MAX7405CSA+

Overview

The MAX7405CSA+ is an 8th-order, lowpass, Bessel switched-capacitor filter designed for single-supply +3V operation. It provides a clock-tunable corner frequency ranging from 1Hz to 5kHz with a fixed 100:1 clock-to-corner ratio. The device draws 2mA in operating mode and reduces to 0.2µA in shutdown mode. Key electrical parameters include a typical supply voltage of 3V (range 2.7V to 3.6V), output offset voltage of ±5mV, and total harmonic distortion plus noise of -84dB. It features self-clocking via an external capacitor or external clock input, housed in an 8-pin SOIC package.

Feature Summary

• 8th-order lowpass Bessel response providing fast settling and low overshoot
• Clock-tunable corner frequency adjustable from 1Hz to 5kHz
• Low-power shutdown mode reducing current consumption to 0.2µA
• Single +3V supply operation with low output offset voltage

Applications

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

Procurement Notes

Verify the component matches the specific +3V supply requirement, as the MAX7401 variant operates at +5V. Confirm the ordering suffix 'CSA+' indicates the commercial temperature range (0°C to +70°C) and lead-free status. Ensure the datasheet version aligns with the required specifications before finalizing procurement orders.

Selection Notes

Select the MAX7405CSA+ when a single +3V supply is available and low power consumption is critical. Choose this part over the MAX7401 if the system voltage does not support +5V. Consider the internal oscillator simplicity versus external clock precision based on the required corner frequency stability. Verify that the 100:1 clock-to-corner ratio meets the design constraints for the target application bandwidth.

Part Context

The MAX7405 is part of the MAX7401/MAX7405 family of 8th-order switched-capacitor filters. While electrically identical in filter performance, it differs from the MAX7401 by its optimized +3V single-supply operation. Both share the same Bessel response characteristics and pinout, allowing for functional similarity in designs requiring different supply voltages.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified source material.