Datenblatt-Suchmaschine für elektronische Bauteile |
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ISO6741 Datenblatt(PDF) 19 Page - Texas Instruments |
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ISO6741 Datenblatt(HTML) 19 Page - Texas Instruments |
19 / 35 page 8 Detailed Description 8.1 Overview The ISO674x family of devices have 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. If the ENx pin is low then the output goes to high impedance. The ISO674x devices also incorporate advanced circuit techniques to maximize the CMTI performance and minimize the radiated emissions due to 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 EN RX OUT SiO2 based Capacitive Isolation Barrier Copyright © 2016, Texas Instruments Incorporated Figure 8-1. Conceptual Block Diagram of a Digital Capacitive Isolator Figure 8-2 shows a conceptual detail of how the ON-OFF keying scheme works. TX IN RX OUT Carrier signal through isolation barrier Figure 8-2. On-Off Keying (OOK) Based Modulation Scheme www.ti.com ISO6741 SLLSFJ6 – AUGUST 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 19 Product Folder Links: ISO6741 |
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