So - I just discovered a slight problem in the design of a PCB that was just shipped to me earlier today. It has a current output (0-2ma) DAC driving a transimpedance amplifier. The transimpedance amplifier is very simple in that it is just a 10K resistor from the inverting terminal to the output of an op-amp, with the DAC output connected to the inverting terminal. However, I connected a 10V source to the non- inverting terminal of the op-amp. Being that the DAC is powered by a
3.3V source - methinks it won't work. Any way to fix this? Maybe is there such a chip as a current buffer - a chip that outputs the current going in, but can drive higher voltages?I can't believe I did this... Argh.
-Michael