MAX295ESA+

Overview

The MAX295ESA+ 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 50kHz. The device operates on a single +5V supply (4.75V to 11V) or dual ±5V supplies (±2.375V to ±5.5V). It features a clock-to-corner-frequency ratio of 50:1 and includes an uncommitted operational amplifier for post-filtering or anti-aliasing. The component is housed in an 8-pin SO package and supports operation from -40°C to +85°C.

Feature Summary

• Provides maximally flat passband response characteristic of Butterworth filters
• Clock-tunable corner frequency adjustable between 0.1Hz and 50kHz
• Includes an internal oscillator or accepts external clock signals
• Integrates 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 that the specific part number matches the required temperature grade (-40°C to +85°C) and package type (SOIC-8). Confirm RoHS compliance status through official manufacturer documentation. Ensure the design accommodates the specified power supply requirements and clock signal constraints before procurement.

Selection Notes

Select this component when a fixed 8th-order Butterworth response is required. Choose based on the maximum desired corner frequency of 50kHz. Verify compatibility with available clock sources, as the filter performance depends directly on the clock-to-corner frequency ratio. Consider the integrated op amp if additional continuous-time filtering is needed.

Part Context

The MAX295ESA+ belongs to the MAX291 family of easy-to-use switched-capacitor filters. This series distinguishes itself by requiring minimal external components while delivering high-performance filtering. The MAX295 specifically offers a wider bandwidth capability compared to the MAX291, supporting corner frequencies up to 50kHz.

Replacement Considerations

The MAX291 serves as a functional substitute within the same family but is limited to a 25kHz maximum corner frequency. The MAX296 provides a Bessel response instead of Butterworth. Cross-referencing datasheets is necessary to ensure response characteristics match the application requirements.