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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ISO6720 датащи(PDF) 24 Page - Texas Instruments |
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ISO6720 датащи(HTML) 24 Page - Texas Instruments |
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24 / 49 page  8 Detailed Description 8.1 Overview The ISO672xB family of devices has an ON-OFF keying (OOK) modulation scheme to transmit the digital data across a silicon dioxide based isolation barrier. The transmitter sends a high frequency carrier across the barrier to represent one digital state and sends no signal to represent the other digital state. The receiver demodulates the signal after advanced signal conditioning and produces the output through a buffer stage. These devices also incorporate advanced circuit techniques to maximize the CMTI performance and minimize the radiated emissions due the high frequency carrier and IO buffer switching. The conceptual block diagram of a digital capacitive isolator, Figure 8-1, shows a functional block diagram of a typical channel. 8.2 Functional Block Diagram TX IN Oscillator OOK Modulation Transmitter Emissions Reduction Techniques TX Signal Conditioning Envelope Detection RX Signal Conditioning Receiver RX OUT SiO2 based Capacitive Isolation Barrier Figure 8-1. Conceptual Block Diagram of a Digital Capacitive Isolator Figure 8-2 shows a conceptual detail of how the OOK scheme works. TX IN RX OUT Carrier signal through isolation barrier Figure 8-2. On-Off Keying (OOK) Based Modulation Scheme ISO6720, ISO6721, ISO6721R SLLSFJ0D – JANUARY 2020 – REVISED SEPTEMBER 2021 www.ti.com 24 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: ISO6720 ISO6721 ISO6721R |
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