I have been asked to develop a V/I converter with a resolution of .005MA with a max of 150 MA. Is this an insane question?
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I have been asked to develop a V/I converter with a resolution of .005MA with a max of 150 MA. Is this an insane question?
Philip,
150 mega-amperes is pretty out there, I'd call it insane.
The circuit is a voltage to current source. They want 0 Milliamps to 155 Milliamps. The resolution must be .005 Milliamps.Is this realy possible. .005 MIlliamps?
Philip,
I think this is plausible, at least something pretty close to this, but you're not going to be able to use any of our DACs that are directly current output nor a DAC+XTR setup since the current output range of these devices is limited to 4-20mA applications. Your solution would have to be built around a DAC+Op-Amp+External Transistor. Unfortunately I don't have a reference design or complete error analysis on hand to provide for you at this time.
I have been using an op amp and external transistor to derive my current source. I am aprehensive of 5 microamps resoltion. What DAC would you recomend?
Can you share a schematic to see the specific details for your implementation?
I was looking at TI schematic for a 16 Bit DAC. it had a mosfet output. I have to dig through my files for the schematic.