MAX294EWE+

Overview

The MAX294EWE+ is an active filter integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It implements an 8th-order, lowpass, elliptic response using switched-capacitor technology. The device operates with a cutoff frequency of 25 kHz and is housed in a 16-SOIC package. It supports a supply voltage range from 3 V to 5.5 V and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Implements an 8th-order elliptic lowpass filter response utilizing switched-capacitor architecture for precise signal filtering.
• Features a fixed cutoff frequency of 25 kHz suitable for standard communication and data acquisition applications.

Applications

• Data acquisition systems requiring high-selectivity analog front-end filtering
• Communication equipment needing band-limiting and noise reduction
• Industrial control systems with precision signal conditioning requirements

Procurement Notes

Verify the specific suffix 'EWE+' against the official datasheet to confirm the wide SOIC-16 package and industrial temperature grade. Ensure the design accommodates the switched-capacitor nature of the component, which requires a clock signal input distinct from the power supply. Confirm that the 25 kHz cutoff aligns with system bandwidth needs before procurement.

Selection Notes

Select this component when an 8th-order elliptic response is required without discrete passive components. The switched-capacitor design eliminates the need for external capacitors and resistors, saving board space. Verify that the application can provide the necessary clock frequency, as the filter performance is directly dependent on the external clock source relative to the cutoff frequency.

Part Context

The MAX294 belongs to a family of monolithic switched-capacitor filters from Maxim Integrated. These devices integrate complex filter functions onto a single CMOS chip, replacing traditional RC networks. The EWE+ designation indicates a lead-free, RoHS-compliant variant in a wide SOIC package, suitable for automated surface-mount assembly.

Replacement Considerations

Direct replacements include other 8th-order switched-capacitor filters from the same manufacturer series, such as the MAX274 or MAX275, provided they match the required cutoff frequency and package dimensions. Cross-vendor substitutes require careful verification of pinout compatibility and clock interface requirements.