MAX292CSA+

Overview

The MAX292CSA+ is an 8th-order, lowpass, switched-capacitor filter in the MAX291 series. It provides a Bessel response with a clock-to-corner frequency ratio of 100:1 and a maximum corner frequency of 25kHz. The device operates on single +4.75V to +11V or dual ±2.375V to ±5.5V supplies. It features an internal oscillator requiring only an external capacitor, or accepts an external clock signal. An uncommitted operational amplifier is included for post-filtering or anti-aliasing tasks.

Feature Summary

• Bessel filter response providing low overshoot and fast settling times
• Clock-tunable corner frequency range from 0.1Hz to 25kHz
• Internal oscillator or external clock input capability
• Integrated uncommitted operational amplifier

Applications

• ADC anti-aliasing filtering
• DAC post-filtering
• Noise analysis
• 50Hz/60Hz line-noise filtering

Procurement Notes

Verify the component against official Analog Devices documentation to confirm the specific package type and temperature rating. Ensure that the ordering suffix matches the required industrial specifications. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and current availability status before procurement.

Selection Notes

Select this component when a maximally flat phase response and rapid settling are required for multiplexed signal paths. Verify that the application requires a fixed 8th-order Bessel characteristic rather than a Butterworth response. Confirm that the system can provide a stable clock signal within the specified voltage levels for optimal performance.

Part Context

This component belongs to the MAX291/MAX292/MAX295/MAX296 family of 8th-order lowpass switched-capacitor filters. The MAX292 variant specifically implements a Bessel response, distinguishing it from the MAX291's Butterworth response. All members share similar pinouts and operating principles but differ in their frequency response characteristics and maximum corner frequencies.

Replacement Considerations

The MAX291CSA+ serves as a functional substitute if a Butterworth response is acceptable instead of the Bessel response. Other variants within the MAX291 series may be considered based on specific temperature ranges or package requirements.

FAQ

What is the difference between the MAX292 and MAX291 responses?

The MAX292 provides a Bessel response characterized by linear phase shift and fast settling, whereas the MAX291 offers a Butterworth response with a maximally flat passband.

How is the corner frequency determined?

The corner frequency is set by the clock frequency applied to the CLK pin, utilizing a 100:1 clock-to-corner frequency ratio for the MAX292.

Can the internal oscillator be used without an external clock?

Yes, an external capacitor connected to the CLK pin generates the internal clock signal, eliminating the need for an external clock source.