I use DAC8760 for design 4-20 mA output, and max load is 500 ohm. It have good accuracy and precision ,but after a few day current output is going to be wrong. Current output should be 12 mA at 500 ohm but the real output is too much less than 12 mA, some time it is going to 7 mA. Then I check current output again with Multi meter and on load 500 ohm, the result Current output is good. So I think It can't drive a current output with 500 ohm, then I test it with load 100 ohm, and 250 ohm the result is same as 500 ohm.
I fix my control board by replace with new DAC8760 in the same PCB, It is going to be good. Is DAC8760 broken? Why it is broken? How to prevent this problem?