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ISO7221CDG4 Datasheet(PDF) 19 Page - Texas Instruments

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Part # ISO7221CDG4
Description  Dual Channel Digital Isolators
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ISO7221CDG4 Datasheet(HTML) 19 Page - Texas Instruments

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1 S
Isolation Barrier
Low J Frequency
(DC...100 kbps)
High J Frequency
(100 kbps...150 Mbps)
ISO7220A, ISO7220B, ISO7220C, ISO7220M
ISO7221A, ISO7221B, ISO7221C, ISO7221M
8 Detailed Description
8.1 Overview
The isolator in the Functional Block Diagram is based on a capacitive isolation barrier technique. The I/O channel
of the ISO7220x and ISO7221x devices consists of two internal data channels, a high-frequency channel (HF)
with a bandwidth from 100 kbps up to 150 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 via 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-frequency 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
8.2 Functional Block Diagram
Copyright © 2006–2015, Texas Instruments Incorporated
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Product Folder Links: ISO7220A ISO7220B ISO7220C ISO7220M ISO7221A ISO7221B ISO7221C ISO7221M

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