I need to add gain and a DC offset to Teensy 3.1 analog output. I want to use an inverting opamp to accomplish this, non-inverting opamp setup makes gain and offset interdependent and I want to keep things clean. So the question is - can I connect the analog out pin to inverting opamp input safely? All schematics that I've seen connect the out pin to a non-inverting opamp. In such a configuration the opamp input pin draws minimum or no current, and is electrically isolated from anything else. However in an inverting configuration the opamp input pin is connected to the gain resistor network, and basically anything that's connected afterwards (e.g. an inverting voltage adder).
Right now I'm buffering the analog out pin with a (non-inverting) voltage follower, before the gain/offset opamp. And I use yet another opamp to invert the signal back to normal. So that's 3 opamps for a pretty simple function. Is there a way to reduce that number?
Right now I'm buffering the analog out pin with a (non-inverting) voltage follower, before the gain/offset opamp. And I use yet another opamp to invert the signal back to normal. So that's 3 opamps for a pretty simple function. Is there a way to reduce that number?