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HCPL-7800 参数 Datasheet PDF下载

HCPL-7800图片预览
型号: HCPL-7800
PDF下载: 下载PDF文件 查看货源
内容描述: 高CMR隔离放大器 [High CMR Isolation Amplifiers]
分类和应用: 隔离放大器放大器电路光电二极管分离技术隔离技术
文件页数/大小: 18 页 / 375 K
品牌: AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
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conflicting considerations,  
therefore, must be weighed  
against each other in selecting an  
appropriate sense resistor for a  
particular application. To  
maintain circuit accuracy, it is  
recommended that the sense  
resistor and the isolation amplifier  
circuit be located as close as  
possible to one another. Although  
it is possible to buy current-  
sensing resistors from established  
vendors (e.g., the LVR-1, -3 and  
-5 resistors from Dale), it is also  
possible to make a sense resistor  
using a short piece of wire or  
even a trace on a PC board.  
Figures 30 and 31 illustrate the  
response of the overall isolation  
amplifier circuit shown in Figure  
26. Figure 30 shows the response  
of the circuit to a ± 200 mV 20  
kHz sine wave input and Figure  
31 the response of the circuit to a  
± 200 mV 20 kHz square wave  
input. Both figures demonstrate  
the fast, well-behaved response of  
the HCPL-7800.  
the time scale is different from  
the previous figures). The first  
wave form is the output of the  
application circuit with the filter  
capacitors removed to show the  
actual response of the isolation  
amplifier. The second wave form  
is the response of the same circuit  
with the capacitors installed. The  
recovery time and overshoot are  
relatively independent of the  
amplitude and polarity of the  
overdrive signal, as well as its  
duration.  
Figure 32 shows how quickly the  
isolation amplifier recovers from  
an overdrive condition generated  
by a 2 kHz square wave swinging  
between 0 and 500 mV (note that  
For more information, refer to  
Application Note 1059.  
VOLTAGE  
CLOCK  
VOLTAGE  
REGULATOR  
GENERATOR  
REGULATOR  
ISOLATION  
BOUNDARY  
Σ∆  
LED DRIVE  
CIRCUIT  
DETECTOR  
CIRCUIT  
DECODER  
AND D/A  
ISO-AMP  
OUTPUT  
ISO-AMP  
INPUT  
ENCODER  
FILTER  
MODULATOR  
Figure 28. HCPL-7800 Block Diagram.  
Figure 29. PC Board Trace Pattern and Loading Diagram Example.  
1-231