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Part Number: XTR106
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): 80kNZero signal: -0.0009 mV / VCharacteristic 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?
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In reply to kai klaas69:
In reply to Amir Poursadegh:
I think because of sensor's zero signal
I measured the voltage between pin 5 and pin 2 of Xtr106
yes it's 1.0147 mV/V
just add P1 and R7:
Or use a scheme like that, to decrease the adjustment range:
Have these additional components well shielded and use low pass filtering at the inputs of OPA2277 as shown in figure 6 of datasheet of XTR106.
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