MAX7423CUA+

Overview

The MAX7423CUA+ is a fifth-order, low-pass switched-capacitor filter (SCF) from the MAX7418–MAX7425 series. It provides a Bessel response with a corner frequency range of 1Hz to 45kHz and operates on a single +3V supply. The device draws 3mA in operating mode and reduces to 0.2μA in shutdown mode. It features a 100:1 clock-to-corner frequency ratio, ±4mV typical output offset voltage, and -81dB THD+N at 2kHz input. The component is housed in an 8-pin μMAX package and supports internal or external clocking for flexible frequency control.

Feature Summary

• Bessel filter response optimized for low overshoot and fast settling times
• Switched-capacitor architecture enabling precise corner frequency tuning via clock signal
• Low-power operation with dedicated shutdown mode reducing current consumption significantly
• Single-supply compatibility with integrated offset adjustment capabilities

Applications

• ADC anti-aliasing filtering
• DAC post-filtering
• CT2 base stations
• Speech processing

Procurement Notes

Verify the specific suffix 'CUA+' against official Analog Devices documentation to confirm the commercial temperature range and RoHS compliance status. Ensure the ordering part number matches the exact package type and thermal rating required for your application environment before finalizing procurement.

Selection Notes

Select the MAX7423CUA+ when a maximally flat phase response and rapid settling are required, such as in multiplexed ADC inputs. Compare it against elliptic variants if sharper rolloff is needed instead of linear phase characteristics. Confirm that the system power budget accommodates the 3mA operating current and that a suitable clock source is available for the desired cutoff frequency.

Part Context

This component belongs to the MAX7418–MAX7425 family of fifth-order low-pass switched-capacitor filters. While other members offer elliptic or Butterworth responses, the MAX7423 specifically delivers Bessel characteristics. It shares the same physical footprint and basic interface requirements as its siblings but differs in internal filter topology and frequency response behavior.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified datasheet. Designers should consult Analog Devices for potential cross-references or updated product line replacements.