MAX274AENG+

Overview

The MAX274AENG+ is a fourth-order continuous-time active filter manufactured by Analog Devices Inc. under the Maxim Integrated brand. It operates on a single +5V supply with a cutoff frequency of 100kHz and features an external clock input ranging from 50 to 200 times the cutoff frequency. The device utilizes a low-pass Bessel response and is housed in a 28-pin narrow SOIC package. Designed for signal conditioning, it provides high linearity and stable performance across its specified operating temperature range.

Feature Summary

• Integrates four second-order sections into a single monolithic chip to realize a fourth-order low-pass Bessel filter response.
• Utilizes continuous-time architecture that eliminates the need for sample-and-hold circuits or anti-aliasing filters prior to analog-to-digital conversion.
• Features a programmable clock input that allows precise tuning of the filter's cutoff frequency through an external oscillator.

Applications

• Anti-aliasing filtering in data acquisition systems preceding analog-to-digital converters.
• Signal conditioning stages within power parameter measurement devices.
• General-purpose low-pass filtering in industrial instrumentation and control loops.

Procurement Notes

Verify the specific suffix 'A' against the official datasheet to confirm the commercial grade temperature rating and performance specifications. Confirm the 'EN' designation corresponds to the standard 28-pin narrow SOIC package dimensions. Ensure compatibility with the required single-supply voltage environment before finalizing procurement orders.

Selection Notes

Select this component when a fourth-order Bessel response is required for linear phase characteristics without discrete components. Compare the 100kHz cutoff requirement against the MAX275, which offers a 10kHz option. Verify that the system can provide the necessary external clock frequency, as the filter operation is strictly dependent on the ratio between the clock and the cutoff frequency.

Part Context

This part belongs to the MAX274/MAX275 family of continuous-time active filters. These integrated solutions replace complex discrete RC networks, significantly reducing board space and assembly costs. The family is designed specifically for applications requiring precise analog filtering directly before digital sampling stages.

Replacement Considerations

The MAX275 serves as a direct functional alternative within the same family, offering identical pinouts and architectures but featuring a lower 10kHz cutoff frequency instead of 100kHz. No other cross-model substitutes are documented in the primary reference material.