Low-noise and long-range PIR sensor conditioner circuit
CIRCUIT060004
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Description & Features

Technical documentation

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Key Document

Description

This two stage amplifier design amplifies and filters the signal from a passive infrared (PIR) sensor. The circuit includes multiple low–pass and high–pass filters to reduce noise at the output of the circuit to be able to detect motion at long distances and reduce false triggers. This circuit can be followed by a window comparator circuit to create a digital output or connect directly to an analog–to–digital converter (ADC) input.

Features
  • Single 5V Supply 
  • Passes frequencies between 0.7Hz - 10Hz 
  • AC Gain: 90dB

Technical documentation
Application notes (5)
Title Type Size (KB) Date
PDF 971 06 Mar 2020
PDF 249 29 Feb 2020
PDF 440 24 Oct 2019
PDF 479 12 May 2017
PDF 115 06 Mar 2017
User guides (5)
Title Type Size (KB) Date
PDF 2851 19 Nov 2018
PDF 8350 16 Oct 2017
PDF 3842 28 Feb 2017
PDF 4402 15 Dec 2016
PDF 3439 25 Oct 2016
White papers (1)
Title Type Size (KB) Date
PDF 11294 18 Feb 2019
Design files (1)
Title Type Size (KB) Date
ZIP 329 05 Jul 2018

Design tools & simulation (2)

Name Part Number Tool Type
Analog engineer's calculator  ANALOG-ENGINEER-CALC  Calculation tools 
SPICE-based analog simulation program  TINA-TI  Simulation tools 

TI Devices (6)

Part Number Name Product Family
MSP430FR2310  16MHz integrated analog microcontroller with 2KB FRAM, Op-Amp, TIA, Comparator w/ DAC, 10-bit ADC  Microcontrollers (MCU) 
MSP430FR2311  16MHz integrated analog microcontroller with 3.75KB FRAM, Op-Amp, TIA, Comparator w/ DAC, 10-bit ADC  Microcontrollers (MCU) 
MSP430FR2353  24MHz 105C integrated analog microcontroller with 16KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit ADC  Microcontrollers (MCU) 
MSP430FR2355  24MHz 105C integrated analog microcontroller with 32KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit ADC  Microcontrollers (MCU) 
OPA376  Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp  Operational amplifiers (op amps) 
TLV9062  2-Channel, 10-MHz, low-noise, RRIO, CMOS op amp for cost-sensitive systems  Operational amplifiers (op amps) 

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