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OP27 - Analog Devices
OP27 - Analog Devices

SECTION-4-Chapter_10_Rev1a
SECTION-4-Chapter_10_Rev1a

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5 Dynamic Characteristics I

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Time-Varying and Probabilistic Considerations: Setting Limits

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Courtesy of www.mcmaster.com
Courtesy of www.mcmaster.com

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LOC04 Basic Electrical Measurement and Error Analysis

... 5. Wire the circuit shown in the schematic diagram. When setting ranges on the DMM, the switch button must be pressed to energize the circuit. a. The ammeter (which measures electric current) should be connected in series with the battery and resistor. (This is analogous to water flowing through a h ...
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... detector goes to an op amp in an analog GSM powercontrol scheme, or to an ADC in other systems such as TDMA or discrete-time GSM power control. The MAX2205 has high-input impedance for use with high-value resistive tapping from a CDMA power amplifier. This coupling method is the lowest cost and lowe ...
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AD8139 Low Noise Rail-to-Rail Differential ADC Driver Data Sheet

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Course Description - The University of Jordan

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SA-A70-24MCC - P84501
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... same protected area. This control unit does not generate a temporal pattern signal. If the distinctive three-pulse temporal pattern Fire Alarm Evacuation (or total evacuation) in accordance with NFPA 72, 1999 Edition is required, the control unit must be used with appliances that can generate the te ...
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... data integrity is paramount. In these applications it is often desirable to use two batteries to ensure reliability. The DS1210 controller provides an internal isolation switch which allows the connection of two batteries. During battery backup operation the battery with the highest voltage is selec ...
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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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