MAX7415CPA+

Overview

The MAX7415CPA+ is a 5th-order, lowpass, elliptic switched-capacitor filter operating from a single +3V supply. It draws 1.2mA in normal mode and 0.2µA in shutdown mode. The device features a clock-to-corner frequency ratio of 100:1, allowing corner frequencies from 0.001kHz to 15kHz. It provides a transition ratio of 1.25 with typical stopband rejection of 37dB. Total harmonic distortion plus noise is -79dB. The output offset voltage is ±4mV typical. It operates within a temperature range of 0°C to +70°C and is housed in an 8-pin Plastic DIP package.

Feature Summary

• Provides 5th-order elliptic lowpass filtering characteristics with sharp rolloff.
• Supports both internal oscillator and external clocking for corner frequency tuning.
• Includes a dedicated offset-adjust pin for DC output level control.
• Features a low-power shutdown mode reducing current consumption significantly.

Applications

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

Procurement Notes

Verify the component marking against the official datasheet to confirm the MAX7415 part number and manufacturer identification. Ensure the package type matches the specified 8-pin DIP configuration. Check for any specific environmental compliance markings required by the target application standards.

Selection Notes

Select this component when a single +3V supply operation is required for elliptic filtering. Choose between internal or external clocking based on the need for cutoff-frequency precision. Consider the transition ratio of 1.25 if steeper rolloff is prioritized over higher stopband rejection compared to other family members.

Part Context

This device belongs to the MAX7408/MAX7411/MAX7412/MAX7415 family of 5th-order, lowpass, elliptic, switched-capacitor filters. It shares architectural similarities with the MAX7408, MAX7411, and MAX7412 but is specifically optimized for +3V single-supply operation.

Replacement Considerations

The MAX7412 serves as a functional substitute within the same family, offering identical electrical performance but requiring a +5V supply instead of +3V. Verify supply voltage compatibility before substitution.

FAQ

How is the corner frequency determined?

The corner frequency is set by the clock frequency using a fixed 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 function of the OS pin?

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

How does the device achieve low power consumption?

The device enters a low-power shutdown mode when the SHDN pin is driven low, reducing the supply current to 0.2µA. In normal operation, it consumes approximately 1.2mA.