ISO6721 datasheet(22/54 Pages) TI

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9 Detailed Description

9.1 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 9-1, shows a functional block diagram of a typical channel.

9.2 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 9-1. Conceptual Block Diagram of a Digital Capacitive Isolator

Figure 9-2 shows a conceptual detail of how the OOK scheme works.

TX IN

RX OUT

Carrier signal through

isolation barrier

Figure 9-2. On-Off Keying (OOK) Based Modulation Scheme

ISO6720-Q1, ISO6721-Q1

SLLSFF5C – JANUARY 2020 – REVISED MARCH 2021

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