MAX297CSA

Overview

The MAX297CSA is an active, eighth-order elliptic lowpass switched-capacitor filter manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 4.75 V to 11 V and supports cutoff frequencies up to 50 kHz. The device utilizes a single-channel architecture housed in an 8-pin SOIC package. Designed for industrial temperature ranges from 0°C to +70°C, it integrates clock generation capabilities internally. This component provides high selectivity with minimal external components, suitable for precision signal conditioning applications requiring steep roll-off characteristics.

Feature Summary

• Eighth-order elliptic response providing sharp attenuation beyond the passband
• Integrated clock oscillator eliminates need for external timing sources
• Switched-capacitor architecture allows precise frequency control via external resistor

Applications

• Anti-aliasing filters in data acquisition systems
• Signal conditioning for analog-to-digital converter inputs
• Noise reduction in instrumentation amplifier circuits

Procurement Notes

Verify the specific suffix against official datasheets to confirm package type and temperature grade. Ensure compatibility with existing clock frequencies derived from the external timing resistor. Confirm RoHS compliance status if required by assembly specifications. Cross-reference manufacturer part numbers to avoid obsolete variants.

Selection Notes

Select this component when high-order filtering is required without complex discrete networks. Verify that the system clock frequency aligns with the filter's operational requirements. Consider the trade-off between cutoff frequency stability and external resistor tolerance. Evaluate power supply noise immunity relative to the application environment.

Part Context

This part belongs to the MAX29x family of switched-capacitor filters, which includes variants like the MAX291 and MAX297. These devices share similar architectural principles but differ in order and response characteristics. The MAX297 specifically offers elliptic response, distinguishing it from the Chebyshev or Butterworth responses found in other family members.

Replacement Considerations

Direct replacements include the MAX297CWE for wider temperature range or different packaging. Verify pinout compatibility before substitution. Check if alternative filter orders meet the specific attenuation requirements of the circuit design.