Optocoupler
Optocoupler
Designers Guide About This Designers Guide
Agilent Technologies
optocouplers can be used in an
array of isolation applications
ranging from power supply and
motor control circuits to data
communication and digital logic
interface circuits.
To help you choose and design
with Agilent Technologies
isolation components, this
Designers Guide contains
popular application circuits and
recommended Agilent
optocouplers.
This handbook begins with a
selection guide followed by
sections discussing critical
optocoupler design parameters
such as Insulation and Withstand
Voltage, Regulatory Agency
Safety Standards, Common-Mode
Transient Rejection, Product Life
and light emitting diode (LED)
aging. The rest of the guide
consists of application circuits.
Each application circuit is
accompanied by:
1. A brief description.
2. Highlights of circuit
performance.
3. Circuit benefits.
4. A list of alternative Agilent
parts indicating comparably
performing products available
in varying package styles for
maximum design flexibility.
How to Use This Guide
Several indexes are included to
help locate applications and
products.
The table of contents lists all
the applications by their
general description.
Selection Guides in the form of
tables contain basic product
specifications which allow you
to quickly select the products
most suitable for your
applications.
Data sheets for products
recommended in this guide
can be found on the Agilent
Technologies web site at
www.agilent.com/semiconductors,
or they may be ordered from your
local Agilent representative.
How to Order
To order any component in this
guide or additional applications
information, call your authorized
Agilent distributor nearest you.
Although product information
and illustrations in this guide
were current at the time it was
approved for printing, Agilent
Technologies, in a continuing
effort to offer excellent products
at a fair value, reserves the right
to change specifications, designs,
and models without notice. Table of Contents
Optocoupler Selection Guide ...............................................................................................
1
15 MBd Logic Gate Optocoupler ................................................................................................... 2
1 MBd Transistor Output Optocoupler ........................................................................................ 2
100 KBd Darlington Transistor Output Optocoupler ................................................................. 2
20 MBd Digital Logic Gate Optocoupler ...................................................................................... 3
10 MBd Digital Logic Gate Optocoupler ...................................................................................... 3
8 MBd Digital Logic Gate Optocoupler ........................................................................................ 4
5 MBd Digital Logic Gate Optocoupler ........................................................................................ 4
1 MBd Digital Transistor Output Optocoupler ............................................................................ 5
100 KBd Darlington Transistor Output Optocoupler ................................................................. 5
Integrated Gate Drive Optocoupler .............................................................................................. 6
Miniature Analog Isolation Amplifiers ......................................................................................... 6
Optocouplers with Integrated Functions ..................................................................................... 7
Hermetic and Hi-Rel Optocouplers ......................................................................................
9
For Military, Space, Life Critical and High Reliability Applications ........................................ 9
Screening per MIL-PRF-38534 ..................................................................................................... 10
Quality Conformance Inspection ................................................................................................ 10
Design Considerations ........................................................................................................
13
Insulation and Regulation of Optically Coupled Isolation Devices ....................................... 13
Common-Mode Transient Rejection ........................................................................................... 17
LED Degradation Over Time ....................................................................................................... 22
Guidelines for Printed Circuit Board Assembly and Layout ................................................... 25
Digital Optoisolators: An Overview ................................................................................ 26
Digital Logic Interface/Level Shifting Applications ................................................... 28
TTL Interface with Series LED Drive ........................................................................... 28
Level Shifting/TTL Interface with Shunt LED Drive .................................................. 29
Low Power 8 MBd CMOS Interface .............................................................................. 30
25 MBd CMOS Interface ................................................................................................ 31
Low Power 100 kBd CMOS Interface ............................................................................ 32
Isolated 3 V Logic Interface/Battery Operated Applications ....................................... 33
Data Communication Applications ................................................................................. 34
Isolated RS-232C/E Interface ........................................................................................ 35
Isolated 3.3 V RS-232 Interface ..................................................................................... 35
Isolated RS-485 Bus Interface ....................................................................................... 36
Isolated Device Net/CAN Communication Interface ................................................... 37 Isolated 4 - 20 mA Analog Current Loop Transmitter/Receiver ................................. 38
Isolated 20 mA Current Loop Interface ........................................................................ 39
Multidrop Line Receiver ................................................................................................. 40
Isolated Balanced Line Receiver - Circuit No. 1 ........................................................... 41
Isolated Balanced Line Receiver - Circuit No. 2 ........................................................... 42
Isolated Tri-State Line Driver ....................................................................................... 43
Isolated Unbalanced Line Receiver ............................................................................... 44
PROFIBUS/RS-422 1.5 MB/s ......................................................................................... 45
Isolated PROFIBUS/RS-485 12 MB/s Communication Application ........................... 46
Telecommunications Applications .................................................................................. 47
Telephone Ring Detection .............................................................................................. 47
ISDN Interface ................................................................................................................ 48
Analog Applications ............................................................................................................ 49
High Speed Isolation Amplifier ..................................................................................... 50
Precision Isolation Amplifier for Unipolar Signals ...................................................... 51
Isolation Amplifier for Bipolar Signals - Circuit No. 1 ................................................ 52
Isolation Amplifier for Bipolar Signals - Circuit No. 2 ................................................ 53
AC-Coupled Isolation Amplifier .................................................................................... 54
Isolated Video Interface ................................................................................................. 55
Motor Control Applications .............................................................................................. 56
Inverter Design Using Gate Drive and Current Sense Optocouplers ......................... 56
Isolated Gate Driver for IGBT/MOSFET ...................................................................... 61
Dual Channel Isolated Gate Driver for IGBT/MOSFET ............................................. 62
Isolated Gate Driver for IGBT/MOSFET with Desaturation Protection .................... 63
Isolated Interface for Intelligent Power Module Gate Drive ....................................... 64
Low Cost Isolated Phase Current Sensing with Analog Output ................................. 65
Isolated A/D Converter for Phase Current Sensing ..................................................... 66
Low Cost Isolated Phase Current Sensing
with Analog Output/Over Current Detection .......................................................... 67
Isolated Inverter Rail Voltage Sensing using an Isolation Amplifier ......................... 68
Isolated