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| ( DataSheet : www..com ) analog optical isolators Features * High input-to-output voltage isolation * True resistance element output * Single- or dual-element outputs available * Low cost * Suitable for AC or DC use * Wide range of input-to-output characteristics * Low drive current * Low "on" resistance, high "off " resistance * Complete solid-state construction Typical Applications * DC Isolators * Feedback Elements in Automatic Gain Control Circuits * Audio Limiting and Compression * Noiseless Switching * Logic Interfacing * Remote Gain Control for Amplifiers * Photochoppers * Noiseless Potentiometers Principle of Operation Analog Optical Isolators are used in many different types of circuits and applications. Available Related Products VTL5C Series LT3011 Series LT9900 Series Datasheets available upon request Description PerkinElmer Optoelectronics has been a leading manufacturer of analog optical isolators (AOI) for over twenty years and makes a broad range of standard parts under its trademark VACTROL(R). There are many kinds of optical isolators, but the most common is the LED/phototransistor type. Other familiar types use output elements such as light-sensitive SCRs, Triacs, FETs and ICs. The major application for these silicon-based devices is to provide electrical isolation of digital lines connected between different pieces of equipment. The principle of operation is very simple. When an input current is applied to the LED, the output phototransistor turns on. The only connection between the LED and phototransistor is through light--not electricity--thus the term optical isolator. These optical isolators are primarily digital in nature with fast response times for interfacing with logic gates. Rise and fall times of a few microseconds, faster for some isolators, are typical. The AOI also uses an optical link between input and output. The input element is an LED and the output element is always a photoconductive cell or, simply a photocell. Together, the coupled pair act as an electrically variable potentiometer. Since the output element of the AOI is a resistor, the voltage applied to this output resistor may be DC and/or AC and the magnitude may be as low as zero or as high as the maximum voltage rating. Because the input will control the magnitude of a complex waveform in a proportional manner, this type of isolator is an analog-control element. AOIs may be used in the ON-OFF mode but the fastest response time is only in the millisecond range. A level-sensitive Schmitt trigger is required between the AOI and logic gates when used in digital circuits. Absolute Maximum Ratings @ 25 Maximum Temperatures Storage and Operating: Cell Power: Derate Above 30C: LED Current: Derate Above 30C: LED Reverse Breakdown Voltage: LED Forward Voltage Drop @ 20 mA: -40C to 75C 175 mW 3.9 mW/C 40 mA 0.9 mA/C 3.0 V 2.0 V (1.65 V Typ.) VTL5C8 = 2.8 V (2.2 V typ.) VTL5C9 = 2.8 V (2.2 V typ.) VTL5C10 = 2.8 V (2.2 V typ.) 2500 VRMS 5.0 pF 0.5 pF www..com Minimum Isolation Voltage @ 70% Rel. Humidity: Output Cell Capacitance: Input/Output Coupling Capacitance: 26 www.optoelectronics.perkinelmer.com www..com Optical Isolators VTL5C Series Technical Specification Part Number On Resistance Off Resistance Material Input Dark @ 10 sec. Type Current Adapted typ. min. 1 1 mA 10 mA 40 mA 1 mA 10 mA 40 mA 5 mA 40 mA 1 mA 10 mA 40 mA 1 mA 40 mA 1 mA 10 mA 40 mA 1 mA 10 mA 1 mA 10 mA 40 mA 0.4 mA 2 mA 1 mA 4 mA 16 mA 2 mA 1 mA 20 k 600 200 5.5 k 800 200 2.5 k 700 30 k 5 k 1.5 55 k 2 k 1.2 k 125 75 1.5 k 150 75 k 10 k 2 k 5 k 1.1 k 4.8 k 1.8 k 1 k 630 400 50 M Dynamic