MAX294CSA

Overview

The MAX294CSA is an active switched-capacitor filter integrated circuit manufactured by Analog Devices Inc. under the Maxim Integrated brand. It implements an elliptic low-pass filter response with a cutoff frequency of 25 kHz and features eight poles for high selectivity. The device operates on a single power supply, simplifying system design by eliminating the need for dual voltage rails. It utilizes external clocking to set the filter characteristics, allowing for precise frequency control relative to the input clock signal. The component is housed in a standard 8-pin SOIC surface-mount package, suitable for compact electronic applications requiring analog signal conditioning.

Feature Summary

• Elliptic low-pass filter response providing sharp roll-off characteristics
• Switched-capacitor architecture enabling precise frequency definition via external clock
• Single-supply operation capability for simplified power management
• Eight-pole configuration for enhanced signal filtering performance

Applications

• Anti-aliasing filters in data acquisition systems
• Signal conditioning for sensor interfaces
• Audio processing circuits requiring specific frequency band rejection
• Instrumentation systems needing precise analog filtering

Procurement Notes

Verify the exact suffix of the part number when ordering, as variations such as MAX294CSA+ indicate RoHS compliance while others may not. Confirm availability status directly with authorized distributors, as this component may be subject to limited stock or end-of-life constraints. Ensure that the supplier provides valid traceability documentation matching the manufacturer's specifications to avoid counterfeit components.

Selection Notes

Select the MAX294CSA when an elliptic filter response is required for maximum stopband attenuation within a switched-capacitor topology. Consider the dependency on an external clock source for frequency accuracy and stability. Evaluate the single-supply operation against system power requirements. Compare against other filter orders if different roll-off characteristics are needed, ensuring the 25 kHz cutoff aligns with the application's signal bandwidth.

Part Context

This component belongs to the MAX29x series of active switched-capacitor filters from Maxim Integrated. These devices are designed to replace traditional passive RC filters, offering tunable frequencies and higher precision without bulky inductors. The series typically includes various filter responses like Butterworth and Chebyshev, but the MAX294 specifically provides elliptic characteristics for superior selectivity in analog signal processing tasks.

Replacement Considerations

Public confirmed substitute part numbers: MAX294CSA+