MAX7415EPA+

Overview

The MAX7415EPA+ is a 5th-order, lowpass, elliptic switched-capacitor filter operating from a single +3V supply. It features a transition ratio of 1.25 and provides 37dB of stopband rejection. The device draws 1.2mA in operating mode and reduces to 0.2µA in shutdown mode. It supports corner frequencies from 1Hz to 15kHz via internal or external clocking. Key electrical parameters include ±4mV output offset voltage, -80dB THD plus noise, and a maximum capacitive load of 500pF at the output.

Feature Summary

• Provides sharp rolloff with a transition ratio of 1.25 for effective anti-aliasing and post-DAC filtering.
• Operates on a single +3V supply with ultra-low power consumption in shutdown mode.
• Features an adjustable DC output level through the dedicated offset-adjust pin.

Applications

• ADC Anti-Aliasing
• Post-DAC Filtering
• Speech Processing

Procurement Notes

Verify the specific suffix 'EPA+' against the manufacturer's current ordering guide to confirm the package type, temperature range, and lead-free status. Ensure the component meets RoHS compliance requirements for your assembly process. Cross-reference the datasheet revision date to validate all electrical characteristics before finalizing procurement specifications.

Selection Notes

Select the MAX7415EPA+ when a single +3V supply is required alongside a steep transition ratio of 1.25. This model is appropriate for applications needing 37dB stopband rejection. Compare against the MAX7408 if higher stopband rejection is prioritized over rolloff steepness. Verify that the 15kHz maximum corner frequency aligns with the system bandwidth requirements.

Part Context

This component belongs to the MAX7408/MAX7411/MAX7412/MAX7415 family of 5th-order elliptic switched-capacitor filters. The MAX7415 variant is specifically designed for +3V operation, distinguishing it from the +5V MAX7408 and MAX7411 models within the same series.

Replacement Considerations

The MAX7408 serves as a functional substitute for similar filtering tasks but requires a +5V supply instead of +3V. Designers must account for the difference in transition ratios (1.6 vs 1.25) and stopband rejection levels when swapping between these variants.

FAQ

How is the corner frequency determined?

The corner frequency is set by the clock frequency using a 100:1 ratio. It can be controlled via an external clock source or an internal oscillator defined by an external capacitor connected to the CLK pin.

What is the purpose of the OS pin?

The OS (Offset Adjust) pin allows for the adjustment of the DC output level. It should be connected to COM if no offset adjustment is needed, or biased with a resistive divider for DC level shifting.

How does the device handle low-power modes?

Driving the SHDN pin low activates shutdown mode, reducing supply current to 0.2µA and placing the output in a high-impedance state. Driving SHDN high or connecting it to VDD returns the device to normal operation.