Hi,
We use this device in an analog frontend to protect our ADC inputs against ESD. The connection is as follows:
Where pin 1 and 2 are connected to the analog inputs. We use this device because it has a very low leakage, and connect the GND pin to 5V to give it a range of essentially -0.5 to 10.5 V, where our analog inputs have a range of 0 to 10V. Our 5V supply can then, through a capacitor, deflect the ESD towards GND. However, when one of the inputs is connected to 0V and we connect the other to any voltage over 8V, the device starts conducting, which doesn't make sense to us. We saw the following note in the datasheet:
But we are unsure where that originates from. There is no other detail or guidance about I/O vs I/O voltage in the datasheet, and from the (simplified, I know) circuit symbol we do not expect this behavior. Is this something that you are aware of?
Best regards, Tobias
