REPLACING TRADITIONAL OPTOCOUPLERS WITH Si87XX DIGITAL ISOLATORS
■Introduction
●Optocouplers are a decades-old technology widely used for signal isolation, typically providing safety isolation, signal level shifting, and ground loop mitigation. They are commonly used in a wide range of end applications, including data communication circuits, switch mode power systems, measurement and test systems, and isolated data acquisition systems. Optocouplers have several weaknesses, including parametric instability with temperature and device aging, significant internal parasitic couplings, long propagation delay times, narrow operating temperature ranges, and relatively low reliability. Optocouplers have been the “go-to” isolation device of choice for the past 30+ years because they were the only integrated solutions to the problem of signal isolation. Today's advanced CMOS signal isolation products offer better timing performance, higher reliability, and lower power consumption compared to optocouplers and are capturing sockets traditionally held by optocouplers. However, converting to CMOS isolation devices has, most often, required circuit changes and PCB modifications that cost money and create design risks, until now.
●The Si87xx family can be used as a pin-compatible optocoupler upgrade in existing systems or as a design-in component for new product designs. Package and pin compatibility allow the Si87xx to replace optocouplers without PCB modifications, with substantial gains in device performance and reliability. Device operation is simple: the Si87xx output is held low when anode current is above the turn-on current threshold and pulled high by an internal or external pull-up resistor when anode current is below the turn-off current threshold. (For more information about current thresholds and hysteresis values, see the Si87xx data sheet.)
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Technical Documentation |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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8/12 |
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Rev. 0.1 |
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AN729 |
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1.6 MB |
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