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Si8271DB-IS Datasheet(PDF) 6 Page - Silicon Laboratories |
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Si8271DB-IS Datasheet(HTML) 6 Page - Silicon Laboratories |
6 / 43 page The operation of an Si827x 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 Si827x channel is shown in the figure below. RF OSCILLATOR MODULATOR DEMODULATOR A B Semiconductor- Based Isolation Barrier Transmitter Receiver Dead time control 4 A peak Gnd VDD Driver Figure 2.5. 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 2.6 Modulation Scheme on page 5 for more details. Input Signal Output Signal Modulation Signal Figure 2.6. Modulation Scheme Si827x Data Sheet System Overview silabs.com | Smart. Connected. Energy-friendly. Preliminary Rev. 0.5 | 5 |
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