MAX261BENG+

Overview

The MAX261BENG+ is a microprocessor-programmable universal active filter featuring two second-order switched-capacitor sections in a 24-pin Plastic DIP package. It supports center frequencies up to 57kHz with ±5V supplies (±2.37V to ±6.3V range) and operates within a -40°C to +85°C temperature range. The device utilizes a 6-bit f0 program input for 64-step frequency control and independent Q programming. Key electrical characteristics include a typical power supply current of 16mA, a gain bandwidth product of 2.5MHz, and a slew rate of 6V/µs.

Feature Summary

• Microprocessor interface allows independent programming of center frequency and Q factor for each filter section.
• Supports multiple filter configurations including bandpass, lowpass, highpass, notch, and allpass without external components.
• Includes an uncommitted operational amplifier available on specific pins for additional signal processing.

Applications

• Microprocessor-tuned filters
• Anti-aliasing filters
• Digital signal processing systems
• Adaptive filters
• Phase-locked loops

Procurement Notes

Verify the component status as this part number may be discontinued or subject to limited availability. Confirm that the 'E' suffix denotes the extended industrial temperature range (-40°C to +85°C) and the 'NG' indicates the 24-pin plastic DIP package. Ensure compatibility with existing PCB footprints and voltage levels before procurement.

Selection Notes

Select the MAX261BENG+ when center frequencies up to 57kHz are required, distinguishing it from the MAX260 (7.5kHz limit) and MAX262 (140kHz limit). The 'B' grade offers 2% accuracy compared to the 1% accuracy of the 'A' grade. Ensure the application can accommodate the switched-capacitor clock noise if strict wideband noise performance is critical.

Part Context

This component belongs to the MAX260/MAX261/MAX262 family of CMOS dual second-order universal switched-capacitor active filters. The MAX261 variant specifically bridges the gap between the lower-frequency MAX260 and the higher-frequency MAX262, offering a center frequency range extending to 57kHz while maintaining microprocessor programmability.

Replacement Considerations

Direct replacements include the MAX261ACNG+ (1% accuracy, commercial temp), MAX261BCNG+ (2% accuracy, commercial temp), and MAX261AENG+ (1% accuracy, extended temp). For higher frequency needs, consider the MAX262 series; for better DC offset, consider the MAX260 series.