MAX7407CSA+

Overview

The MAX7407CSA+ is an 8th-order, lowpass, elliptic switched-capacitor filter designed for single +3V supply operation. It provides a sharp rolloff with a transition ratio of 1.2 and typical stopband rejection of 60dB. The corner frequency is tunable from 1Hz to 10kHz via a 100:1 clock-to-corner ratio using either an external capacitor or an external clock signal. Operating current is 2mA, reducing to 0.2µA in shutdown mode. The device features a low output offset voltage of ±5mV and includes an offset adjustment pin (OS) for DC level shifting. It is housed in an 8-pin SO package.

Feature Summary

• 8th-order elliptic response with steep rolloff
• Single-supply +3V operation
• Clock-tunable corner frequency
• Low-power shutdown capability

Applications

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

Procurement Notes

Verify the component against official Analog Devices documentation to confirm authenticity and specifications. Ensure the ordering suffix matches the required temperature range and package type. Check for RoHS compliance status as indicated in the datasheet. Confirm availability through authorized distributors given potential lifecycle changes.

Selection Notes

Select the MAX7407CSA+ when a +3V supply is available and a sharper rolloff than the MAX7400/MAX7404 is required. Choose this part over the MAX7403 if lower voltage operation is necessary. Consider the internal oscillator requirements and ensure appropriate decoupling capacitors are used for stable clock frequency generation.

Part Context

This component belongs to the MAX7400 family of 8th-order lowpass elliptic filters. It shares functional similarities with the MAX7400, MAX7403, and MAX7404 but is specifically optimized for +3V operation. The family utilizes a switched-capacitor architecture that emulates passive ladder networks for improved component sensitivity.

Replacement Considerations

The MAX7403 serves as a direct functional substitute within the same family, offering identical elliptic characteristics but operating at +5V instead of +3V. Designers must verify supply voltage compatibility when substituting.