For a project, we need to have 8 Analog inputs.
These inputs must have the following characteristics:
- In Voltage mode: measure an input voltage from 0 to 10V. Have an input impedance > 300Kohms.
- In Current mode: measure an input Current from 0mA to 20mA via a 100ohm load resistance.
Board inputs must be protected against over Voltage/current.
We can accept a way to switch input from/to Current/Voltage mode.
Available supply is 3.3V and 5V.
Have you an application note or a schematic which can help me to reach my constraint above?