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AD8277/AD8276 overvoltage/max input current

Question asked by gerard on Apr 9, 2014
Latest reply on Apr 16, 2014 by gerard

Hi,

 

We are using a AD8277 Unity-Gain Difference Amplifier and noticed that some parts spontaneous  break down which results in a short on their power pins.  I suspect this happens when a ungrounded device is connected to the inputs. This device floats due the leak in the power supply at 50Hz 70Vpeak.

 

I would think the internal 40k resistors in combination with the ESD diodes would protect the inputs against this voltage. Could it be that the maximum input current is reached?

 

 

Gerard

 

Supply voltage AD8277 dual 12V.

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