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MAX4501/MAX4502 Low-Voltage, SPST, CMOS Analog Switches _________________General Description _____________________________Features
MAX4501/MAX4502 Low-Voltage, SPST, CMOS Analog Switches _________________General Description _____________________________Features

... logic-level signals. TTL levels can exceed +3V and violate the absolute maximum ratings, damaging the part and/or external circuits. ...
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No Slide Title

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Slide 1

ACTIONI/Q Q498 ® DC Powered DC Input Field Configurable
ACTIONI/Q Q498 ® DC Powered DC Input Field Configurable

... describes a few process control applications and how to configure the unit in order to perform the various operations. Track & Hold The Digital Input is used as the control element for Track & Hold. Short the Digital Input (Pin A6) to Digital Common (Pin A3) using an external relay or switch. The An ...
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... cutting each tape is labelled with a bar-code sticker, which is then read by the tester. The test runs on a custom test set-up including a Keithley 2000 multimeter, connected via GPIB to a PC, and a switching matrix. Each layer of the tape is connected in a test jig. The test checks line resistance ...
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... Using state-of-the-art components and SMD technology, a four-quadrant controller in double-sized Eurocard format was developed for brushless DC servomotors (AC servomotors) based on the synchronism principle. The output stage is designed as a pulse-width-modulated transistor stage. The trapezoidal o ...
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MELF Resistors - Token Components
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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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