MAX260BCNG+

Overview

The MAX260BCNG+ 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 sections with independent center frequency (f0) and Q control via a parallel interface. The device operates on single +5V or dual ±5V supplies within a commercial temperature range of 0°C to +70°C. It supports bandpass, lowpass, highpass, notch, and allpass configurations without external components. The B-grade variant guarantees a clock-to-f0 ratio error of ±2% and features a typical power supply current of 15mA at ±5V.

Feature Summary

• Microprocessor-controlled programming for precise filter function selection
• Independent digital control over center frequency and quality factor
• Supports multiple filter topologies including bandpass, lowpass, and highpass
• Integrated oscillator options using crystal, RC network, or external clock

Applications

• Microprocessor-tuned filter systems
• Anti-aliasing filters in data acquisition chains
• Digital signal processing front-ends
• Adaptive filtering applications
• Phase-locked loop circuits

Procurement Notes

Verify the specific suffix BCNG against the target design requirements to ensure the correct accuracy grade and package type are selected. Confirm that the commercial temperature range meets the operational environment standards. Check for updated availability status as legacy components may have restricted supply channels. Ensure the ordering documentation matches the exact part number to avoid substitution errors during procurement.

Selection Notes

Select this component when microprocessor programmability is required for dynamic filter tuning. Compare the MAX260's lower bandwidth capabilities against the MAX261 and MAX262 if higher center frequencies are needed. Verify that the available clock frequencies align with the desired f0 range and Q accuracy specifications. Consider the internal auto-zero circuitry benefits for DC offset performance compared to other variants in the series.

Part Context

This component belongs to the MAX260/MAX261/MAX262 family of CMOS dual second-order universal switched-capacitor active filters. The MAX260 specifically offers superior DC offset and low-frequency performance due to its auto-zero architecture, distinguishing it from the MAX261 and MAX262 which support higher center frequencies. All devices share the same pinout and programming interface, allowing for flexible design scaling across different frequency bands.

Replacement Considerations

Direct functional substitutes include the MAX261BCNG+ and MAX262BCNG+ from the same manufacturer, provided the higher frequency ranges of those devices do not introduce unwanted noise or aliasing issues. Verify that the replacement maintains the same PDIP-24 package and voltage specifications.