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Hi,
my customer observed when 3.3V is applied to IN+ through 240kOhm, the voltage on IN+ is only 0.6V, when V+=0V.
Why IN+ is so low? Are there any diodes from IN+ to GND and V+ inside the device?
Will the device break at this situation?
Howard
There are protection diodes to V+ and V- on the inputs. So if you ground V+ as you described, you will see a conducting diode if you apply a voltage to the input.
Since the current is being limited by a 240k resistor, no damage to the device will occur.
Chuck
Chuck,
thank you.
So what's the current rating of the diodes inside? I should use this value to calculate the resistor to limit the current.
Howard
You should limit to less than 5mA when the input voltage is going to exceed V+ or V-.
Sorry for not mentioning that in the previous response.
Chuck