I have a DAC output that ranges from 0 to 5v, and it's referenced to a power supply that has -15v, 0v, and +15v outputs.
I need to expand my DAC output from 0v->5v to -5v->5v in a way that is still stable at up to 25khz, and doesn't reduce the resolution by much more than half.
Is an opamp circuit the proper way to go about this, or should I be looking at something else?
MarkT:
What resolution is the DAC? How accurate and/or precise do you want to be?
The DAC is a 12-bit 4096 resolution unit.
Given that I’m shooting for 30,000 updates per second to these DACs, I’m starting to think i2c might not be the best option- opinions?
trilithide:
Yup, trying to build a 30kpps projector!
The DAC is a 12-bit 4096 resolution unit.
Given that I’m shooting for 30,000 updates per second to these DACs, I’m starting to think i2c might not be the best option- opinions?
So half the resolution is 1 part in 8000? ie 0.6mV at the output of the DAC - so an opamp would need
to have input offset of 0.5mV or better for that goal, ie a precision opamp of some kind.
What source impedance is the galvo unit?
[ sorry, that should read input impedance ]