MAX7413EUA+

Overview

The MAX7413EUA+ is a fifth-order, lowpass switched-capacitor filter with a Bessel response. It operates from a single +3V supply and draws 1.2mA in normal mode, reducing to 0.2µA in shutdown. The corner frequency is tunable from 1Hz to 15kHz via an external clock or internal oscillator (fOSC = 30 x 10³ / COSC). Key electrical parameters include ±4mV typical output offset voltage, 70dB power-supply rejection ratio, and -81dB typical THD+N. It features a 100:1 clock-to-corner ratio and operates within a -40°C to +85°C temperature range.

Feature Summary

• Bessel filter response for fast settling and low overshoot
• Single +3V supply operation with low-power shutdown capability
• Clock-tunable corner frequency from 1Hz to 15kHz
• Low output offset voltage of ±4mV

Applications

• ADC anti-aliasing
• DAC postfiltering
• Speech processing
• CT2 base stations
• Air-bag electronics

Procurement Notes

Verify the component matches the specific +3V operating voltage requirement, as the family includes +5V variants. Confirm the Bessel response characteristic is suitable for the application's transient requirements. Ensure the 8-pin µMAX package dimensions align with the PCB layout constraints. Check that the ordering suffix corresponds to the required industrial temperature range.

Selection Notes

Select this device when a maximally flat passband is not required and fast settling time after channel switching is critical. Compare against the MAX7414 if a Butterworth response is preferred instead. Ensure the system can provide a stable clock signal or appropriate capacitor for the internal oscillator. Verify that the input signal amplitude remains within the optimal range to minimize harmonic distortion.

Part Context

The MAX7413EUA+ belongs to the MAX7409/MAX7410/MAX7413/MAX7414 family of fifth-order lowpass switched-capacitor filters. It is distinguished by its Bessel response and +3V single-supply operation. Other family members offer different responses or supply voltages, such as the MAX7414 which provides a Butterworth response on a +3V supply.

Replacement Considerations

The MAX7414EUA+ is a direct pin-compatible alternative within the same family, offering a Butterworth response instead of Bessel. For applications requiring a +5V supply, the MAX7409EUA+ provides the same Bessel response but operates at a higher voltage.