Hi,
We have desigend a self powered 4-20mA transmitter. Using the DAC161S997. We used an isolated 24V loop power supply and it is working fine.
We recognised that the DAC been permenantly damaged if by any misstake you shorting the LOOP N to the GND of the DAC circuit and when it comes to industrial usage it could happen.
My quistion is how to protect it agenst that?
See the schematic please.
After a one time shorting we saw that the value of mA signal has an offset. At low error sends 4.2 mA instade of 3.375 mA
At 20 mA almost 24mA.