MAX271CNG+

Overview

The MAX271CNG+ is a digitally-programmed, dual second-order continuous-time lowpass filter housed in a 20-pin PDIP package. It operates on supply voltages ranging from ±2.375V to ±8V (4.75V to 16V single-supply). The device features two independent filter sections with programmable cutoff frequencies selectable between 1kHz and 25kHz via 7-bit digital inputs. It provides a typical dynamic range of 96dB and includes an integrated track-and-hold circuit. The component supports both microprocessor control and pin-strap programming modes.

Feature Summary

• Dual second-order continuous-time lowpass filters without clock noise
• Integrated track-and-hold circuit for signal sampling
• Independent or simultaneous frequency programming capabilities
• Low-power shutdown mode reducing quiescent current significantly

Applications

• Anti-aliasing filtering for data acquisition systems
• Output smoothing for digital-to-analog converters
• Low-noise signal conditioning circuits
• Track-and-hold applications preceding analog-to-digital conversion

Procurement Notes

Verify the specific ordering suffix against official Analog Devices documentation to confirm package type and temperature range. Ensure compatibility with system voltage requirements and interface logic levels before integration. Confirm RoHS compliance status through manufacturer datasheets.

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 1kHz to 25kHz cutoff range meets application bandwidth requirements and that the 20-pin PDIP package fits the design constraints.

Part Context

This part belongs to the MAX270/MAX271 family of digitally-programmable filters. The MAX271 distinguishes itself from the MAX270 by including an on-chip track-and-hold amplifier. Both devices share identical filter characteristics and packaging options, differing primarily in the presence of the T/H circuitry within the MAX271 architecture.

Replacement Considerations

The MAX270CNG+ serves as a functional substitute if the track-and-hold feature is not required. Other members of the MAX27x family may be considered based on specific temperature grades or package variations.