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ISO7521CDWR Datasheet(PDF) 11 Page - Texas Instruments

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Part # ISO7521CDWR
Description  Low-Power 5 kVRMS Dual-Channel Digital Isolators
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ISO7521CDWR Datasheet(HTML) 11 Page - Texas Instruments

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OSC
PWM
VREF
VREF
Isolation barrier
LPF
Out
DCL
0
1
S
IN
Low-frequency
channel
(DC...100 kbps)
High-frequency
channel
(100 kbps...
1 Mbps)
ISO7520C, ISO7521C
www.ti.com
SLLSE39E – JUNE 2010 – REVISED MAY 2015
8 Detailed Description
8.1 Overview
The isolator in Figure 7 is based on a capacitive isolation barrier technique. The I/O channel of the device
consists of two internal data channels, a high-frequency channel (HF) with a bandwidth from 100 kbps up to 1
Mbps, and a low-frequency channel (LF) covering the range from 100 kbps down to DC. In principle, a single-
ended input signal entering the HF-channel is split into a differential signal through the inverter gate at the input.
The following capacitor-resistor networks differentiate the signal into transients, which then are converted into
differential pulses by two comparators. The comparator outputs drive a NOR-gate flip-flop whose output feeds an
output multiplexer. A decision logic (DCL) at the driving output of the flip-flop measures the durations between
signal transients. If the duration between two consecutive transients exceeds a certain time limit, (as in the case
of a low-frequency signal), the DCL forces the output-multiplexer to switch from the high- to the low frequency
channel. Because low-frequency input signals require the internal capacitors to assume prohibitively large
values, these signals are pulse-width modulated (PWM) with the carrier frequency of an internal oscillator, thus
creating a sufficiently high frequency signal, capable of passing the capacitive barrier. As the input is modulated,
a low-pass filter (LPF) is needed to remove the high-frequency carrier from the actual data before passing it on to
the output multiplexer.
8.2 Functional Block Diagram
Figure 7. Conceptual Block Diagram of a Digital Capacitive Isolator
Copyright © 2010–2015, Texas Instruments Incorporated
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Product Folder Links: ISO7520C ISO7521C


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