MAX295CSA+

Overview

The MAX295CSA+ is an 8th-order, lowpass, switched-capacitor filter in the MAX291 series. It provides a Butterworth response with a maximally flat passband. The corner frequency is tunable from 0.1Hz to 50kHz using a clock-to-corner-frequency ratio of 50:1. It operates on a single +5V supply or dual ±5V supplies and requires no external resistors or capacitors for the filter core. An uncommitted operational amplifier is included for post-filtering or anti-aliasing tasks.

Feature Summary

• Provides an 8th-order lowpass Butterworth response for maximally flat passband performance
• Clock-tunable corner frequency range from 0.1Hz to 50kHz with a 50:1 clock ratio
• Operates with either a single +5V supply or dual ±5V supplies without requiring external resistors or capacitors
• Includes an uncommitted operational amplifier for continuous-time filtering applications

Applications

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

Procurement Notes

Verify the component against official manufacturer documentation to confirm authenticity and specifications. Ensure the ordering suffix matches the required temperature range and package type. Cross-reference part numbers with authorized distributors to validate availability and compliance with current manufacturing standards.

Selection Notes

Select the MAX295CSA+ when a Butterworth response is required for signal conditioning. Choose this model over the MAX291 if the application demands a higher maximum corner frequency up to 50kHz. Verify that the system clock can be synchronized with DACs to prevent beat frequencies from aliasing into the passband.

Part Context

The MAX295CSA+ belongs to the MAX291 family of 8th-order lowpass switched-capacitor filters. This series includes the MAX291, MAX292, MAX295, and MAX296. The MAX295 specifically offers a Butterworth response with a 50:1 clock-to-corner-frequency ratio, distinguishing it from the MAX291 which has a 100:1 ratio and a lower maximum corner frequency.

Replacement Considerations

The MAX291 serves as a functional substitute within the same family but features a different clock-to-corner-frequency ratio (100:1) and a lower maximum corner frequency (25kHz). Designers must adjust the external clock frequency accordingly when substituting between these models.