ISO6741 datasheet(28/50 Pages) TI1

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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

RX OUT

SiO2 based

Capacitive

Isolation

Barrier

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

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Product Folder Links: ISO6740-Q1 ISO6741-Q1 ISO6742-Q1

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