MAX281BCWE+

Overview

The MAX281BCWE+ is a fifth-order zero-error Bessel low-pass switch-capacitor filter manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 4.5 V to 36 V for single supplies or ±4.5 V to ±20 V for dual supplies. The device features a fixed cutoff frequency of 20 kHz and utilizes an internal clock oscillator running at 1 MHz. It is housed in a 16-pin SOIC-Wide package with a specified operating temperature range from 0°C to +70°C.

Feature Summary

• Provides a fifth-order Bessel response characterized by linear phase shift and minimal overshoot.
• Eliminates the need for external timing components through an integrated 1 MHz clock oscillator.
• Maintains signal integrity without gain peaking across the passband.

Applications

• Anti-aliasing filtering in data acquisition systems
• Signal conditioning for analog-to-digital converters
• Low-noise sensor interface circuits

Part Context

This component belongs to the MAX281 family of active filters, which are designed as drop-in replacements for discrete RC networks. The 'C' suffix indicates the commercial temperature grade (0°C to +70°C), while the 'W' denotes the wide SOIC package. These devices integrate precision switched-capacitor technology to achieve stable filter characteristics independent of external resistor and capacitor tolerances.

Replacement Considerations

Verify that the replacement supports the required 20 kHz cutoff frequency and Bessel topology. Ensure the new component accommodates the system's supply voltage range and physical footprint constraints associated with the 16-pin SOIC-Wide package.