MAX7403CSA+

Overview

The MAX7403CSA+ is an 8th-order, lowpass, elliptic switched-capacitor filter operating from a single +5V supply. It features a sharp rolloff with a transition ratio of 1.2 and typical stopband rejection of 60dB. The corner frequency is tunable from 1Hz to 10kHz via a clock input or internal oscillator set by an external capacitor, maintaining a 100:1 clock-to-corner ratio. Supply current is 2mA in normal mode and reduces to 0.2µA in shutdown mode. The device includes an offset adjustment pin (OS) for DC level control and operates within a commercial temperature range of 0°C to +70°C in an 8-pin SO package.

Feature Summary

• Provides steep attenuation characteristics suitable for precise signal conditioning
• Supports flexible clocking through either an external source or an internal oscillator
• Includes a dedicated pin for adjusting the DC output offset voltage
• Offers a low-power shutdown mode to minimize energy consumption

Applications

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

Procurement Notes

Verify the component authenticity by checking the manufacturer markings against official documentation. Ensure the ordering suffix matches the required temperature grade and package type. Confirm that the specific variant aligns with the system's power supply and performance requirements before finalizing procurement.

Selection Notes

Select this component when an 8th-order elliptic response with a 1.2 transition ratio is required. It is designed for single +5V operation, distinguishing it from the +3V variants. Consider the internal oscillator capability if external clock generation is undesirable. Verify that the 60dB stopband rejection meets the application's noise suppression needs.

Part Context

This part belongs to the MAX7400 family of switched-capacitor filters, which also includes the MAX7400, MAX7404, and MAX7407. These devices share similar architectures but differ in operating voltage and filter response characteristics. The MAX7403 specifically provides a sharper rolloff than the MAX7400 while operating at the same +5V supply level.

Replacement Considerations

The MAX7400 offers a similar 8th-order elliptic response but with a 1.5 transition ratio and 82dB stopband rejection. The MAX7404 and MAX7407 provide comparable functionality but operate on a +3V supply instead of +5V.