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5B39 参数 Datasheet PDF下载

5B39图片预览
型号: 5B39
PDF下载: 下载PDF文件 查看货源
内容描述: 隔离电流输出 [Isolated Current Output]
分类和应用:
文件页数/大小: 8 页 / 690 K
品牌: ADI [ ADI ]
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5B39  
GENERAL DESCRIPTION  
track-and-hold input circuit. Selected by a high Write Enable  
The 5B39 is a single-channel signal conditioning module that  
converts a high-level analog input voltage into a floating,  
isolated proportional output current of 4 to 20 mA or 0 to 20  
mA across loads from 0to 750. The module provides high  
accuracy of +0.05%, low nonlinearity of +0.02%, and the  
protection of 1500V rms isolation between output-to-input and  
output-to power supply. The input common must be held to  
within +1V of power common.  
input, the hold mode exhibits an output droop rate of 80 uA/s.  
This corresponds to a refresh interval of 25 ms for 0.01% span  
droop. On power-up, the module’s output remains at 0 mA for  
about 100 ms to allow the user to initialize the track-and-hold  
circuit.  
In applications using one DAC per channel, where the track-  
and-hold feature of the 5B39 is not used, the Write Enable input  
should be set to low by grounding it to power common, as on  
the 5B01 and 5B08 backplanes. The module current output will  
then track its input signal.  
Signal isolation by transformer coupling uses a proprietary  
modulation technique for linear, stable and reliable  
performance. A demodulator on the output side of the signal  
transformer recovers the original signal, which is then filtered  
and converted to an accurate current output by a current (V-to-  
I) converter output stage. Output protection enables the 5B39 to  
withstand accidental connection to 240V rms power lines  
without damage, while isolating computer-side circuitry. In  
addition, the 5B39 is mix-and-match and hot-swappable with  
all 5B Series modules, so can be inserted or removed from any  
socket in the same backplane without disrupting system power.  
Generating A Voltage Output Signal – The 0 to 20 mA output  
of the 5B39-04 and the 5B39-03, can produce a 0 to +10V  
output by connecting a 500conversion resistor across the  
modules’ output terminals,. This approach should be used with  
caution because the output lacks the low impedance of a true  
voltage source. This means that the tolerance and size of the  
load impedance relative to the conversion resistor can introduce  
significant error. For example, a load impedance < 500kwould  
contribute <0.1% error.  
Track-and-Hold for DAC Applications – In applications where  
a single system digital-to-analog converter (DAC) is used to  
drive a number of current output channels, the 5B39 includes a  
.
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Figure 2  
Rev. 0 | Page 2 of 8