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HCPL-4100500 参数 Datasheet PDF下载

HCPL-4100500图片预览
型号: HCPL-4100500
PDF下载: 下载PDF文件 查看货源
内容描述: 光耦合20 mA电流环路发射器 [Optically Coupled 20 mA Current Loop Transmitter]
分类和应用:
文件页数/大小: 12 页 / 233 K
品牌: AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
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11  
As Figure 15 illustrates, the  
combination of Agilent current  
loop optocouplers, HCPL-4100  
transmitter and HCPL-4200  
receiver, can be used at the  
isolated end of current loops.  
Cross talk and common mode  
coupling are greatly reduced  
when optical isolation is imple-  
mented at the same end of both  
loops, as shown. Full duplex data  
rate is limited by the non-isolated  
active transmitter current loop.  
Comments mentioned under  
simplex configuration apply to  
the full duplex case. Consult the  
HCPL-4200 receiver optocoupler  
data sheet for specified device  
performance.  
This configuration allows the use  
of two wires to carry data back  
and forth between local and  
remote units. However, protocol  
must be used to determine which  
specific transmitter can operate  
at any given time. Maximum data  
rate for a half duplex system is  
limited by the loop current  
ground potential differences and  
reduction of power supply  
requirements. With this combina-  
tion of HCPL-4100/-4200 opto-  
couplers, specific current loop  
noise immunity is provided, i.e.,  
minimum SPACE state current  
noise immunity is 1 mA, MARK  
state noise immunity is 8 mA.  
charging time. These considera-  
tions were explained in the  
Simplex configuration section.  
Voltage compliance of the current  
source must be of an adequate  
level for operating all units in the  
loop while not exceeding 27 V dc,  
the maximum breakdown voltage  
for the HCPL-4100. Note that the  
HCPL-4100 transmitter will allow  
output loop current to conduct  
when input VCC power is off.  
Figures 16a and 16b illustrate  
half duplex application for the  
combination of HCPL-4100/-4200  
optocouplers. The unique and  
complementary designs of the  
HCPL-4100 transmitter and  
HCPL-4200 receiver optocoup-  
lers provide many designed-in  
benefits. For example, total  
optical isolation at one end of the  
current loop is easily accom-  
plished, which results in  
Consult the HCPL-4200 receiver  
optocoupler data sheet for  
specified device performance.  
Half Duplex  
The half duplex configuration,  
whether point to point or multi-  
drop, gives non-simultaneous  
bidirectional data flow from  
transmitters to transmitters  
shown in Figures 16a and 16b.  
For more information about the  
HCPL-4100/-4200 optocouplers,  
consult Application Note 1018.  
substantial removal of common  
mode influences, elimination of  
Figure 15. Full Duplex Point to Point Current Loop System Configuration.