National Semiconductor LMF90 4th-Order Elliptic Notch Filter Specification Sheet
Summary
This fourth-order elliptic notch filter provides high-precision band-rejection functionality, making it ideal for applications requiring robust interference filtering, such as power line rejection (50/60 Hz). Utilizing internal switched-capacitor techniques, the LMF90 allows engineers to programmatically set the notch width, attenuation, and center frequency ratio without external components. The manual details comprehensive electrical characteristics, connection options, and performance specifications necessary for designers building advanced communications or test equipment that requires accurate spectral filtering.
Manual Details
| Brand | National |
|---|---|
| Pages | 22 |
| File Size | 414.87 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
What is the range of frequencies the LMF90 can filter?
The notch width ranges from 0.1 Hz (Min) up to 30 kHz (Max).
Is external support needed to program the response function?
No, the device requires no external components to define the response function; it uses switched-capacitor techniques.
What are the achievable attenuation levels?
The attenuation at f is typically 39 dB or 48 dB, and this level is selectable.
How can the center frequency be set for notch filtering?
The center frequency can be set using either an external clock signal or the on-board clock oscillator.