MAX7427EUA+T

Overview

The MAX7427EUA+T is a fifth-order, lowpass, elliptic switched-capacitor filter designed for single-supply +3V operation. It provides a sharp rolloff with a transition ratio of 1.25 and typically 37dB of stopband rejection. The corner frequency is clock-tunable from 1Hz to 12kHz using either an external capacitor or an external clock signal. Operating supply current is 0.8mA, reducing to 0.2µA in shutdown mode. The device features a low output offset voltage of ±4mV and total harmonic distortion plus noise of -79dB. It is housed in an 8-pin µMAX package.

Feature Summary

• Fifth-order elliptic lowpass response with steep rolloff
• Clock-tunable corner frequency from 1Hz to 12kHz
• Low-power operation with dedicated shutdown mode
• Single-supply +3V design optimized for portable systems

Applications

• ADC anti-aliasing
• Post-DAC filtering
• Speech processing
• CT2 base stations

Procurement Notes

Verify the component matches the specific +3V operating voltage requirement, as the family includes a +5V variant. Confirm the 'E' suffix indicates the extended temperature range of -40°C to +85°C. Ensure the ordering code includes the '+T' designation for reel packaging if required by assembly equipment. Cross-reference the manufacturer's latest documentation for any potential lifecycle changes.

Selection Notes

Select this model specifically for applications requiring a +3V supply rail, distinguishing it from the MAX7426 which requires +5V. Consider the internal oscillator option if minimizing external components is a priority, noting that accuracy depends on the external timing capacitor. Evaluate the need for shutdown functionality to meet strict power budget constraints in battery-operated devices.

Part Context

This component belongs to the MAX7426/MAX7427 family of switched-capacitor filters manufactured by Analog Devices / Maxim Integrated. The family shares identical architectural characteristics and pinouts, differentiated primarily by their nominal operating supply voltages. The MAX7427 variant is engineered for lower voltage environments compared to its +5V counterpart.

Replacement Considerations

The MAX7426 serves as a functional substitute within the same package but requires a +5V supply instead of +3V. Other members of the MAX742x series may offer different filter responses or order configurations but require verification of electrical compatibility.