MAX7427CUA+T

Overview

The MAX7427CUA+T is a fifth-order, lowpass, elliptic switched-capacitor filter designed for single +3V supply operation. It delivers sharp rolloff with a transition ratio of 1.25 and typically 37dB stopband rejection. The device operates from a clock frequency range that allows corner frequencies between 1Hz and 12kHz. Supply current is 0.8mA in operating mode and reduces to 0.2µA in shutdown mode. Total harmonic distortion plus noise is -79dB. The component features an internal oscillator controlled by an external capacitor or accepts an external clock signal.

Feature Summary

• Fifth-order elliptic lowpass filter architecture providing steep attenuation characteristics
• Clock-tunable corner frequency adjustable from 1Hz to 12kHz via internal or external clocking
• Low-power operation with dedicated shutdown mode reducing current consumption significantly
• Single-supply compatibility optimized for +3V systems with low output offset voltage

Applications

• ADC anti-aliasing filtering
• Post-DAC smoothing applications
• Speech processing circuits
• CT2 base station signal conditioning

Procurement Notes

Verify the specific suffix 'CUA' corresponds to the commercial temperature range (0°C to +70°C) and the 8-pin µMAX package configuration. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the ordering code matches the exact electrical specifications required for the target application environment.

Selection Notes

Select this component when a +3V single-supply system requires high-selectivity filtering without complex external components. The fixed elliptic response simplifies design compared to programmable filters. Consider the MAX7426 if the system utilizes a +5V supply instead. Evaluate the need for external clocking versus internal oscillator capacitance based on required frequency stability.

Part Context

This part belongs to the MAX7426/MAX7427 family of switched-capacitor filters manufactured by Analog Devices/Maxim Integrated. The MAX7427 variant is specifically engineered for lower voltage operation at +3V, whereas the MAX7426 supports +5V supplies. Both share identical filter topology and pin configurations, differing primarily in power requirements.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided datasheet.