MAX7408CPA+

Overview

The MAX7408CPA+ is a 5th-order, lowpass, elliptic switched-capacitor filter operating from a single +5V supply. It features a clock-to-corner frequency ratio of 100:1, allowing corner frequencies from 1Hz to 15kHz. The device provides a transition ratio of 1.6 and typically 53dB of stopband rejection. Supply current is 1.2mA in operating mode and reduces to 0.2µA in shutdown mode. It operates within a temperature range of 0°C to +70°C and is housed in an 8-pin Plastic DIP package.

Feature Summary

• 5th-order elliptic lowpass filter with sharp rolloff
• Clock-tunable corner frequency from 1Hz to 15kHz
• Low power consumption with dedicated shutdown mode
• Single-supply operation at +5V

Applications

• ADC anti-aliasing
• Post-DAC filtering
• Speech processing

Procurement Notes

Verify the specific ordering suffix CPA+ against the manufacturer's official documentation to confirm the package type (Plastic DIP) and commercial temperature range (0°C to +70°C). Ensure compatibility with single +5V supply requirements and check for any RoHS compliance updates in the latest datasheet revision before procurement.

Selection Notes

Select this component when a steep rolloff with moderate stopband rejection is required for single-supply applications. The MAX7408 offers a transition ratio of 1.6, distinguishing it from the sharper but less rejecting MAX7411/MAX7415 variants. Verify that the system can provide a stable clock signal or appropriate external capacitor for internal oscillator tuning.

Part Context

The MAX7408 belongs to a family of 5th-order elliptic switched-capacitor filters including the MAX7411, MAX7412, and MAX7415. These devices share similar architectures but differ in operating voltage (+5V vs +3V) and transition ratios (1.6 vs 1.25). The MAX7408 specifically targets +5V systems requiring a balance between rolloff steepness and stopband attenuation.

Replacement Considerations

The MAX7411CPA+ serves as a functional substitute if a sharper rolloff (transition ratio 1.25) is acceptable and stopband rejection requirements are relaxed to approximately 37dB. Both operate on a +5V supply and share the same pinout.