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AMC1311BDWVR Datasheet(PDF) 20 Page - Texas Instruments |
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AMC1311BDWVR Datasheet(HTML) 20 Page - Texas Instruments |
20 / 36 page TX IN Carrier Signal Across the Isolation Barrier RX OUT TX IN Oscillator OOK Modulation Transmitter TX Signal Conditioning Envelope Detection RX Signal Conditioning Receiver RX OUT SiO2-Based Capacitive Reinforced Isolation Barrier 20 AMC1311, AMC1311B SBAS786 – DECEMBER 2017 www.ti.com Product Folder Links: AMC1311 AMC1311B Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Feature Description (continued) 8.3.2 Isolation Channel Signal Transmission The AMC1311 uses an on-off keying (OOK) modulation scheme to transmit the modulator output bitstream across the SiO2-based isolation barrier. As shown in Figure 46, the transmitter modulates the bitstream at TX IN with an internally-generated, high-frequency carrier across the isolation barrier to represent a digital one and does not send a signal to represent the digital zero. The nominal frequency of the carrier used inside the AMC1311 is 480 MHz. The receiver demodulates the signal after advanced signal conditioning and produces the output. The AMC1311 also incorporates advanced circuit techniques to maximize the CMTI performance and minimize the radiated emissions caused by the high-frequency carrier and IO buffer switching. Figure 46. Block Diagram of an Isolation Channel Figure 47 shows the concept of the OOK scheme. Figure 47. OOK-Based Modulation Scheme |
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