MAX7426EUA+

Overview

The MAX7426EUA+ is a fifth-order, lowpass, elliptic switched-capacitor filter operating from a single +5V supply. It features a clock-to-corner frequency ratio of 100:1, enabling corner frequencies between 0.001kHz and 9kHz. The device delivers -81dB typical total harmonic distortion plus noise and approximately 37dB stopband rejection with a transition ratio of 1.25. Supply current is 0.8mA in operating mode and reduces to 0.2µA in shutdown mode. It operates within a temperature range of -40°C to +85°C and is housed in an 8-pin µMAX package.

Feature Summary

• Fifth-order elliptic lowpass response providing sharp rolloff and high stopband rejection
• Clock-tunable corner frequency allowing precise control via internal or external clock sources
• Low-power operation with dedicated shutdown mode for significant current reduction
• Offset-adjust pin capability for DC output level tuning

Applications

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

Procurement Notes

Verify the specific suffix 'EUA+' against official Analog Devices documentation to confirm the extended temperature range (-40°C to +85°C) and 8-pin µMAX packaging. Ensure compatibility with single +5V supply requirements and check for any recent lifecycle status changes such as obsolescence or recommended new designs.

Selection Notes

Select this component when a fixed elliptic response with steep rolloff is required for single-supply applications. It is suitable for designs needing low power consumption and adjustable corner frequencies. Consider the MAX7427 if a +3V supply is preferred instead of the +5V required by the MAX7426.

Part Context

The MAX7426EUA+ belongs to the MAX7426/MAX7427 family of switched-capacitor filters. These devices utilize a passive ladder emulation technique using switched-capacitor integrators, offering lower component sensitivity compared to cascaded biquadratic designs. The family provides a fixed transition ratio of 1.25, simplifying design tasks to clock frequency selection.

Replacement Considerations

The MAX7427EUA+ serves as a functional substitute for designs requiring a +3V supply instead of +5V. Other Maxim integrated filters like the MAX291 or MAX292 may be considered for different filter types or dual-supply configurations, though they differ in architecture.