MAX7411CUA+

Overview

The MAX7411CUA+ is a fifth-order, lowpass, elliptic switched-capacitor filter designed for single +5V supply operation. It features a sharp rolloff with a transition ratio of 1.25 and typical stopband rejection of 37dB. The device supports clock-tunable corner frequencies ranging from 1Hz to 15kHz via an internal oscillator or external clock input. Operating current is 1.2mA in active mode, reducing to 0.2µA in shutdown mode. It offers low noise and distortion (-80dB THD + Noise) and includes an offset-adjust pin for DC output level control. The component is housed in an 8-pin µMAX package.

Feature Summary

• Fifth-order elliptic lowpass response with steep rolloff characteristics
• Clock-tunable corner frequency range from 1Hz to 15kHz
• Low power consumption with dedicated shutdown mode
• Internal oscillator or external clocking options for frequency control

Applications

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

Procurement Notes

Verify the specific suffix 'CUA+' against the manufacturer's official documentation to confirm the operating temperature range (0°C to +70°C) and lead-free packaging status. Ensure the design environment supports the required +5V single-supply voltage and that the 8-pin µMAX footprint matches the PCB layout constraints. Cross-reference the part number with the latest datasheet revision to confirm pinout compatibility.

Selection Notes

Select the MAX7411CUA+ when a sharper rolloff than standard elliptic filters is required, indicated by its 1.25 transition ratio compared to the 1.6 ratio of similar devices like the MAX7408. This model is specifically optimized for +5V single-supply systems, distinguishing it from the +3V variants in the family. Consider the internal oscillator convenience if external clock generation is not feasible, noting the 100:1 clock-to-corner frequency ratio.

Part Context

This component belongs to the MAX7408/MAX7411/MAX7412/MAX7415 family of fifth-order, lowpass, elliptic switched-capacitor filters manufactured by Analog Devices Inc./Maxim Integrated. The family shares a common architecture but differs in supply voltage requirements (+5V vs +3V) and filter response characteristics (transition ratios of 1.6 vs 1.25). The MAX7411 represents the +5V variant with the steeper 1.25 transition ratio profile.

Replacement Considerations

The MAX7408 is a functional substitute within the same family but exhibits a different transition ratio of 1.6 and typically higher stopband rejection (53dB). Designers must account for the altered frequency response characteristics when swapping between these models, as the rolloff steepness and stopband attenuation profiles differ significantly.