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VTL5C1 Datasheet(PDF) 44 Page - PerkinElmer Optoelectronics |
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VTL5C1 Datasheet(HTML) 44 Page - PerkinElmer Optoelectronics |
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44 / 76 page  39 Characteristics of Analog Optical Isolators Capacitance The equivalent circuit for the output photocell is a resistor in parallel with the capacitance. The capacitance arises from the topside metallization of the electrodes which form a coplanar capacitor. The value of this capacitance is largely determined by the size of the ceramic base. For lower capacitance, a smaller cell is needed. The capacitance is so small (3.0 pF, typical on catalog AOIs) that it is negligible in most applications. However, there are applications such as wideband or high frequency amplifiers in which the capacitance needs to be considered. At 4.5 MHz, the video baseband frequency, the photocell capacitive reactance is only 12 kilohms. If the phase shift of the signal is to be kept below 10°, the highest useful cell resistance is only 2.0 kilohms. At high AOI input drive, where the cell is drive below 1.0 kilohm, the capacitance can increase additionally from 2 to 10 times, possibly due to distributed effects. Summary Analog Optical Isolators have many unique features, such as: 1. High input-to-output isolation. 2. True resistance element output. 3. Wide dynamic range (low “on” resistance/high “off” resistance). 4. Low drive current. 5. Low distortion. These features are primarily dependent on which input element and output element photoconductive material is used in the Vactrol AOI. Thus, there is a wide variety of Vactrols to choose from for your application. |
Similar Part No. - VTL5C1 |
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Similar Description - VTL5C1 |
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