MAX7404CSA+

Overview

The MAX7404CSA+ is an 8th-order, lowpass, elliptic switched-capacitor filter operating from a single +3V supply. It features a corner frequency range of 1Hz to 10kHz with a 100:1 clock-to-corner ratio. The device provides -82dB stopband rejection and a transition ratio of 1.5. Supply current is 2mA in normal mode and 0.2µA in shutdown. It includes an offset adjustment pin and operates within a temperature range of 0°C to +70°C.

Feature Summary

• 8th-order elliptic lowpass response with sharp rolloff
• Single +3V supply operation with low power consumption
• Clock-tunable corner frequency via internal or external clocking
• Shutdown mode for ultra-low standby current

Applications

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

Procurement Notes

Verify the suffix 'CSA+' indicates the commercial temperature range (0°C to +70°C) and SOIC-8 package. Confirm RoHS compliance status through official documentation. Ensure ordering matches the specific voltage and performance requirements for the MAX7404 variant.

Selection Notes

Select the MAX7404CSA+ when a +3V single-supply system requires high-stopband rejection (-82dB). Choose this part over the MAX7407 if a transition ratio of 1.5 is acceptable instead of 1.2. Verify that the required corner frequency can be achieved with available clock frequencies.

Part Context

The MAX7404CSA+ belongs to the MAX7400 family of 8th-order switched-capacitor filters. It shares the same elliptic response characteristics as the MAX7400 but operates at a lower +3V supply voltage. The 'C' suffix denotes the commercial temperature range, while 'SA' specifies the 8-pin SO package.

Replacement Considerations

MAX7400ESA+ offers identical electrical performance but requires a +5V supply. MAX7407CSA+ provides a steeper rolloff (transition ratio 1.2) but lower stopband rejection (-60dB). Both operate on +3V supplies.