MAX7405CPA

Overview

The MAX7405CPA is an eighth-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 100:1 clock-to-corner ratio. The device draws 2mA in operating mode and reduces current to 0.2µA in shutdown mode. Key electrical specifications include -82dB THD plus noise performance and a low output offset of ±5mV. It supports self-clocking via an external capacitor or external clocking for precise control. The component is housed in an 8-pin PDIP package.

Feature Summary

• Provides eighth-order lowpass Bessel filtering characteristics with low overshoot and fast settling times.
• Offers flexible clocking options including self-clocking through an external capacitor or external clock input.
• Includes a dedicated offset adjust pin for DC output level calibration.
• Features a power-down shutdown mode to minimize supply current consumption.

Applications

• Anti-aliasing filters for analog-to-digital converters
• Post-DAC signal conditioning and filtering
• Speech processing systems

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm package type and temperature range. Ensure the design accounts for the +3V single-supply requirement and appropriate clock frequency selection for the desired cutoff. Confirm RoHS compliance status through the manufacturer's latest datasheet revision.

Selection Notes

Select this component when an eighth-order Bessel response is required for applications needing minimal phase distortion. Consider the MAX7401 variant if a +5V supply voltage is available instead of +3V. Evaluate the need for external clocking versus self-clocking based on the required corner frequency stability and system clock availability.

Part Context

The MAX7405CPA belongs to the MAX740x family of switched-capacitor filters manufactured by Analog Devices (Maxim Integrated). This series includes variants like the MAX7401 which operates at +5V. These devices are engineered for low-power, high-performance analog signal processing tasks where discrete RC networks would be impractical due to size or tuning complexity.

Replacement Considerations

The MAX7401CPA is a functional substitute requiring only a supply voltage adjustment from +3V to +5V. Verify pin compatibility and ensure the application circuit can accommodate the different supply rail requirements without modifying other components.