ISO7763FDWR.B datasheet(27/52 Pages) TI2

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7 Detailed Description

7.1 Overview

The ISO776x family of devices uses 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. The

ISO776x family of devices also incorporates advanced circuit techniques to maximize the CMTI performance

and minimize the radiated emissions because of 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. Figure 7-2 shows a conceptual detail of how the ON-OFF keying scheme works.

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

TX IN

RX OUT

Carrier signal through

isolation barrier

Figure 7-2. ON-OFF Keying (OOK) Based Modulation Scheme

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ISO7760, ISO7761, ISO7762, ISO7763

SLLSER1H – AUGUST 2017 – REVISED JANUARY 2024

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Product Folder Links: ISO7760 ISO7761 ISO7762 ISO7763

ISO7763FDWR.B Datasheet(PDF) 27 Page - Texas Instruments

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