MAX7408CUA+

Overview

The MAX7408CUA+ 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 from 1Hz to 15kHz. The device provides 53dB stopband rejection with a transition ratio of 1.6 and draws 1.2mA in operating mode. A shutdown mode reduces current to 0.2µA. It includes an offset-adjust pin for DC level control and supports both internal oscillator (via external capacitor) and external clocking. The component is housed in an 8-pin µMAX package.

Feature Summary

• Fifth-order elliptic lowpass filtering with sharp rolloff characteristics
• Clock-tunable corner frequency ranging from 1Hz to 15kHz
• Low-power operation with dedicated shutdown mode
• Single-supply compatibility with offset adjustment capability

Applications

• ADC anti-aliasing
• Post-DAC filtering
• Speech processing

Procurement Notes

Verify the specific suffix 'CUA+' against the manufacturer's official documentation to confirm the commercial temperature range and lead-free status. Ensure the ordering code matches the required package style and voltage specifications before finalizing procurement. Cross-reference the part number with authorized distributors to confirm availability and authenticity.

Selection Notes

Select this component for applications requiring steep roll-off in single-supply systems. The MAX7408 variant is suitable for +5V designs needing 53dB stopband rejection. Consider the MAX7411 if a sharper transition ratio is preferred. Ensure the system clock or internal oscillator capacitor allows for the desired corner frequency within the specified input signal amplitude range.

Part Context

The MAX7408CUA+ belongs to the MAX7408/MAX7411/MAX7412/MAX7415 family of fifth-order elliptic switched-capacitor filters. These devices utilize a passive ladder emulation approach to minimize component sensitivity compared to cascaded biquadratic designs. The family offers options for different supply voltages and transition ratios to suit various analog signal processing requirements.

Replacement Considerations

The MAX7411CUA+ offers a steeper transition ratio of 1.25 but lower stopband rejection. The MAX7412SCUA+ operates on a +3V supply. Verify pin compatibility and electrical characteristics when substituting within the MAX74xx family.