Maximum rating voltage on AD1 & AD2

[SilverSurfer]

Hello,

I'm a newbie with the AD2 :-)

Before to use my Analog Discovery 2 to mesure outgoing signal for power amplifiers, I would like to be sure that the Analog input 1 & Anlog Input 2 inputs are protected, and what are the maximum input voltage before damages.

 

On the specs I saw:

Input range: ±25V (±50V diff)

Input protected to: ±50V

- Is it mean that there is a protection to limite the input voltage to ±50V ?

- If yes what is the maximum voltage input before damage ±60V / ±100V / ±200V ???

 

Many thanks your help,

 

 

 

Edited November 16, 2022 by SilverSurfer
modification

[Fausto]

Hello @SilverSurfer.

The absolute maximum analog input voltage is ±50 V.  The input is only protected up to ±50 V.

Regards,

Fausto

[SilverSurfer]

Hello Fausto,

Thanks for your answer. I

'm a little bit surprise about : absolute maximum analog input voltage is ±50 V.

In the documentation it is specified maximum input voltage :

- ±25 V (with GND ref)
and

- ±50 V on differential mode.

It means that on differential mode there is no margine !??

[attila]

Hi @SilverSurfer

The scope inputs are differential but not floating! see:
https://digilent.com/reference/test-and-measurement/analog-discovery-2/hardware-design-guide#scope_input_divider_and_gain_selection

Voltages above +-50V relative to device GND can damage the device/scope inputs. The device GND is connected over USB to the computer.
To make the device floating you could use USB isolator, battery powered laptop, eventually floating laptop supply but this can be a bit risky...

[SilverSurfer]

Ha ok , understood !  :-)

 

In this case I'll put two zener (on each inputs) at 33v for exemple to protect my inputs on over voltage.

Many thanks for the information.