MAX261ACNG

Overview

The MAX261ACNG is a CMOS dual second-order universal switched-capacitor active filter in a 24-pin Plastic DIP package. It supports center frequencies up to 57kHz with a supply voltage range of ±2.37V to ±6.3V. The device features independent programming for center frequency and Q factor via a microprocessor interface, utilizing a 6-bit f0 program input and 7-bit Q control. It operates within a commercial temperature range of 0°C to +70°C and provides bandpass, lowpass, highpass, notch, and allpass configurations without external components.

Feature Summary

• Microprocessor programmable interface for precise control of filter functions
• Dual second-order sections allowing independent configuration
• 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 the specific ordering suffix ACNG confirms the commercial temperature range and plastic DIP package. Confirm RoHS compliance status as older Maxim Integrated parts may vary. Check current availability as this component series has been subject to discontinuation notices by Analog Devices.

Selection Notes

Select the MAX261ACNG 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-to-frequency ratios are not necessary. Ensure the application requires a microprocessor interface for dynamic tuning rather than fixed pin-programmable alternatives.

Part Context

This component belongs to the MAX260/MAX261/MAX262 family of microprocessor programmable universal active filters. The MAX261 variant specifically bridges the gap between the DC-optimized MAX260 and the high-frequency MAX262, offering a 57kHz center frequency limit while maintaining standard switched-capacitor architecture.

Replacement Considerations

Public confirmed substitutes include MAX260ACNG and MAX262ACNG from the same family. Verify compatibility regarding center frequency limits and offset specifications before substitution.