MAX270EWP+T

Overview

The MAX270EWP+T is a digitally-programmed, dual second-order continuous-time lowpass filter in a 20-pin Wide SO package. It operates within an extended temperature range of -40°C to +85°C and supports supply voltages from ±2.375V to ±8V. The device features two independently programmable filter sections with cutoff frequencies selectable between 1kHz and 25kHz via 7-bit digital codes. It provides a typical dynamic range of 96dB and includes a low-power shutdown mode that reduces current consumption to less than 15µA.

Feature Summary

• Dual independent second-order Sallen-Key lowpass filter sections
• Digitally programmable cutoff frequencies without external components
• Continuous-time architecture eliminates clock noise associated with switched-capacitor filters
• Low-power shutdown mode for significant quiescent current reduction

Applications

• Anti-aliasing filtering for analog-to-digital converters
• Output smoothing for digital-to-analog converters
• Cascading for higher-order filter responses
• Low-noise signal conditioning applications

Procurement Notes

Verify the ordering suffix '+T' indicates tape-and-reel packaging when sourcing this component. Confirm the 'E' designation matches the required -40°C to +85°C industrial temperature range. Ensure the 'W' package code corresponds to the 20-pin Wide Small Outline configuration. Cross-reference the RoHS compliance status indicated by the plus sign during procurement.

Selection Notes

Select the MAX270 variant if an uncommitted operational amplifier is required for additional circuit buffering or gain stages. Choose the MAX271 variant if an integrated track-and-hold function is necessary for sampling applications. Verify that the required cutoff frequency falls within the 1kHz to 25kHz range supported by the internal 7-bit programming interface.

Part Context

This component belongs to the MAX270/MAX271 family of continuous-time filters designed to replace traditional switched-capacitor solutions. It offers superior dynamic range by avoiding clock-induced aliasing. The E-grade version extends the operating temperature range compared to the C-grade commercial variant, making it suitable for broader environmental conditions.

Replacement Considerations

Public confirmed substitute part numbers: MAX270CPP, MAX270CWP, MAX270EPP, MAX271CNG, MAX271CWG, MAX271ENG, MAX271EWG.