MAX7403CPA+

Overview

The MAX7403CPA+ 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 ranges from 1Hz to 10kHz, determined by a clock input or internal oscillator via a 100:1 ratio. Supply current is 2mA in normal mode and 0.2µA in shutdown. It 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 PDIP package.

Feature Summary

• Provides high-selectivity filtering with an 8th-order elliptic response and a steep transition ratio of 1.2
• Supports flexible clocking through either an external signal or an internal oscillator set by a single capacitor
• Includes a dedicated offset adjustment pin allowing precise control over the DC output voltage level
• Features a low-power shutdown mode that reduces supply current to microampere levels

Applications

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

Procurement Notes

Verify the component matches the specific MAX7403 variant with the CPA+ suffix, which indicates the commercial temperature grade and lead-free construction. Confirm the package type is the 8-pin plastic DIP as specified. Ensure the source provides valid traceability documentation for Analog Devices/Maxim Integrated products to guarantee authenticity and compliance with RoHS standards.

Selection Notes

Select the MAX7403CPA+ when a sharper rolloff than the MAX7400 is required, specifically utilizing its 1.2 transition ratio. This part is suitable for applications needing a fixed elliptic response without complex external component tuning. Ensure the system design accommodates the +5V single-supply requirement and provides the necessary clock frequency to achieve the desired corner frequency within the 1Hz to 10kHz range.

Part Context

This device belongs to the MAX7400 family of switched-capacitor filters, which also includes the MAX7400, MAX7404, and MAX7407. While sharing similar architectures and pinouts, the MAX7403 is distinct due to its +5V operation and specific elliptic response characteristics. It serves as a specialized solution for designers requiring higher selectivity compared to the standard MAX7400 model.

Replacement Considerations

The MAX7400CPA+ is a compatible alternative if a transition ratio of 1.5 is acceptable instead of 1.2. For surface-mount requirements, the MAX7403CSA+ offers the same electrical performance in an 8-SOIC package. Verify that any substitute maintains the +5V supply and commercial temperature range specifications.