Range 100 db Cell Voltage 100 V Response Time Turn-on to 63% Turn-off (Decay) to 100 max. Final RON typ. 2.5 ms 35 ms Slope 15 VTL5C1 VTL5C2 VTL5C2/2 VTL5C3 0 0 3 3 4 4 0 7 0 1 4 1 M 1 M 10 M 10 M 400 k 400 k 100 M 1 M 10 M 50 M 400 k 24 20 20 19 18.7 8.3 16.7 5.7 8 7.3 3.8 69 db 65 db 75 db 71 db 72 db 68 db 88 db 75 db 80 db 112 db 75 db 200 V 50 V 250 V 100 V 50 V 30 V 250 V 50 V 500 V 100 V 50 V 3.5 ms 7 ms 2.5 ms 3 ms 6 ms 6 ms 3.5 ms 6 ms 4 ms 4 ms 1 ms 500 ms 150 ms 35 ms 50 ms 1.5 sec 1.5 sec 50 ms (1 M) 1 sec. (100 k) 60 ms 50 ms 1.5 sec Analog Optical Isolators-- VTL5C Series PerkinElmer Optoelectronics' line of AOIs consists of a light-tight package which houses a light source and one or more photoconductive cells. Through control of the input current or voltage applied to the AOI, the output resistance can be varied. The output resistance can be made to switch between an "on" and "off" state or made to track the input signal in an analog manner. Because a small change in input signal can cause a large change in output resistance, AOIs have been found to provide a very economical and technically superior solution for many applications. VTL5C3/2 VTL5C4 VTL5C4/2 VTL5C6 VTL5C7 VTL5C8 VTL5C9 VTL5C10 Specification Notes LED Current: Since the input has a substantially constant voltage drop, a current-limiting resistance is required. ON Resistance: Dark adapted resistance measured after 24 or more hours of no input. OFF Resistance: Measured 10 sec. after removal of the input. The ultimate resistance is many times greater than the value at 10 sec. Response Time: Ascent measured to 63% of final conductance from the application of 40 mA input. The conductance rise time to a specified value is increased at reduced input drive while the conductance decay time to a specified value is decreased. Typical matching and tracking from 0.4 to 40 mA is 25%. Measured 5 sec. after removal of the input. The ultimate resistance is many times greater than the value at 5 sec. VTL5C9 response times are based on a 2 mA input. VTL5C10 response times are based on a 10 mA input for ascent time and a 1 mA input for decay time. LT Series Technical Specification Part Number Typical Electro-Optical Characteristics R1mA R20mA typ. R01 min. R05 min. top range k k m m C -- -- 0.7-1.2 1.2-2.5 2-5 4.5-9 8-16 14-25 1 0.32 0.35 0.7 1.5 2 3.5 6 3 0.1 0.06 0.06 0.1 0.2 0.5 0.7 9 0.3 0.18 0.18 0.3 0.6 1.5 2.1 -20-+60 -20-+70 -20-+70 -20-+70 -20-+70 -20-+70 -20-+70 -20-+70 tst range C -20-+80 -20-+70 -20-+70 -20-+70 -20-+70 -20-+70 -20-+70 -20-+70 Vi min. TC 10 lux V %/K 2500 2500 1000 1000 1000 1000 1000 1000 2 0.4 0.4 0.4 0.4 0.4 0.4 0.4 Limit Values ton toff typ. Cs max. Vmax Pmax msec pF V mW 10 40 40 40 40 30 30 30 2 2 1 1 1 1 1 1 50 100 50 50 100 100 100 100 50 75 50 50 50 50 50 50 LT Series LT Series Key R1mA Output Resistance at If=1 mA R20mA Output Resistance at If=20 mA R01 Dark Resistance after 1 sec (If=0) R05 Dark Resistance after 5 sec (If=0) Top Operating Temperature Range Tst Storage Temperature Range Vi Input/Output Insulation Voltage TC Module Thermal Coefficient Ton Rise Time to 63% of final R20 Toff Decay Time to 37% of initial R20 Cs Output Capacity Vmax Operating Voltage at If=0 Pmax Output Power Dissipation at 25C msec LT3011-2 LT3011 LT9909 LT9910 LT9911 LT9912 LT9913 LT9914 10 50 40 40 50 40 35 35 All readings taken at standard light A (2854 K color temperature) after 2 hours of preillumination at 500 lux. Input/Output Coupling Capacity: 1 pF max. Reverse Voltage: 4 V max. Diode Forward Current: 25 mA max. DC www.optoelectronics.perkinelmer.com 27 |
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