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Si82391CD-IS Arkusz danych(PDF) 4 Page - Silicon Laboratories |
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Si82391CD-IS Arkusz danych(HTML) 4 Page - Silicon Laboratories |
4 / 38 page 2. System Overview The operation of an Si8239x channel is analogous to that of an optocoupler and gate driver, 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 a single Si8239x channel is shown in the following figure. Figure 2.1. 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 the following figure for more details. Figure 2.2. Modulation Scheme Si8239x Data Sheet System Overview silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 3 |
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