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ISO7221CDG4 Datasheet(PDF) 23 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) 23 Page - Texas Instruments

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ISO7221
V
CC1
V
CC2
ISO7220A, ISO7220B, ISO7220C, ISO7220M
ISO7221A, ISO7221B, ISO7221C, ISO7221M
www.ti.com
SLLS755N – JULY 2006 – REVISED SEPTEMBER 2015
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The ISO7220x and ISO7221x devices use single-ended TTL or CMOS-logic switching technology. The supply
voltage range is from 3 V (2.8 V for C-grade) to 5.5 V for both supplies, VCC1 and VCC2. When designing with
digital isolators, because of the single-ended design structure, digital isolators do not conform to any specific
interface standard and are only intended for isolating single-ended CMOS or TTL digital signal lines. The isolator
is typically placed between the data controller (that is,
μC or UART), and a data converter or a line transceiver,
regardless of the interface type or standard.
9.2 Typical Application
The ISO7221x device can be used with Texas Instruments' mixed signal micro-controller, digital-to-analog
converter, transformer driver, and voltage regulator to create an isolated 4-20 mA current loop.
Figure 19. Isolated 4 to 20 mA Current Loop
9.2.1 Design Requirements
Unlike optocouplers, which require external components to improve performance, provide bias (or limit current),
the ISO7220x and ISO7221x devices require only two external bypass capacitors to operate.
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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