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ISO7720DR.B Datasheet(PDF) 23 Page - Texas Instruments

Part # ISO7720DR.B
Description  ISO772x High-Speed, Robust EMC, Reinforced and Basic Dual-Channel Digital Isolators
PDF  51 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

ISO7720DR.B Datasheet(HTML) 23 Page - Texas Instruments

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8 Detailed Description
8.1 Overview
The ISO772x family 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 8-1, shows a functional block diagram of a typical channel.
8.2 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 8-1. Conceptual Block Diagram of a Digital Capacitive Isolator
Figure 8-2 shows a conceptual detail of how the OOK scheme works.
TX IN
RX OUT
Carrier signal through
isolation barrier
Figure 8-2. On-Off Keying (OOK) Based Modulation Scheme
www.ti.com
ISO7720, ISO7721
SLLSEP3G – NOVEMBER 2016 – REVISED MAY 2024
Copyright © 2024 Texas Instruments Incorporated
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Product Folder Links: ISO7720 ISO7721



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