Application Circuit of Low Noise Op-Amp TC75S67TU for Pyroelectric Infrared Sensor Design guide
■This Design Guide (hereinafter referred to as “this guide”) describes designing pyroelectric infrared human sensors using low-noise op-amp TC75S67TU. Human sensors are widely used in security lights, toilets, entrance lights, automatic faucets, etc. Infrared rays, ultrasonic waves, and visible light are used to detect human locations. This guide describes examples of applications of low-noise op-amp TC75S67TU using human sensors that use pyroelectric elements to detect infrared rays.
●Introduction
■Op-amps are still used in a variety of situations even today in the digital age, and a particularly important application is their use in a variety of sensors.
■There are various types of information that can be obtained from nature, such as sound and light, and there are various types of sensor elements accordingly. Generally, the output signal from a sensor element is very weak, and it is hard to handle as it is, so in most cases it is amplified and processed.
■Op-amps are used for this amplification. In addition to amplification, op-amps are used for filters and I-V conversion in various sensors, and it is not an overstatement to say that most modern electronic devices cannot be realized without an op-amp.
■Noise characteristics are important in applications with these sensors. If the op-amp itself is noisy, critical sensor signals may be masked by noise, resulting in a decrease in detection sensitivity or false detection, preventing the desired sensing performance from being attained. Therefore, the operational amplifiers used in such applications require low noise levels.
■In order to meet these requirements, To s h i b a have developed an operational amplifier TC75S67TU with a low noise level of6 nV/√Hz (@f=1 kHz, GV=40 dB, typical).
■This Design Guide describes designing pyroelectric infrared human sensors using TC75S67TU. For more information on TC75S67TU, refer to the data sheet of the link destination below.
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Low Noise Op-Amp 、 Onboard pyroelectric sensor 、 Fresnel lens 、 Onboard operational amplifier |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2020-03-18 |
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Rev.11 |
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RD160-DGUIDE-01 |
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1.4 MB |
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