MAX7413EUA+T

Overview

The MAX7413EUA+T is a fifth-order, lowpass switched-capacitor filter with a Bessel response. It operates from a single +3V supply and draws 1.2mA in active mode, reducing to 0.2µA in shutdown. The corner frequency is tunable between 1Hz and 15kHz via an external clock or internal oscillator. Key parameters include a ±4mV output offset voltage, 70dB power-supply rejection ratio, and a 100:1 clock-to-corner frequency ratio. It is housed in an 8-pin µMAX package.

Feature Summary

• Bessel filter response for fast settling and low overshoot
• Low-power operation with dedicated shutdown mode
• Flexible clocking options using internal or external sources
• Adjustable DC output level via offset pin

Applications

• ADC anti-aliasing
• DAC post-filtering
• Speech processing
• CT2 base stations

Procurement Notes

Verify the component origin through official manufacturer channels or authorized distributors. Confirm that the ordering suffix matches the required temperature range and packaging specifications. Ensure compliance with relevant environmental standards before integration into production systems.

Selection Notes

Select this device when a Bessel response is required for signal integrity. Verify that the system operates on a single +3V supply. Ensure the application can accommodate the specific 8-pin µMAX footprint and thermal requirements associated with the extended industrial temperature range.

Part Context

This component belongs to the MAX7409/MAX7410/MAX7413/MAX7414 family of fifth-order lowpass switched-capacitor filters. While sharing similar architectures, the MAX7413 is distinguished by its +3V operating voltage and Bessel response characteristics, differentiating it from the +5V variants and Butterworth counterparts.

Replacement Considerations

The MAX7409 serves as a functional substitute if the system supports a +5V supply. Other members of the MAX74xx series may be considered based on specific response curve requirements and available supply voltages.

FAQ

How is the corner frequency determined?

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

What is the purpose of the OS pin?

The Offset Adjust (OS) pin allows for the adjustment of the DC output level. It can be connected to COM for no adjustment or driven by an external bias voltage for DC level shifting.

How does the shutdown mode function?

Driving the SHDN pin low activates shutdown mode, which reduces the supply current to 0.2µA and places the output in a high-impedance state.