ISO7741FDW datasheet(25/52 Pages) TI

25 / 52 page

TX IN

RX OUT

Carrier signal through

isolation barrier

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

ISO7740, ISO7741, ISO7742

www.ti.com

SLLSEP4G – MARCH 2016 – REVISED FEBRUARY 2020

Product Folder Links: ISO7740 ISO7741 ISO7742

Submit Documentation Feedback

9 Detailed Description

9.1 Overview

The ISO774x family of devices 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 ISO774x 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 19, shows a functional

block diagram of a typical channel.

9.2 Functional Block Diagram

Figure 19. Conceptual Block Diagram of a Digital Capacitive Isolator

Figure 20 shows a conceptual detail of how the ON-OFF keying scheme works.

Figure 20. On-Off Keying (OOK) Based Modulation Scheme

ISO7741FDW 数据表(PDF) 25 Page - Texas Instruments

ISO7741FDW 数据表(HTML) 25 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

数据表下载