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Si8220BD-A-IS Arkusz danych(PDF) 11 Page - Silicon Laboratories |
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Si8220BD-A-IS Arkusz danych(HTML) 11 Page - Silicon Laboratories |
11 / 28 page Si8220/21 Rev. 0.22 11 4. Application Information 4.1. Theory of Operation The Si8220/21 is a functional upgrade for popular opto-isolated drivers, such as the Avago HPCL-3120, HPCL- 0302, Toshiba TLP350, and others. The operation of an Si8220/21 channel is analogous to that of an opto coupler, except an RF carrier is modulated instead of light. This simple architecture provides a robust isolated data path and requires no special considerations or initialization at start-up. A simplified block diagram for the Si8220/21 is shown in Figure 5. Figure 5. Simplified Channel Diagram A channel consists of an RF Transmitter and RF Receiver separated by a semiconductor-based isolation barrier. Referring to the Transmitter, input A modulates the carrier provided by an RF oscillator using on/off keying. The Receiver contains a demodulator that decodes the input state according to its RF energy content and applies the result to output B via the output driver. This RF on/off keying scheme is superior to pulse code schemes as it provides best-in-class noise immunity, low power consumption, and better immunity to magnetic fields. See Figure 6 for more details. Figure 6. Modulation Scheme RF OSCILLATOR MODULATOR DEMODULATOR A B Semiconductor- Based Isolation Barrier Transmitter Receiver LED Emulator 0.5 to 2.5 A peak Gnd VDD Input Signal Output Signal Modulation Signal |
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