MAX291CWE+T

Overview

The MAX291CWE+T is an 8th-order, lowpass, switched-capacitor filter in the MAX291 series. It provides a Butterworth response with a corner frequency range of 0.1Hz to 25kHz. The device operates on a single +5V supply or dual ±5V supplies and features a clock-to-corner-frequency ratio of 100:1. It includes an internal oscillator controlled by an external capacitor or accepts an external clock signal. An uncommitted operational amplifier is integrated for post-filtering or anti-aliasing tasks. The component is housed in a 16-pin Wide SO package and supports operation within a temperature range of 0°C to +70°C.

Feature Summary

• Provides maximally flat passband response characteristic of Butterworth filters
• Enables dynamic adjustment of corner frequency via internal or external clock signals
• Integrates an uncommitted operational amplifier for additional filtering stages

Applications

• ADC Anti-Aliasing Filter
• DAC Post-Filtering
• Noise Analysis
• 50Hz/60Hz Line-Noise Filtering

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature rating. Confirm RoHS compliance status through official manufacturer documentation. Ensure the supplier provides valid traceability for the Analog Devices / Maxim Integrated brand. Cross-reference the part number against current datasheets to confirm active status and availability constraints.

Selection Notes

Select this component when a fixed 8th-order Butterworth response is required. Verify that the application requires a maximum corner frequency of 25kHz. Ensure the system can provide a stable clock signal at least 100 times the desired cutoff frequency. Confirm that the 16-pin Wide SO package fits the design layout constraints.

Part Context

This component belongs to the MAX291/MAX292/MAX295/MAX296 family of switched-capacitor filters. The MAX291 variant specifically offers a Butterworth response, whereas the MAX292 provides a Bessel response. Both share similar pinouts and operating principles but differ in their frequency domain characteristics.

Replacement Considerations

MAX291EWE+T (Extended Temperature Range)

FAQ

How is the corner frequency determined?

The corner frequency is set by the clock frequency applied to the CLK pin, maintaining a 100:1 ratio between the clock and the corner frequency.

Can the device operate with a single power supply?

Yes, it can operate with a single +5V supply or dual ±5V supplies.

What is the function of the OP OUT pin?

The OP OUT pin connects to an uncommitted operational amplifier that can be configured as a continuous-time lowpass filter for anti-aliasing or clock-noise filtering.