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RCV420 4-20mA 电流环路接收器的输入过载保护
消耗积分:10 |
格式:rar |
大小:27 |
2009-06-10
张虎豹
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Because of its immunity to noise, voltage drops, and line
resistance, the 4–20mA current loop has become the standard
for analog signal transmission in the process control industry.
The RCV420 is the first one-chip solution for converting
a 4–20mA signal into a precision 0–5V output. Although the
on-chip current sensing resistor is designed to tolerate moderate
overloads, it can be damaged by large overloads which
can result from short circuits in the current loop. Complete
input protection from short circuits to voltages of 50V or
more can be afforded with the addition of the relatively
simple circuitry shown in this bulletin.
resistance, the 4–20mA current loop has become the standard
for analog signal transmission in the process control industry.
The RCV420 is the first one-chip solution for converting
a 4–20mA signal into a precision 0–5V output. Although the
on-chip current sensing resistor is designed to tolerate moderate
overloads, it can be damaged by large overloads which
can result from short circuits in the current loop. Complete
input protection from short circuits to voltages of 50V or
more can be afforded with the addition of the relatively
simple circuitry shown in this bulletin.
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