MAX7426CPA+

Overview

The MAX7426CPA+ is a fifth-order, lowpass, elliptic switched-capacitor filter operating from a single +5V supply. It features a clock-to-corner frequency ratio of 100:1, enabling corner frequencies between 1Hz and 12kHz. The device draws 0.8mA in operating mode and reduces to 0.2µA in shutdown mode. Key electrical parameters include -80dB THD plus noise, ±4mV output offset voltage, and 37dB stopband rejection with a transition ratio of 1.25. It supports self-clocking via an external capacitor or external clock input for tighter control.

Feature Summary

• Fifth-order elliptic lowpass filter topology providing sharp rolloff
• Clock-tunable corner frequency range from 1Hz to 12kHz
• Low power consumption with dedicated shutdown mode
• Single-supply operation optimized for +5V systems

Applications

• ADC anti-aliasing filtering
• Post-DAC signal conditioning
• Speech processing systems
• CT2 base station applications

Procurement Notes

Verify the component marking matches the specific part number prefix and suffix configuration. Confirm the package type corresponds to the standard plastic DIP variant. Ensure the temperature grade aligns with the intended operational environment requirements before finalizing procurement orders.

Selection Notes

Select this component when a steep roll-off characteristic is required for anti-aliasing or post-DAC filtering in single-supply environments. The fixed elliptic response simplifies design by limiting tasks to clock frequency selection. Consider the MAX7427 if a +3V supply rail is available instead of +5V.

Part Context

This device belongs to the MAX7426/MAX7427 family of switched-capacitor filters manufactured by Analog Devices / Maxim Integrated. The CP suffix indicates a commercial temperature range of 0°C to +70°C housed in an 8-pin PDIP package. The E version extends the range to -40°C to +85°C.

Replacement Considerations

The MAX7427 serves as the primary alternative for +3V supply applications. Other Maxim SCF families like MAX291 or MAX295 may be considered but require different clock ratios and pin configurations.