Yes, I understood, this is very strange idea from newbie, but whatever... I want to make sawtooth waveform generator, based on capacitor charging by constant current. With specified frequency, capacitor will be short-circuited, producing sawtooth on the output. So, voltage controlled constant current source is needed. Yes, I understood that there is more convenient solutions, like Howland current pump. But! I have found XTR115 - current loop transmitter.
As I understood, this IC could supply constant current in range 0.25-25mA depending on input voltage Vin. Is this extremely silly idea to use this IC as voltage controlled current source?