MAX275BC/D

Overview

The MAX275BC/D is a fourth-order continuous-time active filter manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +5V supply or dual ±5V supplies, drawing only 1.5mA of current. The device features an external clock input ranging from 50 to 100 times the cutoff frequency, enabling precise tuning via a single resistor. It provides low-pass, high-pass, bandpass, and notch filtering responses with a cutoff frequency range of 10Hz to 100kHz. The IC includes two independent filters in a 16-pin DIP or SOIC package.

Feature Summary

• Continuous-time architecture eliminates switched-capacitor noise and clock feedthrough
• Single-resistor tuning allows easy adjustment of cutoff frequency
• Low power consumption suitable for battery-operated applications
• Multiple filter responses available through simple pin configuration

Applications

• Anti-aliasing filters in data acquisition systems
• Frequency selective circuits in communication receivers
• Instrumentation signal conditioning
• Audio processing and equalization

Procurement Notes

Verify the specific suffix BC/D against the official datasheet to confirm temperature range and package type. Confirm availability status as discontinued parts may require alternative sourcing strategies. Ensure compatibility with existing board layouts when substituting older revisions.

Selection Notes

Select this component when continuous-time performance is required over switched-capacitor alternatives. Verify that the external clock source can be provided within the specified frequency range relative to the desired cutoff. Check power supply constraints to ensure the single or dual supply option fits the system design.

Part Context

The MAX275 belongs to the MAX274/MAX275 family of continuous-time active filters. It serves as a direct alternative to switched-capacitor filters like the MAX291 where noise performance is critical. The device integrates passive components internally, reducing external component count compared to discrete RC solutions.

Replacement Considerations

MAX274BC/D offers identical functionality but with different internal filter configurations. MAX270/MAX271 provide digital programmability instead of analog tuning. Evaluate these options based on control interface requirements and tuning flexibility needs.