MAX268BENG

Overview

The MAX268BENG is a pin-programmable universal active filter housed in a 24-pin plastic dual in-line package (PDIP). It contains two second-order switched-capacitor filter sections capable of realizing bandpass, lowpass, highpass, notch, and allpass responses. The device operates with a supply voltage range of 4.74V to 12.6V or ±2.37V to ±6.3V, typically using a 5V single supply. It supports center frequencies up to 140 kHz by employing lower clock-to-f0 ratios compared to other devices in the family.

Feature Summary

• Pin-programmable configuration allows selection of filter type without external components
• Dual second-order switched-capacitor sections enable independent control of Q and center frequency
• Supports multiple filter functions including bandpass, lowpass, highpass, notch, and allpass

Applications

• Signal processing requiring precise analog filtering
• Instrumentation systems needing programmable frequency response
• Communication circuits utilizing switched-capacitor techniques

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm RoHS compliance status as indicated in official documentation. Check for end-of-life notifications regarding discontinuance. Ensure the PDIP-24 package matches design requirements before procurement.

Selection Notes

Select this part when a maximum center frequency of 140 kHz is required. Compare against MAX263 and MAX264 if lower frequency ranges are sufficient. Verify that the 24-pin DIP package fits the PCB layout constraints. Ensure the application can provide the necessary clock signal for switched-capacitor operation.

Part Context

The MAX268 belongs to the MAX263/MAX264/MAX267/MAX268 family of microprocessor-programmable universal active filters. It extends the center frequency range to 140 kHz, whereas the MAX261 handles up to 57 kHz and the MAX260 up to 7.5 kHz. All devices share similar pinouts and functionality but differ in frequency capabilities.

Replacement Considerations

Publicly confirmed substitutes include MAX263BCWG+, MAX264BCWG+, and MAX267BCWG+. These parts offer similar functionality but may have different cutoff frequencies or package options. Verify electrical specifications and pin compatibility before substitution.