I use an ADG467 to protect input ADC channel (ADS1247). I need to read low current ~30uA with an accurate ADS1247 ADC through shunt resistance. It is important that the leackage current is very low to don't impact the accuracy. That the reason I use ADG467 protector in place of diode againt overvoltage. Unfortunately the typical value don't limit the output at the good level (Vss+1.5V Vdd-1.5 Vtyp for Output open circuit conditions). ADC input current is about 1nA.
My question is: Have you any experience about the ADG467 repeatability. Do I have to expect no negligeable output limitation varation between ADG467 series ?
My result with VDD = 4,16V VSS= -4.10V => ADG467 output range = -2.89V to 3.22V (in place of-2.6V to 2.66V)
Thanks for your help