MAX7401CSA+

Overview

The MAX7401CSA+ is an 8th-order, lowpass, Bessel switched-capacitor filter from Analog Devices Inc./Maxim Integrated. It operates on a single +5V supply and 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. It offers -82dB THD+N, ±5mV output offset, and supports both internal oscillator (via external capacitor) and external clocking. Packaged in an 8-pin SOIC, it functions within a 0°C to +70°C temperature range.

Feature Summary

• 8th-order lowpass Bessel response for fast settling and minimal overshoot
• Clock-tunable corner frequency adjustable from 1Hz to 5kHz
• Low power consumption with dedicated shutdown mode
• Flexible clocking options including internal oscillator or external drive

Applications

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

Procurement Notes

Verify the component matches the exact part number MAX7401CSA+. Confirm the manufacturer is Analog Devices Inc. or Maxim Integrated. Ensure the package type is 8-pin SOIC. Check that the temperature range corresponds to commercial grade (0°C to +70°C). Validate authenticity through authorized distribution channels.

Selection Notes

Select this component when an 8th-order Bessel filter response is required for signal conditioning. It is suitable for applications needing precise corner frequency control via clock adjustment. Consider the single +5V supply requirement and low power shutdown capability. Evaluate if the 100:1 clock-to-corner ratio meets system timing constraints.

Part Context

This component belongs to the MAX7401/MAX7405 family of switched-capacitor filters. The MAX7401 variant specifically requires a +5V supply, whereas the MAX7405 operates at +3V. Both share identical filter characteristics but differ in voltage requirements. The 'CSA' suffix indicates the commercial temperature range and SOIC package.

Replacement Considerations

The MAX7405 serves as a functional substitute if the application can accommodate a +3V supply instead of +5V. Other members of the MAX740x family may be considered if pin compatibility and filter order match the design requirements.