I know that some circuits work with current as the signal rather than voltage. I believe its called current mode circuit. Currents matter in analogue IC design I guess that is why we like to use so many current mirrors. However, here the situation is an IC called "Precision Voltage-to-Current
Converter/Transmitter". So it converts voltage to a current. Since this is an off the shelf component, it will be used as part of a larger circuit on the PCB and not inside an IC. This brings me to this question.
What is the application of such voltage to current converter ICs (this one is marked for "precision" applications)? There are a few things mentioned under Applications on the front page. However, these listed applications are rather vague. Also, in the datasheet it shows use of filter at the output. First it shows use of simple capacitor and then use of RC filter. Now, I am wondering that since the output is current and then we are connecting RC filter which will have voltage drop, isn't that a bad thing?