MAX295CWE+

Overview

The MAX295CWE+ is an 8th-order, lowpass, switched-capacitor filter from 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 or dual ±5V supplies and features an internal oscillator or external clock input. A clock-to-corner-frequency ratio of 50:1 is maintained. An uncommitted operational amplifier is included for post-filtering or anti-aliasing tasks. The component is housed in an 8-pin SO package.

Feature Summary

• Provides maximally flat passband response characteristic of Butterworth filters
• Operates using either an internal oscillator controlled by an external capacitor or an external clock signal
• Includes an uncommitted operational amplifier for additional continuous-time filtering stages

Applications

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

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature range. Confirm RoHS compliance status as indicated by the '+' suffix. Check current availability through authorized distributors, as stock levels fluctuate. Ensure the selected variant matches the required operating temperature specifications for the target application environment.

Selection Notes

Select the MAX295CWE+ when a Butterworth response is required for applications needing a maximally flat passband. Choose this model over the MAX292 if faster settling time is not the primary design constraint. Verify that the required corner frequency falls within the 0.1Hz to 50kHz range supported by the 50:1 clock ratio. Ensure the system can provide the necessary clock frequency or accommodate the internal oscillator capacitor requirements.

Part Context

The MAX295CWE+ belongs to the MAX291/MAX292/MAX295/MAX296 family of 8th-order lowpass switched-capacitor filters. While the MAX291 and MAX295 share the Butterworth response, the MAX295 specifically supports higher corner frequencies up to 50kHz compared to the 25kHz limit of the MAX291. This family allows for easy setup with minimal external components.

Replacement Considerations

The MAX291CWE+ offers a similar Butterworth response but is limited to a maximum corner frequency of 25kHz. The MAX296CWE+ provides a Bessel response instead of Butterworth. Verify pin compatibility and electrical characteristics before substituting any member of the MAX291 series.