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CIRCUIT060054
Low-pass Sallen-Key filter circuit
CIRCUIT060054
Overview
The Butterworth Sallen-Key low-pass filter is a second-order active filter. Vref provides a DC offset to accommodate for single-supply applications. A Sallen-Key filter is usually preferred when small Q factor is desired, noise rejection is prioritized and when a non-inverting gain of the filter stage is required. The Butterworth topology provides a maximally flat gain in the pass band.
Features
- Input: Vi = -2.45V to 2.45 V
- Output: Vo = 0.05 V to 4.95 V
- Supply:
- Vcc = 5 V
- Vee = 0 V
- Gain: 1 V/V
- Cutoff frequency: 10 kHz
- Vref = 2.5 V
Get started
- Read the circuit design
- Read the application report
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Downloads
Supported products & hardware
General-purpose op amps
Precision op amps (Vos<1mV)
Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Application note | Active Low-Pass Filter Design (Rev. D) | PDF | HTML | 02 Feb 2023 |
| * | Circuit design | Single-supply, 2nd-order, Sallen-Key low-pass filter circuit | PDF | HTML | 28 Jun 2021 |
| Application note | AN-31 Amplifier Circuit Collection (Rev. D) | 21 Oct 2020 | ||
| Application note | FilterPro™ MFB and Sallen-Key Low-Pass Filter Design Program User Guide (Rev. C) | 25 Feb 2011 | ||
| Application note | Basic Introduction to Filters - Active, Passive, and Switched-Cap (Rev. A) | 21 Apr 2010 | ||
| Application note | Analysis of the Sallen-Key Architecture (Rev. B) | 13 Sep 2002 |
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