MAX7408CUA+T

Overview

The MAX7408CUA+T is a fifth-order, lowpass, elliptic switched-capacitor filter designed for single-supply operation at +5V. It features a clock-to-corner frequency ratio of 100:1, allowing corner frequencies from 1Hz to 15kHz. The device provides 53dB of stopband rejection with a transition ratio of 1.6 and achieves -80dB THD plus noise. Supply current is 1.2mA in operating mode and reduces to 0.2µA in shutdown mode. It includes an offset-adjust pin and operates within a temperature range of 0°C to +70°C.

Feature Summary

• Fifth-order elliptic lowpass filtering with sharp rolloff characteristics
• Clock-tunable corner frequency ranging from 1Hz to 15kHz
• Low power consumption with dedicated shutdown mode
• Single-supply operation optimized for +5V systems

Applications

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

Procurement Notes

Verify the component authenticity by checking the manufacturer marking against the official datasheet specifications. Confirm the package type matches the 8-pin µMAX format. Ensure the suffix indicates the commercial temperature grade suitable for your operational environment. Cross-reference the ordering information table to validate the specific part number variant before finalizing procurement.

Selection Notes

Select this component when a steep roll-off is required for anti-aliasing or post-DAC applications in single-supply systems. The fixed elliptic response simplifies design by limiting tasks to clock frequency selection. Consider the internal oscillator or external clock options based on the required cutoff-frequency control precision and system synchronization needs.

Part Context

This device belongs to the MAX7408/MAX7411/MAX7412/MAX7415 family of switched-capacitor filters. While sharing similar architectures, variants differ in supply voltage requirements (+5V vs +3V) and transition ratios (1.6 vs 1.25). The MAX7408 specifically targets +5V applications with a 1.6 transition ratio, distinguishing it from the sharper but lower-rejection MAX7411.

Replacement Considerations

Direct functional substitutes within the same family include the MAX7411CUA+T, which offers a sharper rolloff but requires verifying the transition ratio compatibility. Other series members like the MAX291 or MAX292 may serve as alternatives for different supply voltages or filter types, though pinouts and electrical characteristics must be carefully compared.