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ISO6741 Datasheet(PDF) 28 Page - Texas Instruments

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Part # ISO6741
Description  ISO674x-Q1 Automotive, General-Purpose, Reinforced, Quad-Channel Digital Isolators With Robust EMC
PDF  50 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ISO6741 Datasheet(HTML) 28 Page - Texas Instruments

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7 Detailed Description
7.1 Overview
The ISO674x-Q1 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-Q1 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
7-1, shows a functional block diagram of a typical channel.
7.2 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 7-1. Conceptual Block Diagram of a Digital Capacitive Isolator
Figure 7-2 shows a conceptual detail of how the ON-OFF keying scheme works.
TX IN
RX OUT
Carrier signal through
isolation barrier
Figure 7-2. On-Off Keying (OOK) Based Modulation Scheme
ISO6740-Q1, ISO6741-Q1, ISO6742-Q1
SLLSFG4F – DECEMBER 2019 – REVISED JUNE 2024
www.ti.com
28
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Copyright © 2024 Texas Instruments Incorporated
Product Folder Links: ISO6740-Q1 ISO6741-Q1 ISO6742-Q1



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