MAX7404EPA+

Overview

The MAX7404EPA+ is an 8th-order, lowpass, elliptic switched-capacitor filter operating from a single +3V supply. It provides a sharp rolloff with a transition ratio of 1.5 and typical stopband rejection of 82dB. The corner frequency is tunable from 1Hz to 10kHz via a 100:1 clock-to-corner ratio using either an internal oscillator or external clock. Supply current is 2mA in normal mode and reduces to 0.2µA in shutdown mode. The device features a low output offset voltage of ±5mV and operates within a temperature range of -40°C to +85°C.

Feature Summary

• 8th-order elliptic filter response with steep rolloff
• Clock-tunable corner frequency for precise filtering
• Low-power operation with dedicated shutdown mode
• Single-supply compatibility with offset adjustment capability

Applications

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

Procurement Notes

Verify the component matches the specific +3V supply requirement and elliptic filter characteristics. Confirm the package type is 8-pin Plastic DIP (PDIP) and the extended temperature rating (-40°C to +85°C). Ensure the ordering suffix corresponds to the exact variant needed for your design constraints.

Selection Notes

Select this component when a high-order lowpass filter is required with a fixed elliptic response. It is suitable for applications needing a sharp transition ratio of 1.5 and significant stopband rejection. Consider the 100:1 clock-to-corner ratio for flexible frequency tuning. Verify that the single +3V supply aligns with system power rails.

Part Context

The MAX7404EPA+ belongs to the MAX7400 family of 8th-order switched-capacitor filters. This family includes variants operating at +5V and +3V supplies with different transition ratios. The MAX7404 specifically targets +3V systems with an elliptic response optimized for anti-aliasing and post-DAC filtering applications requiring high stopband attenuation.

Replacement Considerations

MAX7400EPA+ requires a +5V supply instead of +3V. MAX7403EPA+ offers a sharper rolloff with a transition ratio of 1.2 but also requires a +5V supply. MAX7407EPA+ shares the +3V supply but has a transition ratio of 1.2.