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ISO6721 Scheda tecnica(PDF) 17 Page - Texas Instruments

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Il numero della parte ISO6721
Spiegazioni elettronici  ISO672x-Q1 General Purpose Reinforced and Basic Dual-Channel Digital Isolators with Robust EMC
PDF  48 Pages
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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8 Detailed Description
8.1 Overview
The ISO672x-Q1family 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
www.ti.com
ISO6720-Q1, ISO6721-Q1
SLLSFF5A – JULY 2020 – REVISED DECEMBER 2020
Copyright © 2020 Texas Instruments Incorporated
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