MAX7425CUA+

Overview

The MAX7425CUA+ is a fifth-order, low-pass, elliptic switched-capacitor filter (SCF) from Analog Devices. It operates on a single +3V supply with a typical current draw of 3mA and supports corner frequencies from 1Hz to 45kHz. The device features a sharp rolloff with a 1.25 transition ratio and provides 37dB of stopband rejection. It includes a shutdown mode reducing current to 0.2μA, an offset adjust pin, and dual clocking options. Packaged in an 8-pin μMAX, it functions within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Elliptic response with a 1.25 transition ratio for steep rolloff
• Clock-tunable corner frequency adjustable from 1Hz to 45kHz
• Low-power operation with a dedicated shutdown mode
• Single-supply compatibility with internal or external clocking

Applications

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

Procurement Notes

Verify the component matches the exact part number MAX7425CUA+. Confirm the suffix indicates standard RoHS compliance as per manufacturer documentation. Ensure the package type corresponds to the 8-pin μMAX configuration. Validate that the operating temperature range aligns with commercial specifications. Cross-reference the datasheet revision to ensure accurate electrical characteristics.

Selection Notes

Select this component when a sharp elliptic rolloff is required for signal conditioning. The 1.25 transition ratio distinguishes it from other variants in the series. Verify the system operates at +3V, as higher voltage variants are available. Consider the external clock requirement for precise frequency control. Evaluate the need for shutdown functionality to manage power consumption effectively.

Part Context

This device belongs to the MAX7418–MAX7425 family of fifth-order low-pass switched-capacitor filters. It shares the same physical package and basic architecture with other members but differs in its specific filter response and operating voltage. The MAX7425 specifically targets applications requiring elliptic characteristics at lower supply voltages compared to the MAX7421.

Replacement Considerations

The MAX7421 serves as a functional substitute if the system supports a +5V supply. Both devices share the same elliptic response and 1.25 transition ratio. Verify that the voltage tolerance and power supply constraints allow for the replacement without circuit modification.