+

Overview

The MAX291ESA+ is an 8th-order, lowpass, switched-capacitor filter in the MAX291 series. It provides a Butterworth response with a corner frequency range of 0.1Hz to 25kHz. The device operates on a single +5V supply or dual ±5V supplies within a -40°C to +85°C temperature range. It utilizes an internal oscillator or external clock signal, maintaining a 100:1 clock-to-corner-frequency ratio. The component is housed in an 8-pin SO package and requires no external resistors or capacitors for basic operation.

Feature Summary

• Provides maximally flat passband response characteristic of Butterworth filters
• Enables corner frequency tuning via internal oscillator or external clock signals
• Includes an uncommitted operational amplifier for additional filtering stages

Applications

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

Procurement Notes

Verify the specific suffix 'ESA+' against official documentation to confirm the industrial temperature range (-40°C to +85°C) and RoHS compliance status. Ensure the ordering code matches the exact package type required for your PCB layout. Cross-reference the manufacturer's current datasheet revision to validate all electrical parameters before finalizing procurement specifications.

Selection Notes

Select this component when a fixed 8th-order lowpass response is required without external passive components. Choose the MAX291 variant specifically for its Butterworth characteristics over the Bessel response offered by other members of the family. Confirm that the application can accommodate the necessary clock frequency generation circuitry to control the filter's cutoff point effectively.

Part Context

This part belongs to the MAX291/MAX292/MAX295/MAX296 family of 8th-order, lowpass, switched-capacitor filters. While the MAX291 offers a Butterworth response, the MAX292 provides a Bessel response. The MAX295 and MAX296 variants extend the maximum corner frequency capability up to 50kHz compared to the 25kHz limit of the MAX291 and MAX292.

Replacement Considerations

MAX291CSA+