MAX271CNG

Overview

The MAX271CNG is a digitally-programmed, dual second-order continuous-time lowpass filter housed in a 20-pin PDIP package. It operates within a supply voltage range of ±2.375V to ±8V and supports an operating temperature range of 0°C to +70°C. The device features two independent filter sections with programmable cutoff frequencies selectable from 1kHz to 25kHz via 7-bit digital inputs. It includes an integrated track-and-hold circuit and provides a typical dynamic range of 96dB.

Feature Summary

• Dual second-order continuous-time lowpass filters without clock noise
• Integrated track-and-hold circuit for signal sampling
• Digitally programmable cutoff frequencies from 1kHz to 25kHz
• Low-power shutdown mode reducing current consumption below 15µA

Applications

• Anti-aliasing filtering
• DAC output smoothing
• Track-and-hold applications
• Low-noise signal processing

Procurement Notes

Verify the component authenticity by checking the manufacturer markings against official documentation. Ensure the ordering suffix matches the required package type and temperature rating. Confirm RoHS compliance status if environmental regulations apply to the specific manufacturing batch.

Selection Notes

Select this component when continuous-time filtering is required to avoid switched-capacitor clock noise. The MAX271 variant is necessary if an internal track-and-hold function is needed. Verify that the required cutoff frequency falls within the 1kHz to 25kHz range and that the supply voltage accommodates the specified bipolar or single-supply configurations.

Part Context

The MAX271CNG belongs to the MAX270/MAX271 family of digitally-programmed filters. While the MAX270 includes an uncommitted operational amplifier, the MAX271 integrates a track-and-hold circuit instead. Both devices share identical filter characteristics and programming interfaces, differing primarily in the additional on-chip functionality provided by the MAX271.

Replacement Considerations

The MAX270CNG serves as a functional substitute if the track-and-hold feature is not required and an uncommitted op amp is preferred. Cross-referencing pin compatibility and electrical specifications is essential before substitution.