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SI8035CA-B-IU Scheda tecnica(PDF) 8 Page - Silicon Laboratories |
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SI8035CA-B-IU Scheda tecnica(HTML) 8 Page - Silicon Laboratories |
8 / 23 page Si80xx 8 Rev. 1.0 2. Functional Description 2.1. Theory of Operation The Si80xx comprises a transmitter and a receiver separated by a semiconductor-based isolation barrier. The Si80xx uses a high-frequency internal oscillator on the transmitter to modulate digital input signals across the capacitive isolation barrier. On the receiver side, these signals are demodulated back to the corresponding digital output signals that are galvanically isolated from the input. This simple and elegant architecture provides a robust data path and requires no special considerations or initialization at start-up. A simplified block diagram for an Si80xx data channel is shown in Figure 4. Figure 4. Simplified Channel Diagram The transmitter consists of an input stage that latches in data from up to six asynchronous channels, followed by a serializer stage where the data is compressed into serial data packets that are then coupled across the capacitive isolation barrier. The receiver consists of a demodulator block that converts the modulated signal back into serial data packets that are then deserialized and latched to the output. A B Input Latch Input Selector Transmitter Serializer Demodulator Deserializer Receiver Si80xx High Frequency Oscillator Modulator/ Packet Encoder Output Latch Packet Decoder Clock Recovery and Demodulator |
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