MAX261BENG

Overview

The MAX261BENG is a microprocessor-programmable universal active filter from the MAX260/MAX261/MAX262 series. It contains two second-order switched-capacitor sections with independent center frequency (f0) and Q control. The device supports bandpass, lowpass, highpass, notch, and allpass configurations without external components. It operates on single +5V or ±5V supplies. The B grade ensures a maximum fCLK/f0 ratio error of ±2%. The E suffix indicates an extended temperature range of -40°C to +85°C. It is housed in a 24-pin Plastic DIP package.

Feature Summary

• Microprocessor interface for precise digital control of filter parameters
• Independent programming of center frequency and Q factor
• Supports multiple filter topologies including bandpass, lowpass, and highpass
• Integrated oscillator options using crystal, RC network, or external clock

Applications

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

Procurement Notes

Verify the specific ordering suffix 'BENG' against the manufacturer's current datasheet to confirm availability and exact specifications. The 'B' grade denotes a 2% accuracy limit for the clock-to-center-frequency ratio. The 'E' suffix specifies operation within the extended commercial temperature range. Confirm package type and pinout compatibility before integration.

Selection Notes

Select the MAX261BENG when center frequencies up to 57kHz are required. Choose this part over the MAX260 if higher bandwidth is needed, or over the MAX262 if lower clock ratios are not necessary. Ensure the application requires microprocessor programmability rather than fixed pin-programming found in other Maxim filter families.

Part Context

This component belongs to the MAX260/MAX261/MAX262 family of CMOS dual second-order universal switched-capacitor active filters. These devices allow precise filter functions under microprocessor control. The MAX261 specifically handles center frequencies up to 57kHz, bridging the gap between the lower-frequency MAX260 and the higher-frequency MAX262.

Replacement Considerations

MAX260BENG offers similar functionality but with a lower center frequency range of 7.5kHz and superior DC offset specifications due to auto-zero circuitry. MAX262BENG provides an extended center frequency range up to 140kHz by employing lower clock-to-f0 ratios.