The output voltage from AD5611 DAC is rail-to-rail, and minimum Vcc is 2.7V – therefore, the signal range is 0-2.7V. I need to attenuate this signal to let's say 0-2V range. The DAC output is very weak, so I need to use an OpAmp to buffer it. Is it a good practice to use G=<1 configuration for decreasing signal's amplitude, or is there a better way to do it?
I saw this question, but I do not think that using voltage divider would be a good idea in my case, since the DAC output is very weak, and using large resistances would introduce noise.
Best Answer
A voltage divider followed by a buffer is not a bad way to approach it. If your supply is 5V you could use something like 30K and 20K resistor divider and a voltage follower as a buffer. The output impedance of the DAC is 0.5 ohm, so 50K won't have much effect.