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The Terms And Definitions In This Glossary Will Be
The Terms And Definitions In This Glossary Will Be

... Also called CRI. A measure of how different light sources render colors. The reference (CRI of 100) is a full spectrum source of the same color temperature as the lamp. The higher the CRI, the better the color rendering, given the color temperature of the lamp. Use fluorescent lamps with a CRI of at ...
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On-Chip Techniques for Electromagnetic Interference (EMI)
On-Chip Techniques for Electromagnetic Interference (EMI)

E2E-X5Y2-US Datasheet
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SMCJ5.0(C)A - SMCJ170(C)A
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... Advantage of Low Loss RF Capacitors Selecting low loss (ultra low ESR) chip capacitors is an important consideration for virtually all RF circuit designs. Some examples of the advantages are listed below for several application types. Extended battery life is possible when using low loss capacitors ...
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... itself requires 75mA, which leaves 25mA for excitation. Therefore, a System 570 can drive a single l2OQ bridge or three to four 35OQbridges at 2.5V For other voltages, bridge resistances, or numbers of bridges, calculate the current requirement using Ohm’s law. If the total required current (includi ...
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Power-Up 3-State (PU3S) Circuits in TI Standard Logic Devices

Product Lines
Product Lines

< 1 ... 194 195 196 197 198 199 200 201 202 ... 2207 >

Resistive opto-isolator



Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator or lamp-coupled photocell, is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically isolated from each other. The light source is usually a light-emitting diode (LED), a miniature incandescent lamp, or sometimes a neon lamp, whereas the detector is a semiconductor-based photoresistor made of cadmium selenide (CdSe) or cadmium sulfide (CdS). The source and detector are coupled through a transparent glue or through the air.Electrically, RO is a resistance controlled by the current flowing through the light source. In the dark state, the resistance typically exceeds a few MOhm; when illuminated, it decreases as the inverse of the light intensity. In contrast to the photodiode and phototransistor, the photoresistor can operate in both the AC and DC circuits and have a voltage of several hundred volts across it. The harmonic distortions of the output current by the RO are typically within 0.1% at voltages below 0.5 V.RO is the first and the slowest opto-isolator: its switching time exceeds 1 ms, and for the lamp-based models can reach hundreds of milliseconds. Parasitic capacitance limits the frequency range of the photoresistor by ultrasonic frequencies. Cadmium-based photoresistors exhibit a ""memory effect"": their resistance depends on the illumination history; it also drifts during the illumination and stabilizes within hours, or even weeks for high-sensitivity models. Heating induces irreversible degradation of ROs, whereas cooling to below −25 °C dramatically increases the response time. Therefore, ROs were mostly replaced in the 1970s by the faster and more stable photodiodes and photoresistors. ROs are still used in some sound equipment, guitar amplifiers and analog synthesizers owing to their good electrical isolation, low signal distortion and ease of circuit design.
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