MAX7418CUA+

Overview

The MAX7418CUA+ is a fifth-order, low-pass switched-capacitor filter (SCF) from the Analog Devices/MAXIM family. It operates on a single +5V supply and delivers an elliptic response with a transition ratio of 1.6. The device features a clock-to-corner frequency ratio of 100:1, allowing corner frequencies from 1Hz to 30kHz. Supply current is typically 3mA in operating mode and reduces to 0.2μA in shutdown mode. It includes an offset adjust pin for DC level control and supports both internal oscillator and external clocking options.

Feature Summary

• Elliptic filter response providing sharp rolloff and high stopband rejection
• Clock-tunable corner frequency via internal capacitor or external clock source
• Low-power operation with dedicated shutdown mode for minimal current draw
• Integrated offset adjustment capability for precise DC output level control

Applications

• ADC anti-aliasing filtering
• Post-DAC signal conditioning
• CT2 base station signal processing
• Speech processing systems

Procurement Notes

Verify the component marking against the official datasheet to confirm authenticity. Ensure the package matches the specified 8-pin μMAX form factor. Check for RoHS compliance indicators if required by your manufacturing standards. Confirm that the temperature range suffix aligns with your environmental specifications before finalizing procurement orders.

Selection Notes

Select this part when a steep elliptic rolloff is required for anti-aliasing applications. Ensure the system operates within the +5V single-supply constraint. Verify that the input signal amplitude remains within the optimal range to maintain low total harmonic distortion plus noise. Consider the internal oscillator capacitance requirements if no external clock is available.

Part Context

This component belongs to the MAX7418–MAX7425 series of fifth-order low-pass switched-capacitor filters. The MAX7418 specifically provides an elliptic response with a 1.6 transition ratio. Other variants in the series offer Bessel or Butterworth responses, or different transition ratios, catering to various phase linearity and passband flatness requirements.

Replacement Considerations

Direct replacements include other parts within the MAX7418–MAX7425 family sharing the same package and electrical characteristics. Verify compatibility regarding supply voltage, filter response type, and pin configuration before substitution.