MAX7426EUA+T

Overview

The MAX7426EUA+T is a fifth-order, lowpass, elliptic switched-capacitor filter operating from a single +5V supply. It provides a sharp rolloff with a transition ratio of 1.25 and typically 37dB of stopband rejection. The corner frequency is clock-tunable from 1Hz to 12kHz using either an external clock or an internal oscillator set by an external capacitor. Supply current is 0.8mA in operating mode and reduces to 0.2µA in shutdown mode. The device features a low output offset voltage of ±4mV and total harmonic distortion plus noise of -80dB. It is housed in an 8-pin µMAX package.

Feature Summary

• Fifth-order elliptic lowpass response with steep rolloff
• Clock-tunable corner frequency for flexible design
• Low power consumption with dedicated shutdown mode
• Single-supply operation optimized for +5V systems

Applications

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

Procurement Notes

Verify the component against official Maxim Integrated datasheets to confirm electrical parameters and pinout compatibility. Ensure the ordering suffix matches the required temperature range and packaging specifications. Cross-reference part numbers with authorized distributors to validate authenticity and traceability before procurement.

Selection Notes

Select this component when a high-performance elliptic filter response is required within a single-supply system. The fixed transition ratio simplifies design compared to other filter types. Consider the internal oscillator versus external clock options based on the required cutoff frequency stability and tolerance needs for the specific application.

Part Context

This device belongs to the MAX7426/MAX7427 family of switched-capacitor filters. The MAX7426 variant is specifically designed for +5V operation, while the MAX7427 supports +3V supplies. Both share identical filter characteristics and pin configurations, differing primarily in their specified operating voltage ranges.

Replacement Considerations

The MAX7426CUA+T serves as a commercial grade alternative within the same package and functionality scope.

FAQ

How is the corner frequency determined?

The corner frequency is determined by the clock frequency applied to the CLK pin, maintaining a fixed 100:1 clock-to-corner frequency ratio.

What is the purpose 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.

How does the device achieve low power consumption?

The device enters a low-power shutdown mode when the SHDN pin is driven low, reducing supply current to 0.2µA.