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Product Detailed Parameters
- Description：IC FILTER 25KHZ BUTTER 8SOIC
- Series：-
- Mfr：Analog Devices Inc./Maxim Integrated
- Package：Tape & Reel (TR),Cut Tape (CT)
- Filter Type：Butterworth, Low Pass Switched Capacitor
- Frequency - Cutoff or Center：25kHz
- Number of Filters：1
- Filter Order：8th
- Voltage - Supply：4.75V ~ 11V, ±2.375V ~ 5.5V
- Mounting Type：Surface Mount
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SOIC
- Grade：-
- Qualification：-
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Overview
The MAX291ESA+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 +4.75V to +11V supply or dual ±2.375V to ±5.5V supplies. It features an internal oscillator requiring only an external capacitor, or accepts an external clock signal. The component is housed in an 8-pin SO package and supports a clock-to-corner-frequency ratio of 100:1.
Feature Summary
- Provides maximally flat passband response characteristic of Butterworth filters
- Operates using either an internal oscillator controlled by an external capacitor or an external clock signal
- Includes an uncommitted operational amplifier for additional continuous-time filtering functions
Applications
- ADC anti-aliasing filter
- DAC post-filtering
- Noise analysis
- 50Hz/60Hz line-noise filtering
Procurement Notes
Verify that the ordering suffix 'T' corresponds to the reel packaging format specified in the manufacturer's documentation. Confirm the 'E' designation indicates the extended temperature range of -40°C to +85°C. Ensure the RoHS compliant status matches current regulatory requirements before finalizing procurement specifications.
Selection Notes
Select this component when a fixed 8th-order Butterworth lowpass response is required. Choose based on the maximum corner frequency requirement of 25kHz. Verify compatibility with available clock frequencies up to 2.5MHz. Ensure the power supply configuration aligns with the single or dual voltage operation capabilities defined in the datasheet.
Part Context
This part belongs to the MAX291/MAX292/MAX295/MAX296 family of 8th-order lowpass switched-capacitor filters. While other variants offer Bessel responses or higher frequency ranges, the MAX291 specifically delivers a Butterworth response optimized for applications requiring a maximally flat passband.
Replacement Considerations
The MAX295ESA+T serves as a functional substitute within the same family, offering identical Butterworth characteristics but supporting a higher maximum corner frequency of 50kHz.
