I want to use the 12v and 5v power lines that I have obtained using lipo batteries by isolating them from each other.
The purpose of wanting to do this is to perform a sensitive adc operation on the 5V side. On the 12v side, I plan to drive a fan and I think it will expose the 5V line to noise.
Thank you in advance for your help.

 

Yes, you can use a 5V isolated DC-DC converter to supply your ADC.
For more details we need more information on your project.

 

Are you using the 5V as the reference as well as power? If so, using a precision reference instead might solve your problem without isolating them.

 

If you run separate ground lines for the 5V and the 12V back to the batteries (star ground), that should isolate any ground noise between them.

 

If you want to control the fan using the controller that is running the ADC, use an opto-isolator between the controller output and the fan. That way, the supplies can be completely independent.

 

The question is not at all clear. Please post a sketch of what you *want* to do, so we can comment on how to get there.

ak

 

I want to use the 12v and 5v power lines that I have obtained using lipo batteries by isolating them from each other.
The purpose of wanting to do this is to perform a sensitive adc operation on the 5V side. On the 12v side, I plan to drive a fan and I think it will expose the 5V line to noise.
Thank you in advance for your help.

If your ADC is that sensitive to power supply noise,
don't power it off a DCC .

Are you going to have a common earth on the power supplies ?
if not, is the adc powered off the same as what drives it , or is it ac coupled ?

what is the adc ?