MAX7418CUA+T

Overview

The MAX7418CUA+T is a 5th-order, low-pass switched-capacitor filter (SCF) from the MAX7418–MAX7425 family. It operates on a single +5V supply and draws 3mA in active mode, reducing to 0.2μA in shutdown. The device features an elliptic response with a transition ratio of 1.6 and typically provides 53dB of stopband rejection. Corner frequencies are adjustable from 1Hz to 45kHz via a 100:1 clock-to-corner ratio using either an external capacitor for self-clocking or an external clock signal. It includes an offset adjust pin and offers low output offset of ±4mV.

Feature Summary

• Elliptic low-pass filter response with sharp rolloff characteristics
• Adjustable corner frequency range from 1Hz to 45kHz
• Low-power operation with dedicated shutdown mode
• Single-supply compatibility with offset adjustment capability

Applications

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

Procurement Notes

Verify the component matches the specific part number MAX7418CUA+T, ensuring the C suffix indicates the commercial temperature range and the UA suffix denotes the 8-pin μMAX package. Confirm the presence of the '+' symbol which signifies lead-free and RoHS compliance status as per manufacturer standards. Cross-reference the datasheet revision history to ensure the latest electrical characteristics are applied during design validation.

Selection Notes

Select this component when a steep roll-off elliptic response is required for single-supply applications. Ensure the system can provide a stable clock signal within the 100:1 ratio constraint relative to the desired corner frequency. Verify that the +5V supply voltage aligns with the device's operating range. Consider the thermal environment, as the 'C' variant is rated for 0°C to +70°C, while higher temperature requirements necessitate the 'E' variant.

Part Context

This component belongs to the MAX7418–MAX7425 series of 5th-order low-pass switched-capacitor filters manufactured by Analog Devices Inc./Maxim Integrated. The series differentiates models primarily by filter response type (elliptic, Bessel, Butterworth) and operating voltage (+5V vs +3V). The MAX7418 specifically represents the elliptic response variant designed for +5V operation, offering high stopband rejection suitable for precision analog signal conditioning tasks.

Replacement Considerations

Direct functional substitutes within the same family include MAX7418EUA for extended temperature ranges. For different response characteristics, consider MAX7419 (Bessel) or MAX7420 (Butterworth). No cross-family replacements are confirmed in public documentation.