MAX297ESA+

Overview

The MAX297ESA+ is an active, low-pass, switched-capacitor filter manufactured by Analog Devices Inc. under the Maxim Integrated brand. It implements a 5th-order Bessel-Thomson response within a single channel. The device operates with a clock frequency of 50 kHz and features a cutoff frequency of 1 kHz. It requires a single power supply voltage ranging from 4.75 V to 5.25 V. The component is housed in an 8-pin SOIC package and supports surface-mount installation. It functions across an industrial temperature range from -40°C to +85°C.

Feature Summary

• Provides a maximally flat group delay characteristic inherent to the Bessel-Thomson transfer function.
• Utilizes switched-capacitor architecture for precise frequency control determined by an external clock input.
• Integrates all necessary filter components into a single-channel monolithic IC.

Applications

• Signal conditioning circuits requiring linear phase response
• Anti-aliasing filters in data acquisition systems
• Precision instrumentation front-ends

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm package type and temperature grade. Confirm RoHS compliance status directly with the supplier or official documentation before procurement. Check for any recent product lifecycle changes such as obsolescence notices or alternative part recommendations.

Selection Notes

Select this component when a Bessel-Thomson response is required for minimal signal distortion. Ensure the application can provide a stable 50 kHz clock signal, as filter performance depends on it. Verify that the 1 kHz cutoff frequency aligns with the system bandwidth requirements and that the 5V supply voltage matches the design constraints.

Part Context

This component belongs to the MAX295-MAX298 family of active switched-capacitor filters. These devices are designed to replace traditional passive LC filters in applications where size and precision are critical. The MAX297 specifically offers a 5th-order Bessel response, distinguishing it from other members of the series that may offer Butterworth or Chebyshev characteristics.

Replacement Considerations

Check the official datasheet for direct pin-compatible alternatives within the MAX295-MAX298 series. Verify if updated revisions of the component exist with improved specifications or packaging options. Consult manufacturer guidelines for any recommended cross-references if the original part is discontinued.