MAX7414EUA+T

Overview

The MAX7414EUA+T is a fifth-order, lowpass switched-capacitor filter with a Butterworth 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 from 1Hz to 15kHz via an external clock or internal oscillator (fOSC = 30 x 10³ / COSC). Key parameters include ±4mV output offset voltage, 100:1 clock-to-corner ratio, and -81dB THD+N at fIN = 0.5fc. It features a 8-pin µMAX package and operates within a -40°C to +85°C temperature range.

Feature Summary

• Butterworth filter response for maximally flat passband
• Clock-tunable corner frequency from 1Hz to 15kHz
• Low-power operation with dedicated shutdown mode
• Internal oscillator or external clock input options

Applications

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

Procurement Notes

Verify the component matches the specific Maxim Integrated part number MAX7414EUA+T. Confirm the suffix 'E' indicates the extended temperature range of -40°C to +85°C and 'UA+' denotes the 8-pin µMAX package with lead-free/RoHS compliance. Ensure the datasheet revision aligns with the required specifications before procurement.

Selection Notes

Select this device when a maximally flat Butterworth response is required for instrumentation applications. Choose between internal capacitor-based oscillation or external clocking based on the need for precise corner frequency control. Verify that the single +3V supply constraint fits the system power architecture and that the 1.2mA current draw meets power budget requirements.

Part Context

This component belongs to the MAX7409/MAX7410/MAX7413/MAX7414 family of fifth-order lowpass switched-capacitor filters. While the MAX7409/7413 offer Bessel responses, the MAX7414 specifically provides a Butterworth characteristic. It shares the same pinout and general architecture as its siblings but differs in filter response and operating voltage (+3V vs +5V for the C/U variants).

Replacement Considerations

Public confirmed substitutes include MAX7414CUA+, MAX7414EPA, and MAX7414CPA. These parts share the same Butterworth response and +3V operation but differ in temperature range (-40°C to +85°C for E, 0°C to +70°C for C/P) and package type (µMAX for UA/E, Plastic DIP for PA/CP).

FAQ

How is the corner frequency determined?

The corner frequency (fc) is set by the clock frequency (fCLK) divided by 100. It can be driven by an external clock or an internal oscillator defined by an external capacitor connected to the CLK pin.

What is the function of the OS pin?

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

How does the shutdown mode work?

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.