Other Parts Discussed in Thread: OPA2277
Hi
I have to design a 4-20 mA transmitter circuit for a load cell with about 520ohm impedance.
I used XTR106 and circuit that mentioned in figure 5 of XTR106 datasheet.
so I used the circuit like figure 5 of datasheet
I think the input range of XTR106 have to be between 1.1 and 3.5V.
but in this example I think the characteristic value is about 4.0817 mV/V so the input full scale voltage is 0.245*4.0817*50=50 mV
so the full scale current is Io=(50*40/125)+4=20
in this example the input voltage of XTR106 is betwwen 0 and 50 mV is it OK?
for my application I have a load pin sensor with
Rated load (FS): 80kN
Zero signal: -0.0009 mV / V
Characteristic value: 1.0147 mV / V
so I used this circuit for it
but for this circuit I have less than 4 mA at the first!
is my design ok? How I can solve my problem?