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/etc... Amplifiers & Other Linear Forum
0 - 36 mA current Transmitter with 0 - 10 V input signal
I am trying to design a current transmitter that send out a current between 0 - 36 mA with input voltage signal between 0 - 10 V. I have looked at XTR11, but it only provides output current between 0 - 20 mA.
Andreas is correct, the XTR111 is specified for a derated output current range of 0-36mA. The effect on the linearity of the IC in this extended output range can be seen in Figure 15 of the datasheet which I've copied below.
As you can see in the figure, the nonlinearity begins to take a hit after the output current exceeds 25mA with the largest effect on the nonlinearity after the output current exceeds 35mA. Therefore with a 2 point calibration at 0.1mA and 36mA you should find that the nonlinearity is improved from the figure below.
That said, John and Neil's suggestion above regarding the use of a Howland Current Pump may still be your best option depending on your exact application's needs.
Regards,Collin WellsPrecision Linear
Regards,Collin WellsPrecision Linear Applications
There was an error in the previous post. The device I meant to refer to is the XTR111, not the XTR110.
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