MAX261BCNG+

Overview

The MAX261BCNG+ is a microprocessor-programmable universal active filter from Analog Devices/Maxim Integrated, housed in a 24-pin Plastic DIP package. It contains two second-order switched-capacitor filter sections with independent center frequency (f0) and Q control via a digital interface. The device supports bandpass, lowpass, highpass, notch, and allpass configurations without external components. Operating on single +5V or dual ±5V supplies, it handles center frequencies up to 57kHz with a maximum clock frequency of 1.5MHz. The B-grade variant guarantees a clock-to-f0 ratio error of ±2% over the commercial temperature range of 0°C to +70°C.

Feature Summary

• Microprocessor-controlled programming for precise filter function selection
• Independent digital control of center frequency and Q factor
• Supports multiple filter topologies including bandpass, lowpass, and highpass

Applications

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

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm the specific BCNG+ suffix indicates the B-grade accuracy and PDIP-24 packaging. Check current availability status as legacy components may have limited stock or end-of-life constraints. Ensure environmental compliance documentation matches project requirements.

Selection Notes

Select the MAX261BCNG+ when center frequencies up to 57kHz are required. Choose this model over the MAX260 if higher bandwidth is needed, or over the MAX262 if lower clock ratios are unnecessary. Verify that the B-grade accuracy meets system tolerance requirements. Ensure the design accommodates the necessary clock generation circuitry for the switched-capacitor operation.

Part Context

This component belongs to the MAX260/MAX261/MAX262 family of universal active filters. The MAX261 serves as the mid-range option between the MAX260's superior DC characteristics and the MAX262's extended frequency range. All devices share the same pinout and programming interface, allowing for flexible design scaling within the same product line.

Replacement Considerations

Direct replacements include other grades of the MAX261 such as the MAX261ACNG+ for tighter accuracy specifications. Cross-family alternatives like the MAX263 or MAX264 offer similar functionality but with different frequency ranges and pin-programmable interfaces rather than microprocessor control.