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    特色/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




    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: –40°C to 75°C
    •Cell Power: 175 mW
    •Derate Above 30°C: 3.9 mW/°C
    •LED Current: 40 mA
    •Derate Above 30°C: 0.9 mA/°C

    •LED Reverse Breakdown Voltage: 3.0 V


                        


                       
    LED Forward Voltage Drop @ 20 mA: 2.0 V (1.65 V Typ.)
    •5C8 = 2.8 V (2.2 V typ.)
    •5C9 = 2.8 V (2.2 V typ.)
    •5C10 = 2.8 V (2.2 V typ.)
    •Minimum Isolation Voltage @70% Rel. 

    Humidity: 2500 VRMSOutput Cell Capacitance: 5.0 pF

    •Input/Output Coupling Capacitance: 0.5 pF



    Analog Optical Isolators—5C Series

    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.

    5C9 response times are based on a 2 mA input. 5C10 response times are based on a 10 mA input for ascent time and a 1 mA input for decay time.

    Typical Applications of Analog Optical Isolators




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