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I am going to design 4 mA to 20 mA transmitter using XTR106... can u help me for design... this is new to me....I want to use whetstone bridge with XTR106 from datasheet i get to know bridge impedance is very important for desiging 4 mA to 20 20 mA transmitter circuit.I am using whetstone bridge in that one arm resistance get vary from 100 E to 230 E.
1)I didn't clear term bridge impedance
2)Also not understand Vtrim term
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In reply to kai klaas69:
Thank you so much for quick reply now i understand bridge impedance term but still i have doubt about one term in datasheet that is B is the non linearity relative to Vfs. Also in application I will use one arm resistance of whetstone bridge vary from 100E to 230E and i want change in current 4 to 20 mA linearly.
In reply to Amruta Bhujbal67:
In reply to Dennis Goeke:
still i am not clear with wheastone bridge combination.I have use bridge in which one arm resistance change from 100e to 230e..i dont understand from datasheet how much differntial volatge need to xtr106 and in xtr115 part article i had read that bridge current should be less than 1A so this will be applicable for xtr106 also..also one more thing i wont use preamplifier so what should be the differential output from wheastone bridge..In datasheet mentation common mode voltage should be 1.1v to 3.5v..for my application can i take it as when wheastone bridge balance output of wheastone bridge should be minimum 1.1v.
I dont clear all above thing..please give me suggestion
if you want to take the XTR106, then you can make it in this way:
The two additional 1k2 resistors limit the bridge current to about 1mA. With the connection between pin13 and pin14 the 2.5V reference voltage is chosen. Pin1, pin11 and pin12 are configured for no linearity correction. To make the output current swing from 4mA to 20mA when one of the bridge resistors shifts from 100R to 230R a calculated gain setting resistor of RG = 60.72496R is needed.
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