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AD7949: Looking for a way to measure Current/Voltage

Question asked by GIRARD on Aug 6, 2015
Latest reply on Aug 6, 2015 by GIRARD

 

Hello

 

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?

 

Thank,

Best regrads

 

 

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