CIRCUIT060054

Low-pass Sallen-Key filter circuit

CIRCUIT060054

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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

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Support software

Simulation for Single-supply, Second Order, Sallen-Key Lowpass Filter Circuit SBOC598.TSC (61KB)

Supported products & hardware

Supported products & hardware

General-purpose op amps
TLV316 Single, 5.5-V, 10-MHz, RRIO operational amplifier TLV9062 Dual, 5.5-V, 10-MHz operational amplifier
Precision op amps (Vos<1mV)
OPA325 Low noise (10nV/rtHz), wide bandwidth (10MHz), low power (0.65mA), zero crossover op amp

Technical documentation

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Type Title Date
* Circuit design Single-supply, 2nd-order, Sallen-Key low-pass filter circuit Jun. 28, 2021
* Application note Active Low-Pass Filter Design (Rev. B) Sep. 13, 2002
Application note AN-31 Amplifier Circuit Collection (Rev. D) Oct. 21, 2020
Application note FilterPro™ MFB and Sallen-Key Low-Pass Filter Design Program User Guide (Rev. C) Feb. 25, 2011
Application note Basic Introduction to Filters - Active, Passive, and Switched-Cap (Rev. A) Apr. 21, 2010
Application note Analysis of the Sallen-Key Architecture (Rev. B) Sep. 13, 2002

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