MAX261BCNG

Overview

The MAX261BCNG is a microprocessor-programmable universal active filter from the Maxim Integrated MAX260/MAX261/MAX262 family. It contains two independent second-order switched-capacitor filter sections housed in a 24-pin plastic DIP package. The device supports center frequencies up to 57kHz and operates with single +5V or dual ±5V supplies. It features 6-bit f0 programming for 64-step center frequency control and 7-bit Q programming for 128-step quality factor adjustment. The BCNG suffix indicates commercial temperature range (0°C to +70°C) with 2% accuracy.

Feature Summary

• Microprocessor interface allows independent digital control of center frequency, Q, and operating mode for each filter section
• Universal configuration capability supporting bandpass, lowpass, highpass, notch, and allpass responses without external components
• Integrated oscillator options support crystal, RC network, or external clock generator inputs

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm the package type, temperature range, and accuracy grade. Ensure the component meets RoHS compliance requirements if applicable to your project specifications.

Selection Notes

Select this part when center frequencies up to 57kHz are required. Choose the MAX260 for superior DC offset performance or the MAX262 for higher frequency ranges up to 140kHz. Verify that the required filter modes align with the device's internal state-variable topology.

Part Context

This component belongs to the MAX260/MAX261/MAX262 series of CMOS dual second-order universal switched-capacitor active filters. These devices share a common architecture but differ in their maximum center frequency capabilities and DC characteristics.

Replacement Considerations

Direct functional substitutes within the same package include the MAX260BCNG and MAX262BCNG. Note that the MAX260 offers better DC specs while the MAX262 supports higher frequencies.