MAX7405ESA+

Overview

The MAX7405ESA+ is an 8th-order, lowpass, Bessel switched-capacitor filter designed for single-supply operation at +3V. It features 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 operates within a temperature range of -40°C to +85°C and is housed in an 8-pin SO package.

Feature Summary

• Provides 8th-order lowpass Bessel filtering characteristics for fast settling and low overshoot.
• Supports both self-clocking via external capacitor and external clock input for precise corner frequency control.
• Includes a dedicated shutdown pin to minimize power consumption during idle periods.
• Features an offset adjust pin allowing DC output level adjustment or connection to common mode.

Applications

• ADC anti-aliasing
• Post-DAC filtering
• Speech processing

Procurement Notes

Verify the specific suffix 'E' indicates the extended industrial temperature range (-40°C to +85°C) compared to commercial variants. Confirm the '+'' denotes lead-free and RoHS compliance status as per manufacturer standards. Ensure the 8-SOIC package dimensions match the target PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component when a high-order Bessel response is required for signal integrity preservation in low-power applications. The MAX7405 is specifically optimized for +3V single-supply systems, whereas the MAX7401 variant supports +5V supplies. Consider the internal oscillator simplicity versus external clock precision based on the application's timing stability needs.

Part Context

This part belongs to the MAX740x family of switched-capacitor filters manufactured by Analog Devices / Maxim Integrated. It shares architectural similarities with the MAX7401 but differs in supply voltage requirements. The family is designed to simplify analog filter design by eliminating the need for external resistors and capacitors for the filter core, relying instead on clock frequency setting.

Replacement Considerations

Direct functional substitutes within the same family include the MAX7401ESA+ for +5V applications. Cross-family replacements may require careful evaluation of supply voltage compatibility and pin configuration alignment.