MAX7414CUA+T

Overview

The MAX7414CUA+T is a 5th-order, lowpass, switched-capacitor filter (SCF) from the MAX7409/MAX7410/MAX7413/MAX7414 family. It operates from a single +3V supply and draws 1.2mA in active mode, reducing to 0.2µA in shutdown. The device provides a Butterworth response with a clock-tunable corner frequency ranging from 1Hz to 15kHz, determined by a fixed 100:1 clock-to-corner ratio. Key electrical parameters include a typical output offset voltage of ±4mV, a power-supply rejection ratio of 70dB, and an internal oscillator frequency defined by an external capacitor at the CLK pin.

Feature Summary

• Butterworth filter response for maximally flat passband performance
• Low-power operation with dedicated shutdown mode
• Flexible clocking via internal oscillator or external signal
• Adjustable DC output level through offset adjust pin

Applications

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

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when sourcing. Confirm the 'C' designation aligns with the required commercial temperature range of 0°C to +70°C. Ensure the '+T' suffix corresponds to lead-free and RoHS compliance standards as per manufacturer specifications before finalizing procurement orders.

Selection Notes

Select this component for applications requiring a maximally flat magnitude response within a low-power environment. The +3V supply requirement distinguishes it from the +5V variants in the same family. Designers must account for the 100:1 clock-to-corner frequency ratio when determining the necessary clock source frequency to achieve the desired cutoff point.

Part Context

This part belongs to the MAX74xx series of 5th-order switched-capacitor filters manufactured by Analog Devices/Maxim Integrated. It shares the same physical package and pinout with the MAX7409, MAX7410, and MAX7413, differing primarily in its Butterworth response characteristic and +3V operating voltage specification compared to other members of the family.

Replacement Considerations

MAX7413CUA+T offers identical form factor but provides a Bessel response instead of Butterworth.

FAQ

How is the corner frequency determined?

The corner frequency is set by dividing the clock frequency by 100, utilizing either an external clock or an internal oscillator controlled by a capacitor on 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 by connecting it to an external bias voltage or tying it to the COM pin if no adjustment is needed.

How does the device handle power consumption during idle states?

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