MAX270CWP+T

Overview

The MAX270CWP+T is a digitally-programmed, dual second-order continuous-time lowpass filter in a 20-pin Wide SOIC package. It operates on bipolar supplies of ±5V or single supplies from 4.75V to 16V. The device features two independent Sallen-Key filter sections with cutoff frequencies programmable from 1kHz to 25kHz via 7-bit digital codes (D0–D6). It provides a typical dynamic range of 96dB and wideband noise of 12µVrms at 1kHz. The unit includes a low-power shutdown mode drawing less than 15µA and supports microprocessor or pin-strap control interfaces.

Feature Summary

• Continuous-time filtering architecture eliminates clock noise associated with switched-capacitor designs
• Dual independently programmable second-order lowpass filter sections for cascaded higher-order responses
• Integrated uncommitted operational amplifier for additional signal conditioning flexibility

Applications

• Anti-aliasing filters for analog-to-digital converter front ends
• Output smoothing for digital-to-analog converters
• Low-noise signal processing chains requiring high dynamic range

Procurement Notes

Verify the specific suffix 'CWP' confirms the commercial temperature range and Wide SOIC packaging. Confirm RoHS compliance status through official manufacturer documentation. Ensure supply chain sources provide valid traceability for this component variant.

Selection Notes

Select the MAX270CWP+T when an internal uncommitted op amp is required for external circuit integration. Choose this model over the MAX271 if track-and-hold functionality is not needed. Verify that the 1kHz to 25kHz programmable frequency range meets system bandwidth requirements.

Part Context

This component belongs to the MAX270/MAX271 family of digitally programmed continuous-time filters. The MAX270 variant specifically integrates an uncommitted op amp, whereas the MAX271 includes a track-and-hold circuit. Both share identical filter core characteristics and programming interfaces.

Replacement Considerations

Direct functional replacements within the same family include the MAX271CWP+T, which offers identical filtering but adds track-and-hold capabilities. Other variants such as the MAX270EWP+T provide extended industrial temperature ranges.